Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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5. what information is provided by the magnitude of the equilibrium con…
c. Whether products or reactants are favoured
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4 which of the following is an example of a heterogeneous equilibrium s…
d. $\ce{Cu^{2+}(aq) + 2OH^{-}(aq) ightleftharpoons Cu(OH)_{2}(s)}$
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3. when is the system at equilibrium said to be dynamic? a. just prior …
c. When it reaches a equilibrium that will shift in response to changes
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2. which can be used as a macroscopic (visible) property to monitor a r…
e. All of the above
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1. which best describes the process of equilibrium? a. a reaction with …
d. A reaction in which the rates of the forward and reverse processes are equal
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the rhyme pattern that occurs at the ends of lines in poetry is called …
a rhyme scheme.
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read the poem \monets waterlilies\ by robert hayden. today as the news …
- There is no rhyme scheme. - The lines are unequal in length.
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rate the molar enthalpies of vaporization of the following substances i…
A. CH₄ < C₂H₆ < C₃H₈
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what phase changes will take place when water is subjected to increasin…
deposition and melting
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complete the table below by writing the symbols for the cation and anio…
| Ionic Compound | Cation | Anion | | --- | --- | --- | | \( \text{NaCl} \) | \( \text{Na}^+ \) | \( \text{Cl}^- \) | | \( \text{CuCl}_2 \) | \( \text{Cu}^{2+} \) | \( \text{Cl}^-…
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complete the table below by writing the symbols for the cation and anio…
The completed table is as shown above with cations and anions: - \( \text{MnCl}_2 \): Cation \( \boldsymbol{\text{Mn}^{2+}} \), Anion \( \boldsymbol{\text{Cl}^-} \) - \( \text{Mn}…
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an atom can become an ion by losing electrons to or gaining electrons f…
Sodium \(\boldsymbol{\text{loses}}\) an electron, and chlorine \(\boldsymbol{\text{gains}}\) an electron. So the sodium atom becomes a \(\boldsymbol{\text{positively}}\) charged i…
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part c: true (t) or false (f) 1. changing the size and shapes of pieces…
To solve these true - false questions, we analyze each one based on the definitions of physical and chemical changes. A physical change is a change in the form or appearance of a …
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something looks, but havent made a new substance, a physical change (p)…
To solve this, we determine if each change is physical (P, no new substance) or chemical (C, new substance): ### 1. An ice cube in the sun - Ice melts to water (same substance, st…
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physical change 1. a change in size, shape, or state 2. no new substanc…
P ### 2. Ag (Silver) tarnishes. Step: Tarnishing forms silver sulfide (new substance).
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physical and chemical properties and changes name physical property 1. …
### Part A (Identifying Physical (P) or Chemical (C) Changes) #### 1. An ice cube is placed in the sun... - **Explanation**: Ice melts to water (state change) and water evaporates…
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2 how does the passage compare satellites to instruments like telescope…
B. Satellites see larger areas of Earth at one time and can see into space better than telescopes.
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atom reading and questions. answer the questions on a separate sheet of…
Atoms are the basic units of matter that make up all the space in the universe. The idea of atoms was first suggested in 440 B.C., and they are composed of protons, neutrons, and …
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a charged object, like an ion, can exert an electric force on another o…
The electric force causes them to attract.
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4. ____koh → ____k₂o + ____h₂o 5. ____mg + ____h₂o → ____mg(oh)₂ + ____…
4. $2\text{KOH} ightarrow \text{K}_2\text{O} + \text{H}_2\text{O}$ 5. $\text{Mg} + 2\text{H}_2\text{O} ightarrow \text{Mg(OH)}_2 + \text{H}_2$ 6. $\text{K}_3\text{PO}_4 + 3\text{H…
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fill in the blank 6 points volume is the amount of space an object take…
Pregunta 2: liters Pregunta 3: grams
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8. how many kilograms of calcium are there in 173 pounds of calcium? (1…
78.5 kg ### Question 9
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counting atoms and calculating molar mass 12. aluminum sulfate - al₂(so…
Since the problem is about counting atoms and calculating molar mass, let's take an example, say problem 12: Aluminum sulfate - $\ce{Al2(SO4)3}$. ### Step-by-Step Explanation for …
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possible points: 4 using the graph below, identify two liquids—one with…
- Highest density liquid: Mercury (density = 13.60 g/mL), determined by its being the tallest bar on the graph. - Lowest density liquid: Liquid Hydrogen (density = 0.07 g/mL), det…
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name: endothermic/exothermic reactions exit ticket date: students were …
- Correct student: Student B - Reaction type: Endothermic - Support: The energy graph shows products have higher potential energy than reactants, with $\Delta H > 0$. This means t…
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name: ______ period: ______ counting atoms and calculating molar mass p…
### Part 1: Counting Atoms #### For $\boldsymbol{\ce{NaOH}}$: ## Step 1: Identify elements and counts - $\ce{Na}$: 1 atom (no subscript, so 1) - $\ce{O}$: 1 atom (subscript 1 in $…
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what makes an acid unique and how are acids named? why? a variety of ac…
For HBr: Cation is $\boldsymbol{H_3O^+}$, Anion is $\boldsymbol{Br^-}$; For HF: Cation is $\boldsymbol{H_3O^+}$, Anion is $\boldsymbol{F^-}$ (or the filled table as above).
