Calcium hydride reacts with water to form calcium hydroxide (aqueous) and hydrogen gas. How would you write a balanced chemical equation for the reaction? How many grams of calcium hydride are needed to form 4.600 of hydrogen?

Question

12779 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2016-06-11T16:06:14

#CaH_2(s) + 2H_2O(l) rarr Ca(OH)_2(aq) + H_2(g)uarr#

Approx. #100*g# calcium hydride are required.

If #4.6*g# of dihydrogen are evolved, this is a molar quantity of #(4.6*g)/(2.016*g*mol^-1)# #=# #2.28# #mol#.

If #2.28*mol# dihydrogen are evolved, then at least a an equivalent molar quantity of calcium hydride was used.

i.e. #2.28*molxx42.094*g*mol^-1" calcium hydride"# #=# #??g#