Mole-Mole Calculations
2C4H10 + 13O2 --> 8CO2 + 10H2O
If 2.75 moles of C4H10 reacts, calculate the number of moles of water that would be produced.
Given - 2.75 moles C4H10
Looking for - moles H2O
Know - 2 moles C4H10: 10 moles H2O
2.75 moles C4H10 x 10 moles H2O/2 moles C4H10 = 13.75 moles H2O
3NO2 + H2O --> NO + 2HNO3
If 7.58 grams of NO2 reacts, calculate the number of moles of NO that would be produced.
Given - 7.58g NO2
Looking for - moles NO
Know - 3 moles NO2: 1 mole NO, 46.005g/mol NO2
7.58g NO2 x 1 mole NO2/46.005g NO2 x 1 mole NO/3 moles NO2 = 0.0549 moles NO
5C + 2SO2 --> CS2 + 4CO
Given 42 grams of carbon, calculate the mass of SO2 needed for the reaction.
Given - 42g C
Looking for - mass SO2
Know - 5 moles C: 2 moles SO2, 12.011g/mole C, 64.064g/mole SO2
42g C x 1 mole C/12.011g C x 2 moles SO2/5 moles C x 64.064g SO2/1 mole SO2 = 90g SO2
4Fe + 3O2 --> 2Fe2O3
If 245.75 grams of iron react, and if the actual yield is 315.5g, calculate the theoretical yield of Fe2O3.
Given - 245.75g Fe
Looking for - grams Fe2O3
Know - 4 moles Fe: 2 moles Fe2O3, 55.845g/mole Fe, 159.687g/mole Fe2O3
245.75g Fe x 1 mole Fe/55.845g Fe x 2 moles Fe2O3/4 moles Fe x 159.687g Fe2O3/1 mol Fe2O3 = 351.36g Fe2O3
315.5g (actual yield)/351.36g (theoretical yield) x 100% = 89.79%
If you start with 158.6g of ammonium sulfate that has a double replacement reaction with barium nitrate, how many grams of ammonium nitrate are produced?
192.0g NH4NO3
2C4H10 + 13O2 --> 8CO2 + 10H2O
If 4.50 moles of oxygen reacts, calculate the number of moles of carbon dioxide that would be produced.
2.77 moles CO2
3NO2 + H2O --> NO + 2HNO3
If 4.57 moles of NO2 reacts, calculate the number of grams of water that would be required for the reaction.
27.4g H2O
5C + 2SO2 --> CS2 + 4CO
If 25.0 grams of SO2 react, calculate the mass of CO produced.
21.9g CO
5C + 2SO2 --> CS2 + 4CO
Calculate the number of particles of carbon disulfide formed if you start with 514.48 grams of carbon.
5.1572 x 1024 particles CS2
If you start with 64.67g of C2H6, how many grams of water will be produced in a combustion reaction?
116.2g H2O
2C4H10 + 13O2 --> 8CO2 + 10H2O
If 2.45 moles of water are produced, how many moles of oxygen would be needed for the reaction?
3.19 moles O2
3NO2 + H2O --> NO + 2HNO3
If 25.0 grams of HNO3 are produced, calculate the number of moles of NO2 needed for the reaction.
0.595 moles NO2
5C + 2SO2 --> CS2 + 4CO
If 82 grams of CO are produced, calculate the mass of SO2 needed for the reaction.
94g SO2
3NO2 + H2O --> NO + 2HNO3
Calculate the number of molecules of water needed to make 57.5 grams of HNO3.
2.75 x 1023 molecules H2O
Hydrogen sulfate is produced in a synthesis reaction between water and sulfur trioxide. If 138.61g of hydrogen sulfate is produced, how much sulfur trioxide did you start with in grams?
113.15g SO3
2C4H10 + 13O2 --> 8CO2 + 10H2O
How many moles of C4H10 would be needed to react with 2.25 moles of oxygen?
0.346 moles C4H10
3NO2 + H2O --> NO + 2HNO3
If 4.8 moles of NO are produced, calculate the mass of NO2 needed for the reaction.
660g NO2
5C + 2SO2 --> CS2 + 4CO
Calculate the mass of carbon needed to react with 175.5 grams of sulfur dioxide.
82.27g C
5C + 2SO2 --> CS2 + 4CO
Calculate the number of particles of carbon monoxide formed if you start with 165.52 grams of sulfur dioxide.
3.1110 x 1024 particles CO
If 93.18g of oxygen is produced from the decomposition of water, how many grams of the compound did you start with?
104.9g H2O
2C4H10 + 13O2 --> 8CO2 + 10H2O
Calculate the number of moles of water that would be made from 12.75 moles of C4H10.
63.75 moles H2O
3NO2 + H2O --> NO + 2HNO3
Calculate the mass of NO2 needed to react with 2.85 moles of water.
393g NO2
5C + 2SO2 --> CS2 + 4CO
Calculate the mass of carbon monoxide produced when 38.91 grams of sulfur dioxide reacts.
34.03g CO
5C + 2SO2 --> CS2 + 4CO
What is the percent yield if 84 grams of carbon disulfide is produced when 75.8 grams of carbon reacts?
84g (actual yield)/96.1g (theoretical yield) x 100% = 87%
If you start with 87.56g of potassium hydrogen phosphate that has a single replacement with nitrogen, how many grams of hydrogen phosphate were produced?
3K2HPO4 + N2 --> 2K3N + 3HPO4
Given - 87.56g K2HPO4
Looking for - grams HPO4
Know - 3 moles K2HPO4: 3 moles HPO4, 174.174g/mol K2HPO4, 95.978g/mol HPO4
Answer: 48.25g HPO4