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why study earth science? to increase biodiversity to predict severe wea…
○ to predict severe weather events
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question 29 of 49 other structure. resonance structure 1: h₃c - n = c =…
### Curved arrows on Resonance Structure 1: 1. A curved arrow originating from one of the lone pairs on the oxygen atom, pointing towards the carbon-oxygen bond (to form a double …
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you will next be reading from the truth about drugs booklet. before you…
The beliefs and activities that are common to members of a group
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calculate the number of moles in each of the following masses: 6. how m…
Approximately $28.0\ g$ (or $28\ g$) of sodium. ### Problem 7:
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consider the incomplete structure shown. draw an alternative lewis (res…
The resonance structure is: ``` H | H - C ≡ N - H | H ``` With a -1 formal charge on the carbon atom and a +1 formal charge on the nitrogen atom; the nitrogen atom has one unshare…
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question 31 of 49 structure 3: draw the structure with a positively cha…
The positively charged carbon structure is: ``` H₃C | H₃C-N-C⁺(O-CH₃) | (removed O-CH₃) ``` Or visually, a central carbon with three bonds: one to N(CH₃)₂, one to O-CH₃, and no fo…
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8. 8.76 g of sodium sulfide is added to 350 ml of 0.250 mol/l lead(ii) …
20.9 g
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8. 8.76 g of sodium sulfide is added to 350 ml of 0.250 mol/l lead(ii) …
$\ce{Al(NO3)3 + 3NaOH -> Al(OH)3(s) + 3NaNO3}$ ### Part (b)
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forever chemicals diagram analyze it: 1. name one consumer product that…
1. One consumer product is non-stick cookware (e.g., Teflon-coated pans). PFAS are used to create a heat-stable, non-stick surface that repels food and resists damage. 2. PFAS per…
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6. artificial sources of water include a. aquifers. b. aqueducts. c. sp…
b. aqueducts ### Question 7
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a solution is 29.36% m/v. what is the mass of dissolved solid in 125 ml…
36.7 g --- ### Second Question
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a student dissolved 0.515 mol of magnesium chloride in enough water to …
1. 2.29 mol/L 2. 0.75 mg
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seawater has ph of 8.0. what is the hydrogen ion concentration? 2 x 10^…
1. B. $1 \times 10^{-8}\ \text{mol/L}$ 2. D. $4.58\ \text{mol/L}$ 3. A. $500\ \text{mL}$
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concentration of iodide ions? 0.25 mol/l calcium iodide or 0.45 mol/l p…
1. calcium iodide 2. 12 3. a concentrated weak acid
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lesson 13.1: true or false name_______________ class_____________ date_…
False ### Question 2
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ground state vs excited state electrons background neils bohr was the s…
### 1) Completed Table: | Electron Configuration | Identity (count electrons) | Ground/Excited | |------------------------|----------------------------|----------------| | 1) 2-8-…
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12) what volume would be occupied by 4.8 g of oxygen gas at 0.50 atm an…
12) $\approx 10.0\ \text{L}$ 13) $2.00\ \text{M}$ 14) $\approx 8.56\ \text{L}$ 15) $2\text{NaOH(aq)} + \text{MgCl}_2\text{(aq)} ightarrow \text{Mg(OH)}_2\text{(s)} + 2\text{NaCl(a…
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which type(s) of molecule(s) are non - polar solvents more likely to be…
non-polar molecules
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introduction: chemical equations show how compounds and elements react …
1. B. Decomposition 2. E. Combustion 3. A. Synthesis 4. D. Double Replacement 5. C. Single Replacement ### Part 2: Balancing and Classifying #### A. \(AgNO_3 + KCl ightarrow AgCl …
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what is the difference between a strong acid and a weak acid? a strong …
B. A strong acid completely dissociates in water. C. A strong acid completely ionizes in water. --- ### Second Question:
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solutions with which of the following molar concentrations are consider…
1. 0.1 mol/L or less 2. saturated
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which of the following is the correct dissociation reaction for calcium…
1. $\text{Ca(OH)}2(\text{s}) ightarrow \text{Ca}2+(\text{aq}) + 2\text{OH}-(\text{aq})$ 2. ionization 3. partially reacts with water to form $\text{OH}-(\text{aq})$
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in what section of an msds would you find the recommended fire extingui…
B. Section 5 (assuming the options are labeled as A. Section 6, B. Section 5, C. Section 1, D. Section 2)
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activity a: balancing equations\ run the gizmo: first\ - check that the…
$\boldsymbol{2}\ \ce{H2 + 1\ O2 -> 2\ H2O}$ ### 2. Balancing $\boldsymbol{\ce{Al + HCl -> AlCl3 + H2}}$
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dilution of an acid solution lowers the ph. * true false which piece of…
1. False 2. volumetric flask 3. gasoline
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adding water to a solution increases the solutions concentration. true …
1. False 2. False 3. concentration of H+(aq) ions 4. False
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which of the following is not a solution? * oxygen in water sand in wat…
1. sand in water 2. True 3. negative oxygen ends
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what section of an msds provides the phone number(s) for contacting the…
C. Section 1 (Note: Assuming the options are labeled as A. Section 6, B. Section 2, C. Section 1, D. Section 5. If the original option labels differ, adjust accordingly, but based…
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3. how many atoms of iron are in 72.5 grams? 4. how many formula units …
Approximately $7.82\times10^{23}$ atoms of iron. ### Problem 4: How many formula units of $\text{Al(NO}_3\text{)}_3$ are in 0.360 moles?
