Chemistry Stoichiometry Study Guide

What SI unit is used to measure the number of representative particles in a substance?

• kilogram

• ampere

• kelvin

• mole

How many hydrogen atoms are in 5 molecules of isopropyl alcohol, C₃H₇O?

• 5 × (6.02 × 10²³)

• 5

• 35

• 35 × (6.02 × 10²³)

How many moles of tungsten atoms are in 4.8 × 10²⁵ atoms of tungsten?

• 8.0 × 10² moles

• 8.0 × 10¹ moles

• 1.3 × 10⁻¹ moles

• 1.3 × 10⁻² moles

How many moles of silver atoms are in 1.8 × 10²⁰ atoms of silver?

• 3.0 × 10⁻⁴

• 3.3 × 10⁻³

• 3.0 × 10²

• 1.1 × 10⁴⁴

How many atoms are in 0.075 mol of titanium?

• 1.2 × 10⁻²⁵

• 2.2 × 10²⁴

• 6.4 × 10²

• 4.5 × 10²²

How many atoms are in 3.5 moles of arsenic atoms?

• 5.8 × 10⁻²⁴ atoms

• 7.5 × 10¹ atoms

• 2.1 × 10²⁴ atoms

• 1.7 × 10²³ atoms

Butanol is composed of carbon, hydrogen, and oxygen. If 1.0 mol of butanol contains 6.0 × 10²⁴ atoms of hydrogen, what is the subscript for the hydrogen atom in C₄HₓO?

• 1

• 10

• 6

• 8

What is true about the molar mass of chlorine gas?

• The molar mass is 35.5 g.

• The molar mass is 71.0 g.

• The molar mass is equal to the mass of one mole of chlorine atoms.

• none of the above

The mass of a mole of NaCl is the ____.

• molar mass

• atomic mass

• molecular mass

• gram atomic mass

What is the molar mass of AuCl₃?

• 96 g

• 130 g

• 232.5 g

• 303.6 g