Find active mass of 4gm of H2.
Please solve it and explain it.
There has to be some chemical reaction associated with this
In book this line is written in the theory and answer is 2 moles /dm^3 given.
But I don't know method of finding.
So please tell me how I solve it.
I've never heard of "active mass" until now. When I looked it up on Google I found some information to the effect that is was the molarity. So 4 g H2 is 2 mols and if that is in 1 L (1 dm^3) that will be 2 M.
To find the active mass of 4 grams of H2, we need to first understand what active mass means in the context of chemistry.
Active mass refers to the concentration of a substance in a solution, and it is usually expressed in terms of moles per liter (mol/L). In this case, we need to determine the concentration of H2 in moles per liter.
To find the active mass, we can use the formula:
Active Mass (mol/L) = Mass (g) / Molar Mass (g/mol)
First, we need to find the molar mass of H2.
The molar mass of hydrogen (H) is approximately 1.0078 g/mol. However, since we have H2 (two hydrogen atoms bonded together), we need to multiply the molar mass by 2.
Molar Mass of H2 = 2 * 1.0078 g/mol = 2.0156 g/mol
Now we can calculate the active mass:
Active Mass (mol/L) = Mass (g) / Molar Mass (g/mol)
= 4 g / 2.0156 g/mol
Calculating this, we get:
Active Mass (mol/L) = 1.9852 mol/L
Therefore, the active mass of 4 grams of H2 is approximately 1.9852 mol/L.
Note: The active mass can also be expressed in units other than mol/L, depending on the specific context of the problem.