Review Final Exam

How many grams of titanium (Ti) are contained in 1.505 x 10²³ atoms of titanium?

• 0.250 mole

• 12.0 g

• 7.21 x 10²⁴ g

• 0.250 g

Given the following reaction: MgSO₄ + 2NaOH → Mg(OH)₂ + Na₂SO_4. How many grams of magnesium hydroxide are produced from 10.0 g each of magnesium sulfate and sodium hydroxide?

• 7.29 g

• 4.85 g

• 10.0 g

• 3.43 g

In chemistry, a "mole" of something is an amount that __________.

• has a mass of 1 kilogram

• is equal to 6.02 × 10 particles

• fills a volume of 1 liter

• D has a mass of 1 gram

To find the number of atoms in two moles of calcium, multiply the number of moles by

• 12.04 × 10²³

• 8.02 × 10²³

• 6.02 × 10²³

• 2.06 × 10²³

One mole of glucose is equal to 180 grams. How many molecules are in 180 grams of glucose?

• 6.02 × 10²³

• 12.04 × 10²³

• 30

• 180

Oxygen has an atomic number of 8 and an atomic mass of 16.00 grams. How many moles of oxygen are contained in 64.00 grams of oxygen?

• 2.00 moles

• 4.00 moles

• 8.00 moles

• 16.00 moles

How many molecules does a sample of an ideal gas contain if it is held in a 5.75 L container at 2.00 atm of pressure, and at a temperature of 25 °C?

• 2.8 × 10²³ molecules

• 0.47 molecules

• 2.8 × 10²¹ molecules

• 3.4 × 10²⁴ molecules

What volume does 3.0 mol of a gas occupy at 2 atm and 10 °C?

• 14.9 L

• 22.4 L

• 33.6 L

• 34.9 L

How many atoms are in a 4.67 g sample of silicon?

• 3.62 x 10²⁴

• 1.00 x 10²³

• 4.59 x 10²¹

• 2.81 x 10²⁴

A chemist analyzes the amount of lead in a paint sample and finds that the sample contains 0.01 grams of lead. Which of the following is the most accurate determination of the number of lead atoms the sample contains?

• 6.02 × 10²¹ lead atoms

• 2.91 × 10¹⁹ lead atoms

• 1.28 × 10²⁵ lead atoms

• 1.24 × 10²⁶ lead atoms