化学
化学反应、化学计量、分子结构与元素性质。
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linolenic acid is a polyunsaturated fatty acid with 18 carbons and thre…
\(C_{18}H_{30}O_2\)
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use the references to access important values if needed for this questi…
\(F^{-}(aq)+H_2O(l) ightleftharpoons HF(aq)+OH^{-}(aq)\)
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identify the unsaturated fatty acid. select the correct answer below: h…
The first two options (assuming they are the ones with \(C = C\) double bonds in their carbon - chain structures) are unsaturated fatty acids.
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identify the trans form of an unsaturated fatty acid. select the correc…
The second option (the one with the \(C = C\) double bond where the hydrogen atoms around the double bond are in a trans - like arrangement).
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identify the saturated fatty acid. select the correct answer below: hoo…
First option ( \( \text{HOOC}-\text{CH}_2-\text{CH}_2-\text{CH}_2-\text{CH}_2-\text{CH}_2-\text{CH}_2-\text{CH}_2-\text{CH}_2-\text{CH}_2-\text{CH}_2-\text{CH}_2-\text{CH}_2-\text…
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scoring: your score will be based on the number of correct matches minu…
- ammonium perchlorate: The pH will be less than 7. - sodium nitrite: The pH will be greater than 7. - calcium iodide: The pH will be approximately equal to 7. - ammonium iodide: …
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which of the following types of lipids have a glycerol group? select th…
both glycerophospholipids and oils
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the value of ( k_{a} ) for formic acid is ( 1.80\times10^{-4} ). what i…
\(5.56\times 10^{-11}\)
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use the references to access important values if needed for this questi…
\(8.21\)
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use the references to access important values if needed for this questi…
\(4.61\times 10^{-4}\)
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in atomic theory, new substances are formed when the atoms of other sub…
C. The amount of matter is conserved.
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the diagram below shows the reaction of oxygen gas and hydrogen gas to …
A. The total mass of the system stays the same
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in the chemical reaction below, calcium metal and water react to form c…
B. the total mass of the products will be equal to the original mass of the reactants.
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iron reacts with sulfur to form iron sulfide. if 60 grams of iron react…
A. 30 grams
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which of the following best describes the number of atoms for each elem…
A. There are 6 carbon atoms, 12 hydrogen atoms and 18 oxygen atoms on the reactant side and 6 carbon atoms, 12 hydrogen atoms and 18 oxygen atoms on the product side.
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in a chemical reaction, atoms are rearranged to form new molecules. how…
D. It will stay the same no matter how the atoms are rearranged.
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cellular respiration describes the process that living cells use to rel…
B. The mass of the reactants is the same as the mass of the products.
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in a chemical reaction, the total mass of the reactants is 10.0 grams. …
B. exactly 10.0 grams
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the diagram below shows the reaction of nitrogen with hydrogen to produ…
D. The mass of the nitrogen atoms in the reactants is equal to the mass of the nitrogen atoms in the products.
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using this method, it is possible to solve many problems by using to an…
1. \(10800\) 2. \(0.0035\) 3. \(12.1\) 4. \(90\) 5. \(11388\) 6. \(1.806\times10^{24}\) 7. \(4.32\) 8. \(112\) 9. \(4.46\)
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metrics and measurement in the chemistry classroom and lab, the metric …
1. \(0.36\space dL\) 2. \(0.95\space kg\) 3. \(27.5\space cm\) 4. \(1\space kL\) 5. \(1\space L\) 6. \(4.5\space g\) 7. \(250\space mm\) 8. \(0.5\space dag\) 9. \(7.5\space cm\) 1…
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the acetate ion is the conjugate base of the weak acid acetic acid. the…
\(CH_3COO^-+H_2O ightleftharpoons CH_3COOH + OH^-\)
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3 qualifiez les forces dattraction subies par les particules de matière…
Fluides liquides: Forces d'attraction assez fortes. Fluides gazeux: Forces d'attraction très faibles.
