Question

1. Under certain conditions, the substances nitrogen monoxide and oxygen combine to form nitrogen dioxide.

If 23.7 grams of nitrogen monoxide and  12.6 grams of oxygen combine to form nitrogen dioxide, how many grams of nitrogen dioxide must form?

grams nitrogen dioxide

2.Under certain conditions, the substance calcium carbonate can be broken down to form calcium oxide and carbon dioxide.

If 22.3 grams of calcium carbonate react to form 12.5 grams of calcium oxide, how many grams of carbon dioxide must simultaneously be formed?

grams carbon dioxide

3.

Write the net ionic equation for the precipitation of zinc hydroxide from aqueous solution:

4. Write the net ionic equation for the precipitation of nickel(II) carbonate from aqueous solution:

5.The compound cobalt(II) acetate is a strong electrolyte. Write the reaction when solid cobalt(II) acetate is put into water:

6.The compound silver acetate is a strong electrolyte. Write the reaction when solid silver acetate is put into water:

Answer 1

From Law of conservation of mass, Mass of Reactants = mass of products.

1. Reaction is;

2 NO + O₂ 2NO₂

Mass of NO given = 23.7g

Mass of O₂ given = 12.5 g

Thus, total mass of reactants = MAss of NO + Mass of O₂ = 23.7 + 12.6 = 36.3 g = mass of NO₂ fromed

Thus, Mass of NO₂ that must be formed = 36.3 g

2. reaction is

CaCO₃ CaO + CO₂

Mass of CaCO₃ reacts = 22.3 g

Mass of CaO formed = 12.5 g

NOw, Mass of CaCO₃ reacts = Mass of CaO formed + Mass of CO₂ formed

22.3 g = 12.5 g + Mass of CO₂ formed

Mass of CO₂ formed = 22.3-12.5 = 9.8g

Thus, Mass of CO₂ formed = 9.8g

3. Net ionic reaction is

Zn²⁺(aq) + 2OH^- (aq) Zn(OH)₂ (s)

4.reaction is

Ni²⁺ (aq) + CO₃^2- (aq) NiCO₃ (s)

5. cobalt(II) acetate is a strong electrolyte. Thus, it will dissociate into ions completely when we put it into water as:

Co(C₂H₃O₂)₂ (s) --> Co²⁺ (aq) + 2C₂H₃O₂^- (aq)

6. Similarly, The compound silver acetate is a strong electrolyte. when solid silver acetateis put into water, reaction is:

C₂H₃O₂Ag (s) C₂H₃O₂^- (aq) + Ag⁺ (aq)