Answer:
The chemical interaction between calcium (Ca) and water (H2O) has the following balanced chemical equation:
Ca(OH)2 + H2 = Ca + 2H2O
According to the equation, 1 mole of calcium must react with 2 moles of water. Hence, we must utilise the mole ratio of calcium to water to determine how many moles of water are needed to react with 2.0 moles of calcium.
2 moles of H2O are needed for 1 mole of calcium.
Ca requires (2 x 2) = 4 moles of water for every mole of Ca.
As a result, 2.0 moles of calcium requires exactly 4 moles of water to react.
Step-by-step explanation