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use the references to access important values if needed for this questi…
(a) \(I^-\), (b) \(Cu^{+}\), (c) \(Se^{2-}\), (d) \(Ba^{2+}\)
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what is causing this wave? water molecules in the tank are displaced by…
Water molecules in the tank are displaced by the falling drops.
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what is causing this wave? water molecules in the tank are displaced by…
Water molecules in the tank are displaced by the falling drops.
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write ground - state electron configurations for the ions $co^{2 + }$, …
| ion | electron configuration | paramagnetic | |----|----|----| | \(Be^{+}\) | \(1s^{2}2s^{1}\) (or \([He]2s^{1}\)) | \(Be^{+}<Co^{2+}\) | | \(P^{3 -}\) | \(1s^{2}2s^{2}2p^{6}3s^…
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write ground - state electron configurations for the ions s^-, ca^2+, s…
| ion | electron configuration | paramagnetic | |----|----|----| | \(Fe^{2+}\) | \([Ar]3d^{6}\) | ✓ | | \(S^{2 -}\) | \([Ar]\) | ✗ | | \(Ca^{2+}\) | \([Ar]\) | ✗ | | \(S^-\) | \([…
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which of the following combinations of quantum numbers are allowed for …
\(n = 4,l = 0,m = 0,m_s=-\frac{1}{2}\) and \(n = 3,l = 1,m = 0,m_s=-\frac{1}{2}\)
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calculate the percent ionization of a 0.536 m solution of phenol (a wea…
\(1.37\times 10^{-3}\%\)
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connect the name of the scientist to their contribution to the modern m…
- Bohr: Electrons in orbits by energy levels - Rutherford: Initial concept of nucleus - Thomson: Initial concept of electrons - Schrödinger: Electrons in clouds - Chadwick: Initia…
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use the references to access important values if needed for this questi…
\(3.2\times 10^{-4}\)
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use the references to access important values if needed for this questi…
\(5.19\)
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use the references to access important values if needed for this questi…
\(0.0111\)
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use the references to access important values if needed for this questi…
\(0.0117\)
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in the laboratory, a general chemistry student measured the ph of a 0.4…
\(3.26\times 10^{-8}\)
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of a pencil on the 50 yard line. where is most of the mass in an atom l…
- For "Where is most of the mass in an atom located?": Nucleus - For "What makes up most of the volume of an atom?": Empty space
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in the laboratory, a general chemistry student measured the ph of a 0.4…
\(1.07\times 10^{-10}\)
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12. living oceans: food web is the law of conservation of mass is illus…
NO
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write the balanced chemical equation for each synthesis, decomposition,…
a) \(Ca(HCO_3)_2(s)\xrightarrow{\Delta}CaCO_3(s)+CO_2(g)+H_2O(g)\) b) \(6Li(s)+N_2(g) = 2Li_3N(s)\) c) \(2C_6H_{14}(l)+19O_2(g)=12CO_2(g)+14H_2O(g)\)
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for the question(s) that follow, consider the following equation. 2mg +…
0.40 mole. ---
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given the following equation, what is the correct form of the conversio…
\(\frac{2\text{ moles of }Fe_{2}O_{3}}{3\text{ moles of }O_{2}}\) (the third option: \(\frac{2\text{ moles of }Fe_{2}O_{3}}{3\text{ moles of }O_{2}}\))
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for the question(s) that follow, consider the following equation. 2mg +…
2.0 moles.
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autoionization occurs when two solvent molecules collide and a proton i…
\(CH_3OH+CH_3OH ightleftharpoons CH_3O^- + CH_3OH_2^+\)
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autoionization occurs when two solvent molecules collide and a proton i…
\(H_2O + H_2O ightleftharpoons H_3O^+ + OH^-\)
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use the references to access important values $k_{a}$ for nitrous acid,…
\(NO_2^-\)
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13 balance each of the following chemical equations. a) ____ c(s) + ___…
a) \(2C_{(s)}+4H_{2(g)} + O_{2(g)}\to2CH_3OH_{(g)}\) b) \(2C_{(s)}+6Cl_{2(g)}+2H_{2(g)}\to2CHCl_{3(g)}\) c) \(2HgO_{(s)}\to2Hg_{(l)}+O_{2(g)}\) d) \(4Li_{(s)}+O_{2(g)}\to2Li_2O_{(…
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phase diagram use the diagram to answer each question. 1. which section…
- Solid phase: A - Liquid phase: B - Gas phase: C - Triple point: d - Critical point: e - Normal melting point: \(65^{\circ}C\) - Normal boiling point: \(100^{\circ}C\) - Impossib…
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some substances can change directly from a solid to a gas, research the…
The process is called sublimation. An example is dry ice (solid carbon dioxide).
