Question

a sample of sodium reacts completely with 0.568 kg of chlorine, forming 936 g of sodium chloride. what mass of sodium reacted? express your answer to three significant figures and include the appropriate units.

Explanation:

Step1: Convert mass of chlorine to grams

Since 1 kg = 1000 g, then 0.568 kg of chlorine is $0.568\times1000 = 568$ g.

Step2: Use the law of conservation of mass

The law of conservation of mass states that the total mass of reactants equals the total mass of products. Let the mass of sodium be $m$. So $m + 568\ g=936\ g$.

Step3: Solve for the mass of sodium

$m=936\ g - 568\ g=368\ g$.

Answer:

368 g