Moles & Mass
Which term refers to the mass of one mole of a substance?
Molar Mass
What type of reaction is represented by the following equation:
H2 + Cl2 → 2HCl
Synthesis
How many grams are in 5.0 moles of oxygen gas?
160 grams of O2
What is a limiting reactant?
The reactant that will run out first!
What is the molarity of a solution prepared by dissolving 10.0 moles of NaCl in 20.0 Liters of solution?
0.5 M
How many grams are in 4.0 moles of CO2?
176 g of CO2
Balance the following equation:
C5H10 + O2 → CO2 + H2O
C5H10 + 8O2 → 5CO2 + 5H2O
How many moles are in 75.0 grams of table salt?
1.28 moles of NaCl
In the following reaction 12.0 grams of Zn and 15.0 grams of HCl are mixed. Which is the limiting reactant?
Zn + 2HCl → ZnCl2 + H2
HCl
How do you calculate molality?
Moles of solute divided by kg of solvent.
If you have 2.5 moles of water, how many molecules of water do you have?
2.107 x 1024 molecules
Identify the reaction type for the equation:
2NaOH + H2SO2 → Na2SO2 + 2H2O
Double Displacement
How many moles of copper sulfate are needed to react with 3.0 moles of NaCl, given the reaction:
CuSO4 + 2NaCl → CuCl2 + Na2SO4
1.5 moles of CuSO4
If 250 grams of sodium chloride react with excess copper sulfate in a double displacement reaction, how many moles of copper chloride will be formed?
2.14 moles of CuCl2
If 2.00 L of NaOH solution as a concentration of 0.50 M, how many moles of NaOH are present in the solution?
1.00 mol NaOH
What is the molar mass of calcium carbonate?
100.09 g/mol
What are the products of the following reaction, and what type is it?
Na + MgCl2 →
2Na + MgCl2 → Mg + 2NaCl
Single Displacement
If 18.0 grams of methane (CH4) react with oxygen in a combustion reaction, how many grams of CO2 will be produced?
49.5 grams of CO2
If 100.0 grams of potassium and 150.0 grams of oxygen react, how many grams of potassium oxide will be produced?
4K + O2 → 2K2O
111.9 grams of K2O
What is the molality of a solution prepared by dissolving 15.0 grams of NaCl in 100.0 grams of water?
2.56 m
If you have 0.75 moles of Na2CO3, how many sodium atoms are present?
9.03 x 1023 sodium atoms
Predict the products, balance, and classify the following reaction:
C6H6 + O2 →
2C6H6 + 15O2 → 12CO2 + 6H2O
Combustion
What mass of water will be produced when 25.0 grams of octane (C8H18) reacts with excess oxygen?
C8H18 + 12O2 → 8CO2 + 9H2O
35.5 grams of H2O
If 400. grams of ammonia and 500. grams of oxygen are mixed, how much excess reactant will remain?
4NH3 + 3O2 → 2N2O + 6H2O
O2 is the limiting reactant.
20.8 moles of NH3 are used.
2.67 moles of NH3 are left over.
If 1.0 kg of a chemical is dissolved in 10.0 kg of water to create a 0.5 molal solution, what is the molar mass of the chemical?
10.0 kg/mol