Chapter 10

C4H10, C6H6, HgCl

Calculate the molecular formulas of the compounds having the following empirical formulas and molar masses: CH, 58 g/mol; CH, 78 g/mol; and HgCl, 236.1 g/mol.

15.2 mol

Find the number of moles of argon in g of argon.

d

How many atoms are in 0.075 mol of titanium? a. 1.2 10-25 c. 6.4 10 b. 2.2 10 d. 4.5 10

d

How many molecules are in 2.10 mol CO? a. 2.53 10 molecules c. c. 3.49 10 molecules b. 3.79 10 molecules d. d. 1.26 10 molecules

a

How many moles of CaBr are in 5.0 grams of CaBr? a. 2.5 10 mol c. 4.0 10 mol b. 4.2 10 mol d. 1.0 10 mol

a

How many moles of silver atoms are in 1.8 X 10 ^23 atoms of silver? a. 3.0 10 c. 3.0 10 b. 3.3 10 d. 1.1 10

b

How many moles of tungsten atoms are in 4.8 X 10^25 atoms of tungsten? a. 8.0 10 moles c. 1.3 10 moles b. 8.0 10 moles d. 1.3 10 moles

3,68X10^21

How many representative particles are in 1.45 g of a molecular compound with a molar mass of 237 g?

d

What is the mass in grams of 5.90 mol CH? a. 0.0512 g c. 389 g b. 19.4 g d. 673 g

d

What is the mass of oxygen in 250 g of sulfuric acid, HSO? a. 0.65 g c. 16 g b. 3.9 g d. 160 g

c

What is the molar mass of (NH)CO? a. 144 g c. 96 g b. 138 g d. 78 g

d

What is the molar mass of AuCl3? a. 96 g c. 232.5 g b. 130 g d. 303.6 g

4.46 %

What is the percent by mass of hydrogen in aspirin, CHO?

d

Which of the following compounds has the highest oxygen content, by weight? a. NaO c. BaO b. CO d. HO