Question

Calculate the mass percent for all components in a solution containing the following. 0.350 Kg of water, 5.4 moles of ammonia and 195.0 grams of cobalt (II) nitrate. (The salt completely dissociates)

Answer 1

• % Water = 54.96%

• % Ammonia = 0.14%

• % Cobalt (II) Nitrate = 30.62%

Step-by-step explanation:

To calculate mass percent, first we need to calculate the total mass of the mixture:

• Mass Water ⇒ 0.350 kg Water = 350 g water

• Mass Ammonia⇒We use ammonia's molar mass⇒5.4 mol * 17 g/mol = 91.8 g

• Mass cobalt (II) nitrate ⇒ 195.0 g

Total Mass = Mass Water + Mass Ammonia + Mass Cobalt Nitrate

• Total Mass = 350 g+ 91.8 g+ 195 g = 636.8 g

To calculate each component's mass percent, we divide its mass by the total mass and multiply by 100:

• % Water ⇒ 350/636.8 * 100% = 54.96%

• % Ammonia ⇒ 91.8/636.8 * 100% = 0.14%

• % Cobalt (II) Nitrate ⇒ 195/636.8 * 100% = 30.62%