Question

58.
In the reaction, Ca + 2H20 = Ca(OH)2 + H2; what mass of hydrogen would be formed,
when 8 gm of calcium reacts with excess water?
d.5.4 g
a. 4g
b. 0.4 g
c. 4.4 g
Standard temnerature and standard pressure refer to:​

Answer 1

Answer:

Explanation:

Here, calculation is done, using the balanced chemical equation as follows:

Ca+2H  

2

​  

O→Ca(OH)  

2

​  

+H  

2

​  

 

According to the stoichiometry of reaction, 40 gm of Ca on complete reaction with water liberates =2 gm H  

2

​  

 

∴8 gm of Ca, on complete reaction with water will  liberates =  

40

2

​  

×8 gm H  

2

​  

 

=0.40 gm H  

2

​  

 

=  

2

0.40

​  

×22400cm  

3

 

=4480cm  

3

 of H  

2

​  

 at S.T.P.

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