18) 10 Calcium reacts with water as shown. Ca(s) + 2H20m) + Ca(OH)2(aq) + H2(g)
What is the total mass of the solution that remains when 40 g of calcium
reacts with 100 g of water?
А
58 g
B 749
D 140 g
C 138 g
19) 12 Hydrogen reacts with oxygen as shown in the equation below.
2H2(g) + O2(g) → 2H20)
How much gas will remain if 2 dm of hydrogen are reacted with 1 dm of
oxygen at room temperature?
A 0 dm3
B
1 dm3
C2 dm3
D 3 dm3