1. Methane, CH4 (C = 12.01 g/mol; H = 1.008 g/mol)
A. 0.482 mol Au B. 2.9 x 1023 Au atoms
2. Sodium Nitrate, NaNO3 (Na = 23.0 g/mol; N = 14.0 g/mol; O = 16.0 g/mol)
A. 0.482 mol Au B. 2.9 x 1023 Au atoms
3. What is the percent by mass of oxygen in MgO?
A. 20% B. 40%
4. What is the percent composition by mass of magnesium in the compound MgSO4 (gram formula mass = 120 g/mol)?
A. 40% B. 20%
5. In which compound is the percent composition by mass of Cl equal to 42%?
A. HClO3 (gram formula mass = 84 g/mol) B. HClO4 (gram formula mass = 100 g/mol
A. 0.482 mol Au B. 2.9 x 1023 Au atoms
2. Sodium Nitrate, NaNO3 (Na = 23.0 g/mol; N = 14.0 g/mol; O = 16.0 g/mol)
A. 0.482 mol Au B. 2.9 x 1023 Au atoms
3. What is the percent by mass of oxygen in MgO?
A. 20% B. 40%
4. What is the percent composition by mass of magnesium in the compound MgSO4 (gram formula mass = 120 g/mol)?
A. 40% B. 20%
5. In which compound is the percent composition by mass of Cl equal to 42%?
A. HClO3 (gram formula mass = 84 g/mol) B. HClO4 (gram formula mass = 100 g/mol
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Answer:
1. molar mass= 16.04g/mol
2. 85g/mol
3. B
4. B
5. A
1. B
2. B
3. B
4. B
5. A