Level 1: Moles
How many moles of H3PO4 are produced when 71 g of P4O10 reacts to form H3PO4?
Use the equation P4O10+ 6H2O -> 4H3PO4
1.00 mole of H3PO4
C6H12O6 -> 2 C2H5OH + 2 CO2 Using the formula above, calculate the mass of ethanol (C2H5OH) produced if 500 g of glucose (C6H12O6) reacts completely.
255.7 g C2H5OH
How many litres of Oxygen (O) are needed to react with 3.6 litres of Hydrogen (H) to form water (H2O)?
3.6 litres of Oxygen
Lime (CaO) is produced by the thermal decomposition of limestone (CaCO3) in the reaction CaCO3 -> CaO+ CO2. What mass of lime (in g) can be produced from 1.5 x 103 g of limestone?
8.4 x 102 g of CaO
If 17.5 moles of ethanol (C2H5OH) were produced, how many moles of glucose (C6H12O6) were there at the start?
C6H12O6 -> 2 C2H5OH + 2 CO2
8.75 mol C6H12O6
Cl2 + 2KBr -> Br2 + 2KCl
How many grams of potassium chloride (KCl) would be produced from 356 g of potassium bromide (KBr)?
223 g KCl
How many litres of chlorine gas (Cl2) can be produced when 0.98 L of HCl react with excess O2 at STP? Use the equation 4HCl + O2 -> 2Cl2 + 2H2O to help you.
Hint: Remember that at STP, 1 mol = 22.4 L
0.49 L Cl2
Using this formula: C6H12O6 -> 2 C2H5OH + 2 CO2
Calculate the volume of carbon dioxide gas produced at STP if 100 g of glucose (C6H12O6) reacts.
Hint: Remember that at STP, 1 mole is equivalent to 22.4 litres
24.9 L CO2
Using the following equation, determine how many moles of Iron (Fe) can be made from 3 moles of Fe2O3.
Fe2O3 + 3H2 -> 2Fe + 3H2O
6 moles of Fe
Mercury (Hg) can be obtained by reacting mercury (II) sulfide with calcium oxide (CaO). How many grams of calcium oxide are needed to produce 36 g of Hg? 4HgS + 4CaO -> 4Hg + 3CaS + CaSO4
1.01 x 101 g CaO
How many litres of hydrogen gas (H2) are needed to react with CS2 to produce 2.50 L of CH4 at STP?
4H2 +CS2 -> CH4 + 2H2S
Hint: Remember that at STP, 1 mol = 22.4 L
1.00 x 101 L H2
Using the equation 4Al +3O2 -> 2Al2O3, how much aluminium is needed to react with 45 g of O2?
1.875 mol Al
Butane is a compound represented by the elements (C4H10). In the equation 2 C4H10 + 13 O2 -> 8 CO2 + 10 H2O how many grams of CO2 are produced from the combustion of 100 g of butane?
303 g of CO2
Using the following equation 7O2 + 4NH3 -> H2O + 4NO2 , how many litres of NH3, at STP, will react with 5.3 g of O2 to form NO2 and water?
Hint: Remember that at STP, 1 mole = 22.4 L
2.12 L NH3
In the equation 2KClO3 -> 2KCl + 3O2, how many moles of Oxygen are produced if 3 moles of KClO3 decompose?
4.5 moles of O2
Aluminium reacts with sulfuric acid to produce aluminium sulfate and hydrogen gas.
2Al + 3H2SO4 --> Al2(SO4)3 + 3H2
How many grams of aluminium sulfate would be formed if 250g of H2SO4 completely reacted with aluminum?
290 grams of Al2(SO4)3
Using the equation 4NH3 + 6NO -> 5N2+ 6H2O, how many litres of NH3 are needed to react completely with 30 L of NO at STP (Standard Time and Pressure)?
Hint: Remember that at STP, 1 mole is equivalent to 22.4 litres
20 L of NH3