Question 1
Calculate the number of moles of H2SO4 in 50 cm3 of a 0.50 moldm-3 solution.
Ans: 0.025 moles
Question 2
Calculate the number of moles of FeSO4 in 25 cm3 of a 0.2 moldm-3 solution.
Ans: 0.005 moles
Question 3
Calculate the mass of KMnO4 in 25 cm3 of a 0.02 moldm-3 solution.
Ans: 0.079 g
Question 4
Calculate the mass of Pb(NO3)2 in 30 cm3 of a 0.1 moldm-3 solution.
Ans: 0.993 g
Question 5
What is the molarity of 1.06g of H2SO4 in 250 cm3 of solution?
Ans: 0.043 mol dm-3
Question 6
What is the molarity of 15.0 g of CuSO4.5H2O in 250 cm3 of solution?
Ans: 0.24 mol dm-3
Question 7
What volume of a 0.833 moldm-3 solution of H2O2 will be required to make 250 cm3 of a 0.100 moldm-3 solution?
Ans: 30 cm3
Question 8
What volume of a 0.50 moldm-3 solution of HCl will be required to make 100 cm3 of a 0.050M solution?
Ans: 10 cm3
Question 9
How many moles of NaCl are there in 25 cm3 of a 50 gdm-3 solution?
Ans: 0.0214 moles
Question 10
What is the concentration of each type of ion in solution after 23.69 mL of 3.611 M NaOH is added to 29.10 mL of 0.8921 M H2SO4? Assume that the final volume is the sum of the original volumes.
Ans: [OH–] = 0.6369 mol dm-3, [Na+] = 1.62 mol dm-3, [SO42-] = 0.4918 mol dm-3
Question 11
Given 8.00 g of HBr calculate the volume (mL) of a 48.0% (weight/weight) solution. (MW HBr: 80.9119 g/mol, density: 1.49 g/mL). Then, calculate the molarity.
Ans: 8.84 mol dm-3
Question 12
A solution is made by dissolving 0.100 mol of NaCl in 4.90 mol of water. What is the mass % of NaCl?
Ans: 6.21%
Question 13
You need to make an 80.0 g mixture of ethanol and water containing equal molar amounts of both, what mass of each substance would be required?
Ans: 1.25 moles of each.