3 Quantitative

Question 1

If 24 g of magnesium reacts with 16 g of oxygen to produce 40 g of magnesium oxide, what mass of magnesium would you need to start with to produce 10 g of magnesium oxide?

Answer 1

6g

Question 2

What is the relative formula mass of calcium carbonate, CaCO3?

Answer 2

100

Question 3

The relative formula mass of CaO is 56 and the relative formula mass of CO2 is 44. Work out the mass of CaO that can be obtained from 200 g of CaCO3. CaCO3 ? CaO + CO2.

Answer 3

112 g

Question 4

What mass of CO2 will be produced when 50 g of CaCO3 decomposes?

Answer 4

22 g

Question 5

What is 20 cm3 in dm3?

Answer 5

0.020 dm3

Question 6

__ H2 + O2 –> __ H2O

Answer 6

2 H2 + O2 –> 2H2O

Question 7

__ Na + __ H2O –> __ NaOH + __H2

Answer 7

2Na + 2H2O –> 2NaOH + 1H2

Question 8

__ Zn + __ S –> __ ZnS

Answer 8

1Zn + 1S –> 1ZnS

Question 9

__ Ca + __ HCl –> __ CaCl2 + __ H2

Answer 9

1 Ca + 2HCl –> 1 CaCl2 + 1 H2

Question 10

__ Al + __ Cl2 –> __ AlCl3

Answer 10

2Al + 3Cl2 –> 2 AlCl3

Question 11

__ Al + __ O2 –> __ Al2O3

Answer 11

4Al + 3O2 –> 2 Al2O3