Question

quiz - atoms, moles, molecules, mass and volume conversions
there are three mole equalities. they are:
1 mol = 6.02×10²³ particles
1 mol = molar mass in g (periodic table)
1 mol = 22.4 l for a gas at stp
part 1: select best answer for each question (1 point each)

1. a single proton has what electrical charge?

a. no charge b. positive charge
c. negative charge d. either a positive or negative charge

1. which particles have approximately the same size and mass as each other?

a. neutrons and electrons b. electrons and protons
c. protons and neutrons d. none - all are different in size and mass

1. which two particles would be attracted to each other?

a. electrons and neutrons b. electrons and protons
c. protons and neutrons d. all particles are attracted to each other

1. the three basic components of an atom are:

a. protons, neutrons, and ions b. protons, neutrons, and electrons
c. protons, neutrinos, and ions d. protium, deuterium, and tritium

1. an element is determined by the number of:

a. atoms b. electrons c. neutrons d. protons

1. the nucleus of an atom consists of:

a. electrons b. neutrons
c. protons and neutrons d. protons, neutrons, and electrons
part 2: use your periodic table to solve each problem
for each problem calculate the g/mol for each of the following chemicals (1 point each)

1. hc₂h₃o₂________________
2. c₆h₁₂o₆________________
3. c₁₂h₁₉clo________________

Explanation:

Step1: Calculate molar mass of \(HC_2H_3O_2\)

• Molar mass of \(H\) is \(1\space g/mol\), \(C\) is \(12\space g/mol\), \(O\) is \(16\space g/mol\)
• \(HC_2H_3O_2\) has \(4\) \(H\) atoms (\(4\times1\)), \(2\) \(C\) atoms (\(2\times12\)), \(2\) \(O\) atoms (\(2\times16\))
• \(M=(4\times1)+(2\times12)+(2\times16)=4 + 24+32 = 60\space g/mol\)

Step2: Calculate molar mass of \(C_6H_{12}O_6\)

• \(C_6H_{12}O_6\) has \(6\) \(C\) atoms (\(6\times12\)), \(12\) \(H\) atoms (\(12\times1\)), \(6\) \(O\) atoms (\(6\times 16\))
• \(M=(6\times12)+(12\times1)+(6\times16)=72 + 12+96=180\space g/mol\)

Step3: Calculate molar mass of \(C_{12}H_{19}ClO\)

• \(C_{12}H_{19}ClO\) has \(12\) \(C\) atoms (\(12\times12\)), \(19\) \(H\) atoms (\(19\times1\)), \(1\) \(Cl\) atom (\(35.5\)), \(1\) \(O\) atom (\(16\))
• \(M=(12\times12)+(19\times1)+35.5 + 16=144+19 + 35.5+16=214.5\space g/mol\)

Answer:

1. \(60\space g/mol\)
2. \(180\space g/mol\)
3. \(214.5\space g/mol\)