Spring Midterm Review

What is the molar mass of BaBr₂?

• 217.23

• 297.13

• 219.2

• 156.33

What is the molar mass of Ca(NO₃)₂?

• 70

• 150

• 164

• 204

How many moles are in 35 grams of Li?

• 5.04

• 242.9

• 2.107 x 10²⁵

• 5.81 x 10^-23

Find the percent of oxygen (O) in silver nitrate (AgNO₃).

• 0.2825%

• 28%

• 9%

• 12%

Which of the following could fit in the trunk of your car?

• a mole of rice grains

• a mole of lacrosse sticks

• a mole of Starbursts

• a mole of CH₄ molecules

Which contains more atoms: strontium (Sr) or sulfur (S)

• 1 mole of Sr

• 1 mole of S

• they both have the same number of atoms

Given the molecular formula: C₁₀H₂₂, determine the empirical formula.

• CH

• CH₂

• C₅H₁₁

• C₂₀H₄₄

The excess reactant is

• the reactant that runs out first

• the reactant that stops the reaction from making more

• the reactant that determines how much product that will be made

• the reactant that is left over after the reaction is complete

Which is the limiting reactant?

• oxygen (red dots)

• phosphorus (green dots)

• P₂O₅

• all of the reactants are used up

What is the molar ratio between nitrogen (N₂) and ammonia (NH₃)?

• 1:2

• 1:3

• 2:3

• 1:1