Question

1.how many moles and how many molecules of N are present in 42g of N2?
2.how many moles and molecules of ammonia are present in 136gm of ammonia?
3.what is the volume of STP occupied by 1.22gm of o2. find the number of moles and molecules of co2 in 67200ml of co2 at stp?
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Answer 1

Answer:

1.no.of moles of N=W/M

=>n=42/14

=>n=2

now,

total no. of N2- electrons=10

hence,

no. of moles of electrons=n*avogadro's number*10

=>n'=2*6.022*10^23*10

=>n'=12.044*10^24

Explanation: