Question

according to the law of conservation of mass, 8 grams of hydrogen and 32 grams of oxygen will combine to form how many grams of water? 4 grams mr. chem was eating in the kitchen. 24 grams the injury was not done using a fallen object. 40 grams miss zoo was enjoying the pool. there is no way of knowing without being given the balanced equation. 21? the victim was not electrocuted. converted to energy mr. chem was strolling by the pool. changed by gravity the victim was not electrocuted. neither created nor destroyed the injury was not because of a fallen object.

Explanation:

Step1: Recall the Law of Conservation of Mass

The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction. So, the mass of reactants equals the mass of products.

Step2: Calculate the mass of water

Given the mass of hydrogen ($m_{H_2}=8$ grams) and oxygen ($m_{O_2}=32$ grams). The mass of water ($m_{H_2O}$) formed is the sum of the masses of hydrogen and oxygen. Using the formula $m_{H_2O}=m_{H_2}+m_{O_2}$.
Substitute the values: $m_{H_2O}=8 + 32$.

Answer:

40 grams