# State the no of neutrons in 1.6 g of methane ______?

molar mass = 16 gm

16 gm = 1 mole

1,6 gm= $\frac{1}{16}\times 1.6$ =0.1moles

1 mole of methane has 6.023$\times {10}^{23}$ molecules

so 0.1 moles have $0.1\times 6.023\times {10}^{23}=6.023\times {10}^{22}$ molecules

1 molecule = 6 neutrons (1 C has 6 neutrons , H has no neutrons)

so $6.023\times {10}^{22}$ molecules have =$6\times 6.023\times {10}^{22}$ =$3.6\times {10}^{23}neutrons$

Regards!

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