10. a 2.36-gram sample of nahco3 was completely decomposed in an
experiment.
2nahco3 -- na2co3 + h2co3
in this experiment, carbon dioxide and water vapors combine to form
h2co3. after decomposition, the na2co3 had a mass of 1.57 grams.
determine the mass of the h2co3 produced.

0.79 g

Explanation:

Let's introduce a strategy needed to solve any similar problem like this:

Based on the mass conservation law, we need to identify the reactants first. Our only reactant is sodium bicarbonate, so the total mass of the reactants is:

We have two products formed, sodium carbonate and carbonic acid. This implies that the total mass of the products is:

Apply the law of mass conservation:

Substitute the given variables:

Rearrange for the mass of carbonic acid:

1. they vary with a higher number because boiling is way hotter than melting