4th Six Weeks Review

How many sodium atoms are present in 1.00 mole of Sodium Hydroxide, NaOH?

• 3.01 x 10²³

• 12.04 x 10²³

• 6.02 x 10²³

• 6.02 x 10²⁵

What is the empirical formula for a compound that has 66 grams of sodium, 74 grams of sulfur, and 58 grams of oxygen?

• Na₂S₂O₃

• Na₃S₂O₂

• Na₂S₂O₂

• Na₃S₃O₃

Given the balanced equation of NaOH(s) + CO₂(g) → NaHCO₃, how many liters of Carbon Dioxide are needed to produce 355 g of NaHCO₃ of at standard temperature and pressure?

• 2.38 L

• 94.7 L

• 53.3 L

• 84.0 L

Calculate the percent composition of oxygen in BeSO₄•5H₂O.

• 36.1%

• 61.9%

• 65.0%

• 73.8%

A chemical reaction between Carbon and Oxygen gas has stopped making product. If more Carbon is added and the reaction is still not making product, what can we conclude about Carbon?

• There is not enough information to form a conclusion.

• It is the limiting reagent.

• It was never a part of the reaction.

• It is the excess reagent.

How many molecules are in 4.50 moles of CO₂?

• 2.71 X 10²⁴ molecules of CO₂

• 4.15 X 10⁻²⁴ molecules of CO₂

• 3.01 X 10²⁴ molecules of CO₂

• 8.31 X 10⁻²⁴ molecules of CO₂

What is the molar mass of KCl?

• 54.0 g/mol

• 74.55 g/mol

• 119 g/mol

• (1.20 × 10^24) g/mol

What is the molecular formula of a compound that has a molecular weight of 260.0 grams? A 7.00-gram sample contains 3.76 grams of carbon, 0.40 grams of hydrogen, and 2.84 grams of oxygen.

• C₁₂H₁₂O₆

• C₈H₁₆O₈

• C₁₆H₃₂O₁₆

• C₅H₁₀O₅

Which of the following will result in 1.00 mole of lithium phosphide, Li₃P?

• 1 atom of Li and 1 atom of P

• 6.02 X 10²³ ions of Li⁺ and 6.02 X 10²³ ions of P³⁻

• 1 gram of Li and 1 gram of P

• 6.02 X 10²³ moles of Li and 6.02 X 10²³ moles of P

Consider the following reaction: 2 H₂ + O₂ → 2 H₂0 The reaction can be classified as what type of reaction?

• Synthesis

• Decomposition

• Single replacement

• Double replacement