Calcium hydride, CaH2, reacts with water to produce hydrogen and calcium hydroxide. Write a balanced equation for the reaction and calculate the volume of hydrogen, measured at STP, released from a mixture of 3 mol CaH2 and 5 mol of water.
Pls show method of working. Thanks
2007-03-08 05:01:03 · 2 answers · asked by }{3@T 2 in Science & Mathematics ➔ Chemistry
First, the balanced equation:
CaH2 + 2H2O ----> Ca(OH)2 + 2H2
Notice the 1:2 ratio between calcium hydride and water.
3 moles of the former will require 6 moles of the latter. There isn't enough of that, so we have to look at 5 moles of water, which will react with 2.5 moles of CaH2, producing 5 moles of H2.
This has a volume of 5 x 22.4 litres at STP.
2007-03-08 05:10:45 · answer #1 · answered by Gervald F 7 · 0⤊ 0⤋
to balance:
CaH2 + 2H20----> 5H + CaHO2
I believe that is right. I'm not sure about the other. Hope you can find the answer.
2007-03-08 05:44:20 · answer #2 · answered by ladybug 3 · 0⤊ 0⤋