Chapter 3 Part 2

What is the percent by mass of magnesium in MgO?

What is the percent composition by mass of sulfur in the compound MgSO₄ (gram formula mass = 120 g/mol)?

• 20%
• 27%
• 46%
• 53%

What is the empirical formula if you have 88.80% copper and 11.20% oxygen?

Determine the empirical formula when a sample has a composition of 20% Ca and 80% Br.

• CaBr

• CaBr₂

• Ca₂Br

• Ca₂Br₂

Molar mass of NaOH is ______________________

What is a solvent?

• The substance that does the dissolving in a solution.

• The substance that is being dissolved in a solution.

• The mixing of different substances.

• The process in which neutral molecules lose or gain electrons.

Which equation is used to find molarity?

• Moles solute/L solution

• Moles solute/kg solution

• Moles solute/kg solvent

• Grams solute/L solution

What is the molarity of a 0.5L sample of a solution that contains 60.0 g of sodium hydroxide (NaOH)

• 0.8 M

• 1.5M

• 3.0M

• 6.0M

What is the molarity of 3 mole of hydrochloric acid in 3 L of water.

What is the molarity of 4 grams of sodium chloride in 3,800 mL of solution?

• 0.018 M
• 0.018 mol
• 1.052 M
• 1.052 mol