Question

calculate the mass of 3.011×10²² molecules of a compound (gaseous at STP) is 3.2g.
a) calculate the molecular weight.
b) what will be the volume of 3.2g at STP ?​

Answer 1

Answer:

1 mol = 6.022×10

23

3.01×10

23

=

6.022×10

23

3.01×10

23

=0.5moles

Hence, as per given, 0.5 moles of gas has mass = 20 grams.

So, 1 mol of gas has mass =2×20=40 grams.

Hence, we can say that this gas has molar mass = 40 gram/mole.

1 mole gas has 22.4 L volume at STP, hence, 0.5 moles of this gas 11.2 L volume.