Stoichiometric Extras
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Determine the % Composition of EACH element:
MnO4
Mn= 46.22% Mn
O4 = 53.78% O4
Determine the % composition in EACH of the elements in the following compound:
C2H3O2
C2 = 40.68%
H3 = 5.08%
O2 = 54.24%
Determine the oxidation number of the elements in the following compound:
H2O
H2= +1
O= -2
If 3 L of CO2 gas was collected at 7 atmospheres of pressure, what would the volume be in milliliters, at 4 atmospheres of pressure?
5.25 x 103 mL CO2
If 3 x 103 L of Hydrogen gas was collected at -145oC and 7 atmospheres, what must the pressure be now if the volume is 400 L and the temperature is 23oC?
121.41 atm H2
Using the balanced equation, find the limiting reactant when you have spilled 3.4 grams of HCL and put 4.2 grams of Ca(OH)2 on it.
1 Ca(OH)2 + 2HCl --> 1 CaCl2 + 2 H2O
HCl
Using the balanced equation, find the limiting reactant when you have spilled 8.75 grams of NaCl and put 2.2 grams of LiNO2 on it.
1 LiNO2 + 1 NaCl --> 1 LiCl + 1 NaNO2
The limiting reactant is LiNO2
A sample of water was analyzed and found to have [H+] = 5.34 x 10-7 M. Calculate the pH of the water.
pH= 6.27
2.79 L CN
If 2 x 103 L of Helium gas was collected at 345 K and 2.25 atm, How many moles of the gas are in the sample?
158.87 Moles He
Balance the equation and find the percent yield if 5.32g of As2O3 is used and 3.22g of As is produced.
As2O3 + H --> OH + As
1 As2O3 +3 H --> 3 OH + 2 As
% yield= 79.89% of As
Balance the equation and find the percent yield if 8.9 g of MnO4 is used and 3.5 g of Manganese is actually produced.
MnO4 + Cl2 --> ClO + Mn
1 MnO4 + 2 Cl2 --> 4 ClO + 1 Mn
% yield= 85.09 % of Mn
Balance the following redox reaction that takes place in an acidic solution.
As --> H3AsO4 + AsH3
12 H2O + 8 As --> 3 H3AsO4 + 5 AsH3
If 400 L of Hydrogen gas was collected at 45oC and 3.5 atmospheres, what will the volume, in liters, be at 5 atmospheres and 435oC?
623.40 L H2
If 2.34 x 10-4 L of Bromine gas was collected at 4.34 atmospheres, what would the volume be in milliliters, at 16 atmospheres?
6.34 x 10-8 mL Br2
A compound is found to contain 26.5% Fe and 73.5% S. Find its Empirical formula.
FeS5
A compound is found to contain 40.50% Sodium and 59.5% Br. Find its Empirical formula.
Na7Br3
Balance the following redox reaction that takes place in an acidic solution.
HSO5-+ ClO2----> ClO3- + SO42-
HSO5-+ ClO2----> ClO3- + SO42- + H+
A balloon has 6250 mL of CO2 in it at 23oC. If the ballon holds 8000 mL, what must the temperature, in degrees Celsius, be in order to fill the balloon?
29.44oC CO2
If 2 x 104 mL of Xeon gas is collected, what will happen to the volume, in milliliters, if the temperature doubles?
4.0 x 104 mL Xe
The molar mass of a compound is 120 g. If 13 g of Nitrogen is mixed with 14 g of Oxygen, what is the molecular formula?
N4O4
The molar mass of a compound is 3060 g. If 15 g of Rubidium is mixed with 30 g of Argon , what is the molecular formula?
Rb12Ar51
Balance the following redox reaction that takes place in a basic solution.
Te + NO3- → TeO32- + N2O4
Te + 4 NO3- + H2O --> TeO32- + 2 N2O4 + 2 OH-
If 200 mL of Fluorine gas was collected at 3 atmospheres, how many moles of Fluorine gas are present if the temperature of the sample is 89oC?
2.02 x 10-2 Moles F2
How many grams of Nitrogen gas will occupy a volume of 247 mL at 3 atmospheres and a temperature of 43oC?
8 x 10-1 grams N2