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part a what can you conclude about the most precious metal? the most pr…
B. The idea of what is the most precious metal has changed over time.
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molar conversion practice 1 mole of sodium atoms = ______ atoms nole of…
\( 1.8 \times 10^{24} \) atoms (or \( 1.8066 \times 10^{24} \) atoms) #### 2. In 27.0 grams of lithium, how many atoms are there?
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3. how many grams are in of 4.50 moles of barium sulfide? 4. how many f…
\( 762.3 \, \text{grams} \) (or \( 762 \, \text{g} \) if rounded to three significant figures) ### Problem 4: How many formula units are there in 5.39 moles of silver chloride?
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select three pieces of evidence in the passage that suggest that count …
- "Stay here, and worry not. I'll return at dawn. I will bring back a gift of peace." - "The count stared in horror at the sword and said, 'Was anyone hurt?'" - "He softened and s…
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unbalanced force: forces are unequal, causing some change in the motion…
To solve this matching problem for Unit 3: The Atom, we analyze each definition and match it with the correct term from the word bank: ### 1. "Anything that has mass and takes up …
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2. how many moles are in 3.90 × 10²⁸ molecules of methane (ch₄)?
Approximately \( \boldsymbol{6.48\times 10^{4}} \) moles (or 64800 moles)
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which box represents a homogeneous mixture? a b c d e f a b c d e f
A. Box A
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question 4 (2 points) saved which box represents a compound in the gase…
E. (The box E represents a compound in the gaseous state as it contains molecules of a compound (different atoms bonded) with particles spread out, indicating the gaseous state.)
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for questions s8 - 65 --- fill in the shaded blanks for the elements in…
To solve these fill - in - the - blank questions related to elements (atomic structure), we use the following concepts: - For a neutral atom, the number of protons = the number of…
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for questions 58-65 --- fill in the shaded blanks for the elements in t…
a. 9 ### Question 67
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review 2011 chemistry final semester 1 name pg 3 1. define the followin…
\( 2.5 \times 10^{-4} \) ### Question 20:
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quiz 1 - chemical reactions balance the equation: □ga + □h₂so₄ → □ga₂(s…
Balanced equation: $\boldsymbol{2}\ce{Ga} + \boldsymbol{3}\ce{H2SO4} ightarrow \boldsymbol{1}\ce{Ga2(SO4)3} + \boldsymbol{3}\ce{H2}$ Type of reaction: Single - replacement reactio…
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the following structure is an anion with three possible resonance contr…
### Resonance Structure 1 (Completed): - N: 2 nonbonding electrons (1 lone pair), formal charge = 0 - O: 4 nonbonding electrons (2 lone pairs), formal charge = 0 - S: 6 nonbonding…
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the diameter of a water molecule is 0.000000000033 m. which is the best…
\( 3 \times 10^{-11} \) m (the option with \( 3 \times 10^{-11} \) m)
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4. read the sentence from paragraph 8. \picture a village enclosure in …
B. a protected or separate area ### Question 5
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2c₈h₁₈ + 25o₂ → 16co₂ + 18h₂o the combustion reaction can theoretically…
59.375 (or rounded as needed, e.g., 59.4)
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$$2\\ce{c8h18} + 25\\ce{o2} \ ightarrow 16\\ce{co2} + 18\\ce{h2o}$$ in …
\( 1.6 \)
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li₃n + 3h₂o → nh₃ + 3lioh 12 g of li₃n react with excess h₂o. what is t…
\( \approx 24.8 \) (or more accurately \( 24.7 - 24.8 \) g, but the precise calculation gives approximately 24.8 g)
