Question

5.6 L of a triatomic gas at STP weighs 16 g.
Number of atoms in 64 g of the gas is
(NA represents Avogadro number)
(1) NA
(2) 2 NA
(3) 3 NA
(4) 4 NA​

Answer 1

Answer:

3NA

Explanation:

Given data: gas at STP=5.6L wiegh 16gm

no. of mole in 5.6L gas is 0.25mole

In 0.25 mole it wiegh 16gm gas

therefore the atomic mass of gas will be 16/0.25=64

so the given solute is also 64gm

therefore no. of moles =1moles

we know that

the gas is triatomic means it's valency is 3

so the no. of atoms in 1 mole of triatomic gas is 3NA

Answer 2

Answer: 3 NA

Explanation:

16g triatomic gas ----