Calcium hydride reacts with water to form calcium hydroxide and hydrogen gas. The balanced equation to this is #CaH_2+2H_2O#----#Ca(OH)_2+2H_2# How many grams of calcium hydride are needed to form 8.400 g of hydrogen?
1 Answer
You need
Explanation:
There are four steps to answering this type of stoichiometry problem.
- Write the balanced equation for the reaction.
- Use the molar mass of
#"H"_2# to convert grams of#"H"_2# to moles of#"H"_2# . - Use the molar ratio from the balanced equation to convert moles of
#"H"_2# to moles of#"CaH"_2# . - Use the molar mass of
#"CaH"_2# to convert moles of#"CaH"_2# to grams of#"CaH"_2# .
Step 1. Write the balanced equation.
Step 2. Convert grams of
The molar mass of
Step 3. Use the molar ratio to calculate the moles of
From the balanced equation, the molar ratio is
Step 4. Convert moles of
The molar mass of
The reaction requires
This video link allows you to furthur practice similar problems.