Question

the no of molecules in 11.2dmcube of H2 gas at 0degree and 1 atm are ?

Answer 1

The Answer is .:

$3.01 \times {10}^{23} \: molecules$

Explanation:

As we know that at STP (0°C and 1atm)

one mole of each gas occupy a volume equal to 22.4 decimeter cube.

We also know that in one mole of a substance there are

$6.023 \times {10}^{23} \: particles$

THUS TO FIND THE NUMBER OF MOLECULES IN 11.2 DM3 OF H2

first convert it into number of moles

$number \: of \: moles = \frac{11.2}{22.4} = 0.5 \: mol$

Thus the number of molecules in 0.5 moles

$= 0.5 \times 6.023 \times {10}^{23} \\ = 3.011 \times {10}^{23} \: molecules$