Question

18 g of oxygen reacts completely with 4 g of hydrogen we would expect how many grams of water
A. Less than 22 grams
B. More than 22 grams
C. 22 grams because mass cannot be created or destroyed
D. There is no way to tell by this information

Answer 1

Answer:

C. 22 grams because mass cannot be created or destroyed

Explanation:

In this reaction and in any chemical reaction, mass is expected to always be conserved.

According to the law of conservation of matter "in a chemical reaction, matter is neither created nor destroyed but can be changed from one form to another".

• Based on this law, the mass of reactants and products must be the same in a chemical reaction.
• So, the sum of the mass of the reactants must be equal to the mass of the product.