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zn + 2hbr → znbr₂ + h₂ 32.7 g of solid zinc was dropped into excess hyd…
112
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zn + s → zns 17 g of zn and excess s react in a sealed container. what …
25.3 (approximate value, depending on molar mass precision)
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2mg + o₂ → 2mgo 25 g of mg and excess o₂ react in a sealed container. w…
$\approx 41.4$
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mno₂ + 4hcl → mncl₂ + cl₂ + 2h₂o 9.52 g mno₂ reacts with 16.54 g hcl ac…
\( 7.77 \) (or rounded appropriately, e.g., \( 7.76 - 7.78 \) depending on precision)
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3fecl₂ + 2na₃po₄ → fe₃(po₄)₂ + 6nacl if 23 g of iron(ii) chloride react…
\( \approx 21 \) (or more precisely \( \approx 21.2 \)) g NaCl
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mg + 2hcl → mgcl₂ + h₂ the theoretical yield for hydrogen gas was 2.57 …
17.1 (or 17.12, depending on rounding)
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the following measurements were made to determine the density of a mate…
Low
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the following measurements were made to determine the density of a mate…
Low
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convert the condensed formula hccch(ch₃)₂ into its expanded structure. …
``` H | H-C≡C-C-CH₃ | | H CH₃ ``` Expanded structure with all hydrogens drawn explicitly: ``` H | H - C ≡ C - C - H | | H | CH₃ | H | H - C - H | H ``` Or in linear explicit form:…
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2c₄h₁₀ + 13o₂ → 8co₂ + 10h₂o the reaction uses up 16.8 g c₄h₁₀ from the…
\( 3.2 \)
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2c₄h₁₀ + 13o₂ → 8co₂ + 10h₂o what mass of c₄h₁₀ is used when 60.0 g o₂ …
\( \approx 16.9 \)
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2c₄h₁₀ + 13o₂ → 8co₂ + 10h₂o you found that o₂ is the limiting reactant…
\( 26.0 \) (or approximately \( 25.9 \) - \( 26.0 \) depending on rounding steps)
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2c₄h₁₀ + 13o₂ → 8co₂ + 10h₂o 20.0 g c₄h₁₀ burns in 60.0 g o₂. which is …
2
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3ba(no₃)₂ + 2na₃po₄ → ba₃(po₄)₂ + 6nano₃ the reaction is initiated with…
\( 1.22 \)
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3ba(no₃)₂ + 2na₃po₄ → ba₃(po₄)₂ + 6nano₃ what mass of na₃po₄ is used up…
\( 8.78 \)
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3ba(no₃)₂ + 2na₃po₄ → ba₃(po₄)₂ + 6nano₃ ba(no₃)₂ is the limiting react…
\( \boxed{16.1} \)
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3ba(no₃)₂ + 2na₃po₄ → ba₃(po₄)₂ + 6nano₃ 21.0 g ba(no₃)₂ reacts with 10…
1
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3fecl₂ + 2na₃po₄ → fe₃(po₄)₂ + 6nacl 20. g na₃po₄ are used during the r…
$21\ \text{g}$
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3fecl₂ + 2na₃po₄ → fe₃(po₄)₂ + 6nacl what mass of na₃po₄ is used when 2…
\(\approx19.8\) (or more precisely \(\approx19.84\))
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3fecl₂ + 2na₃po₄ → fe₃(po₄)₂ + 6nacl you found that fecl₂ is the limiti…
\( \approx 22 \) (or more precisely \( \approx 21.6 \))
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3fecl₂ + 2na₃po₄ → fe₃(po₄)₂ + 6nacl if 23 g fecl₂ reacts with 41 g na₃…
1
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c₃h₈(g) + 5o₂(g) → 3co₂(g) + 4h₂o(g) the reaction began with 65.0 g c₃h…
\( 23.7 \)
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c₃h₈(g) + 5o₂(g) → 3co₂(g) + 4h₂o(g) knowing that o₂ is limiting, you w…
\( 41.3 \) (or more precise calculation: \( \frac{105}{22.4\times5}\times44.094=\frac{105\times44.094}{112}\approx\frac{4630.87}{112}\approx41.35\approx41.4 \) depending on precis…
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c₃h₈(g) + 5o₂(g) → 3co₂(g) + 4h₂o(g) you determine o₂ is the limiting r…
3.75
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c₃h₈(g) + 5o₂(g) → 3co₂(g) + 4h₂o(g) the combustion of c₃h₈ occurs at s…
2
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2agno₃ + cacl₂ → 2agcl + ca(no₃)₂ the reaction began with 30.00 g cacl₂…
$3.87$