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9. wet clothes are put on a washing line to dry. the water in the cloth…
a) Evaporation b) Condensation c) On a sunny day, the temperature is higher. Water particles in the clothes have more kinetic energy, move faster, and escape more easily as water …
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9. wet clothes are put on a washing line to dry. the water in the cloth…
a) Evaporation b) Condensation c) Particles gain more energy, move faster, and escape more easily. 10. Process: Sublimation; Example: Dry - ice (solid \(CO_2\))
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8. the diagram below shows a bottle of fizzy drink. label the state of …
a) Gas b) Solid c) Liquid d) Gas
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q.22. the table shows the melting points and boiling points for differe…
| Substance | State at Room Temperature | |--|--| | Water | Liquid | | Oxygen | Gas | | Iron | Solid | | Sulfuric acid | Liquid | | Magnesium | Solid | | Nitrogen | Gas |
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q.14. when the particles are ____, they gain energy and move faster. a)…
- Q.14: a) heated - Q.15: c) Gas - Q.16: b) Pencil - Q.17: c) Condensation - Q.18: d) Freezing - Q.19: a) Sublimation - Q.20: c) gas - Q.21: b) liquid - Q.22: - Water: liquid - Ox…
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q.5. particles are closest together in the ______ phase. a) solid b) li…
- Q.5: a) solid - Q.6: b) Container Y - Q.7: a) Solid - Q.8: d) The particles in a solid have more energy than the particles in a liquid. - Q.9: c) Gas - Q.10: b) apple, banana - …
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q.4. which of the following is a matter? a) heat c) water b) sound d) l…
C. Water
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q.3. fill the table to describe the characteristics of the states of ma…
| States of Matter | Do they have definite volume? | Do they have definite shape? | Do they compress? | |---|---|---|---| | Vapor (Gas) | No (in open - air, yes in a closed contai…
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states of matter (solid, liquid, gas) - worksheet q.1. use the words in…
Solid, Liquid, Gas
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states of matter (solid, liquid, gas) - worksheet q.1. use the words in…
1. T 2. T 3. F 4. T 5. F
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the density of a noble gas is 2.71 g/l at 3.00 atm and 0°c. identify th…
Neon ($\ce{Ne}$)
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sodium azide (nan₃) is used in some automobile air bags. the impact of …
$$ V = 35.4\ \text{L} $$
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a mixture of gases contains 3.85 moles of neon (ne), 0.92 moles of argo…
The partial pressure of Ne is \(1.31\) atm, the partial pressure of Ar is \(0.31\) atm, and the partial pressure of Xe is \(0.88\) atm.
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a mixture of gases contains 3.85 moles of neon (ne), 0.92 moles of argo…
- The partial pressure of \(Ne\) is \(1.31\space atm\) - The partial pressure of \(Ar\) is \(0.31\space atm\) - The partial pressure of \(Xe\) is \(0.88\space atm\)
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question 5 5. how many atoms are in 2 moles of gold? 1.2×10²⁴ 1.8×10²⁴ …
1.2 x 10²⁴
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4. sample a: 1 mole of carbon dioxide (co₂) molecules sample b: 1 mole …
All the samples contain \(6.02\times 10^{23}\) particles.
