Answer:

Explanation:
A pressure of 1 atm and a temperature of 0 °C is the old definition of STP. Under these conditions, 1 mol of a gas occupies 22.4 L.
1. Calculate the moles of hydrogen.

2. Calculate the number of molecules

Answer:
yes it is true.
Ice floats on the surface of water because ice is less dense than liquid water
Explanation:
H........................................
<u>Molar mass of CO₂:
</u>
mC + 2×mO = 12g + 2×16g = 12g + 32g =<u> 44 g/mol</u>
I believe transition metals are coinage metals. The answer should be A.