1.

How many nitrogen atoms are in 0.25 mole of Ca(NO3)2?

Answer»

1 mole of Ca(NO3)2 has = 2 N atoms of nitrogen 

0.25 mole of Ca(NO3)2 has = 2 x 0.25 x 6.023 x 1023 atoms of N 

= 3.0 x 1023 



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