How many grams are there in 2.5 moles of c2h6oh?

Each mole of substance contains 6.02 x 1023 component parts, in this case water molecules.

If you have 2.3 moles of water you will have 2.3 x 6.02 x 1023 which is 1.3846 x 1024 molecules.

Each molecule contains 2 hydrogen atoms, so the total number of hydrogen atoms in 2.3 moles of water will be 2 x 1.3846 x 1024 = 2.7692 x 1024.

colorless gas, exhibiting a blue glow when placed in an electric field

b) solid

its a type of rock

50.23 i believe is correct but don't quote me on that.