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question 3 1 pts 3. what is the mass of 4.76 mol of na3po4? 333.02 g 14…
780.64 g
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question 2 2. how many moles are in 200 g of silver (ag)? 21,000 mol 0.…
1.85 mol
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question 1 1. what is the molar mass of potassium carbonate (k₂co₃)? 10…
138 g
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the gas in a 250.0 ml piston experiences a change in pressure from 1.25…
\(125\)
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based on the bond energies for the reaction below, what is the enthalpy…
\(-1222\space kJ\)
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at a constant temperature, which of the gases will have the highest ave…
E. All the gases will have the same average kinetic energy.
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a single bond, compared to a double bond. answer: a is longer. b is str…
A. is longer.
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for a constant temperature, which will have the greatest average speed?…
A. Ne
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the bond dissociation energy to break 4 c - c bond(s) in 1 mole of hexa…
\(1384\)
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what gas law states that pressure and temperature are directly proporti…
C. Gay - Lussac's Law (Amonton's Law)
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calculate the enthalpy of combustion (kj/mol) of methyl linoleate (c₁₉h…
$-11689.4\ \text{kJ/mol}$
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for which one of the following is the enthalpy of the reaction the same…
A. \(2Fe(s)+\frac{3}{2}O_{2}(g)\to Fe_{2}O_{3}(s)\)
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sro(s)+co₂(g)→srco₃(s) δh°=-234kj/mol 2sr(s)+o₂(g)→2sro(s) δh°=-1184kj/…
\(2440\space kJ/mol\)
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using the equations $\\ce{sr(s) + c(s) + \\frac{3}{2}o_{2}(g) \\to srco…
\(864\space kJ/mol\)
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using the equations sro(s)+co₂(g)→srco₃(s) δh°= 2sr(s)+o₂(g)→2sro(s) δh…
\(2200\)
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using the provided table, determine the molar enthalpy (in kj/mol) for …
\(172.5\)
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in the following reaction, what quantity in moles of ch₃oh is required …
\(3.3\space mol\)
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in the following reaction, what quantity in moles of $ch_{3}oh$ is requ…
\(5.8\space mol\)
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if a reaction is exothermic, what is true of its reverse reaction? answ…
A. $\Delta H>0$
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in examples where the volume of a system is under constant pressure, wh…
D. heat absorbed or released by the system
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what quantity of heat (in kj) will be absorbed by a 39.5 g piece of alu…
$1.62$
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an exothermic reaction causes the surroundings to answer: a warm up. b …
A. warm up.
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if 801 j of heat is available, what is the mass in grams of iron (speci…
$18.3\ g$ (rounded to three significant figures)
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an unknown solid is added to water in a calorimeter. the temperature of…
E. Both A and D.
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a 99.1 g piece of copper (specific heat 0.380 j/g·°c) is heated and the…
\(88.9^{\circ}C\)
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part e: what is the ph of a 7.0 x 10-3 m aqueous solution of ca(oh)2 at…
\(12.15\)
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which artery carries blood beneath the clavicle to the shoulder? caroti…
Question 84: abdominal aorta Question 85: ischemia
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the cause of idiopathic cardiomyopathy is: heredity an infection unknow…
- First question: unknown - Second question: blocked blood flow
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the chemical formulae of some acids are listed in the first column of t…
| acid | strong or weak? | species present at \(10^{-6}\ mol/L\) or greater when dissolved in water | |---|---|---| | \(HClO_3\) | strong | \(H^{+}\), \(ClO_3^{-}\) | | \(H_3PO_4\…
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an analytical chemist weighs out 0.345 g of an unknown diprotic acid in…
\(166\space g/mol\)
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an analytical chemist weighs out 0.111 g of an unknown monoprotic acid …
\(94.1\space g/mol\)
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a chemistry student weighs out 0.232 g of phosphoric acid (h₃po₄), a tr…
\(41.8\space mL\)
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a chemistry student weighs out 0.0849 g of formic acid (hcho₂) into a 2…
\(26.4\space mL\)
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gaseous butane $(ch_{3}(ch_{2})_{2}ch_{3})$ will react with gaseous oxy…
\(15.8\space g\)
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gaseous methane (ch₄) will react with gaseous oxygen (o₂) to produce ga…
\(6.4\space g\)