General Chemistry, Quiz 7

1.00 mol of calcium hydroxide has how many oxygen atoms? The formula for calcium hydroxide is Ca(OH)2.

1.20 × 10^24

Find the mass of 3.00 mol of acetic acid, C2H4O2.

180 g

What is the percent composition (by mass) of water?

11.2% H, 88.8% O

What is the molar mass of copper(II) sulfate, CuSO4?

159.62 g

What is the molar mass, to three significant figures, of sodium phosphate, Na3PO4?

164 g

Match the compound formula with the correct molar mass.

2.016 g - hydrogen gas 84.01 g - NaHCO3 41.99 g - sodium fluoride 110.98 g - CaCl2 44.01 g - carbon dioxide 153.8 g - carbon tetrachloride 134.5 g - CuCl2 87.92 g - Iron(II) sulfide 39.95 g - argon gas 32.04 g - methanol, CH3OH

1.00 mol of sodium has a mass of ________.

23.0 g

What is the mass of 2.75 mol of sodium hydrogen carbonate, NaHCO3?

231 g

One mol of helium gas has a mass of ________.

4.00 g

What is the percent by mass of chlorine in potassium chloride?

47.6%

Calculate the number of grams of sulfuric acid (H2SO4) in 6.00 mol.

588 g

The molar mass of calcium hydroxide, Ca(OH)2, is ________.

74.10 g

What is the mass percent of carbon in methane, CH4?

74.9%

What is the molar mass of lactic acid, C3H6O3?

90.08 g

The empirical formula of a compound is CH2, and its molar mass is about 42.g. What is its molecular formula?

C3H6

he empirical formula of glucose (C6H12O6) is ________.

CH2O

What is the formula of the compound between calcium and sulfur that has the percent composition 55.6% (by mass) calcium and 44.4% (by mass) sulfur?

CaS

The empirical formula of a compound is NO2, and its molar mass is about 92.g. What is its molecular formula?

N2O4

The mass of 1.00 mol of water is 18.0 g.

True.

The molar mass of copper(II) chloride is 134.5 g.

True.