Mole
Chemical Reactions
Stoichiometry
Molarity and Dilutions
Limiting Reagents
100
What is a mole?
A mole is the amount of pure substance containing the same number of chemical units as there are atoms in exactly 12 grams of carbon-12 (i.e., 6.023 X 1023).
100
Balance the following reaction: __H2 + __F2 ----> __ HF
_1_H2 + _1_F2 ----> _2_ HF
100
2 H2(g) + O2(g) → 2 H2O(l) How many grams of water are produced when 6 moles of oxygen are burned?
There 54 grams produced
100
What is the molarity if we dissolve 6 mol of a compound in 12 Liters?
0.5M
100
A 2.00 g sample of ammonia is mixed with 4.00 g of oxygen. Which is the limiting reactant?
Oxygen
200
How many moles are in 30 grams of Carbon?
2.5 moles C
200
Balance the following reaction: __Mg + __CuCl2 ----> __ MgCl2 + __Cu
_1_Mg + _1_CuCl2 ----> _1_ MgCl2 + _1_Cu
200
What is the Molarity when we dissolve 16 grams of Sulfur in 250 milliliters?
2M Sulfur solution
200
2 H2(g) + O2(g) → 2 H2O(l) If 20 grams of H2 gas is reacted with 96 grams of O2 gas, Which reactant is the limiting reactant?
Oxygen.
300
How many grams are in 3.2 moles of Phosphorous?
There are 99.1 grams.
300
Balance the following reaction: __CH4 + __ O2 ----> __ CO2 + __H2O
_1_CH4 + _2_ O2 ----> _1_ CO2 + _2_H2O
300
What is the molarity when 0.785 grams of fluorine is dissolved into 10 mL of water?
4.13 M Fluorine solution
300
What is a limiting reagent?
In a chemical reaction, the limiting reagent, also known as the "limiting reactant", is the substance which is totally consumed when the chemical reaction is complete. The amount of product formed is limited by this reagent since the reaction cannot proceed further without it.
400
How many moles are in 18.5 grams of NH4F?
0.5 moles
400
In the following reaction what is the whole number ratio that corresponds to CaCl2: __NaOH + __CaCl2 ----> __NaCl + __Ca(OH)2
2
400
If we have 1 liter of a 10 M solution and then add water until the new volume is 5 liters, what is the new concentration of the solution?
2M
400
A 50.6 g sample of Mg(OH)2 is reacted with 45.0 g of HCl according to the reaction: Mg(OH)2 + 2 HCl --> MgCl2 + 2 H2O What is the theoretical yield of MgCl2?
58.6 g MgCl2
500
How many grams are in 1.7 moles of CH3COOH?
There are 102 grams.
500
In the following reaction what is the whole number ratio that corresponds to H2: __N2 + __H2 ----> __NH3
3
500
A solution is prepared by dissolving .456 grams of oxygen into 260 mL of water. Then your professor tells you to add an additional 240 mL of water. What is the final concentration?
0.057 M solution.
500
Take the reaction: NH3 + O2 NO + H2O. In an experiment, 3.25 g of NH3 are allowed to react with 3.50 g of O2. How many moles of NO are formed?
.0877 moles NO
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