2 part reaction problem

Chemistry
Tutor: None Selected Time limit: 1 Day

Calcium hydride reacts with water to form calcium hydroxide and hydrogen gas.

(a) Write a balanced chemical equation for the reaction. (Use the lowest possible coefficients. Include states-of-matter under SATP conditions in your answer.)
(b) How many grams of calcium hydride are needed to form 6.491 g of hydrogen?
Jul 24th, 2015

Thank you for the opportunity to help you with your question!

CaH2(s)+2H2O(l)=Ca(OH)2(s)+2H2(g)

6.4919/1.008= 3.22moles of hydrogen used.

For I mole of calcium hydride, 2 moles of hydrogen was formed hence the amount of calcium hydride used in moles is 3.22/2=1.61 moles of calcium hydride. 

Hence mass= moles *molar mass which is 1.61moles*42.094= 67.77g

Hence 67.77g of calcium hydride was used.


Please let me know if you need any clarification. I'm always happy to answer your questions.
Jul 24th, 2015

Did you know? You can earn $20 for every friend you invite to Studypool!
Click here to
Refer a Friend
...
Jul 24th, 2015
...
Jul 24th, 2015
May 29th, 2017
check_circle
Mark as Final Answer
check_circle
Unmark as Final Answer
check_circle
Final Answer

Secure Information

Content will be erased after question is completed.

check_circle
Final Answer