Question

How much mass is in a 3.25-mole sample of `NH_4OH`?

Answer 1

`"114 g"`.

Explanation:

First, we'll need to find out the mass of `1` mole of `NH_4OH`.
To do this, we need to add up the masses of one mole, or molar masses, of its constituent atoms:

`"1 mole" = N+Hxx4+O+H = "14.01 g/mol" + "1.008 g/mol" xx 4 + "16.00 g/mol" + "1.008 g/mol" = "35.05 g/mol"`

Now, to find the mass of `3.25` moles of `NH_4OH`, we'll just need to multiply its molar mass by `3.25`:

`"mass" = "number of moles" xx "mass of 1 mole"`
`= "number of moles" xx "molar mass"`
`= "3.25 mol" xx "35.05 g/mol" = "114 g"`