Question

Calculate mass of 3g molecules of hno3

Answer 1

molar mass of HNO3 = 1 + 14 + 48 = 63 g

3 moles = 3 x 63 g = 189 grams. That would be the mass.

Hope it helps..!!!

Answer 2

Answer : The mass of $HNO_3$ is, 189 grams

Explanation :

Gram molecules means that the number of molecules present in 1 mole of substance.

First we have to calculate the molar mass of $HNO_3$.

The molar mass of $HNO_3$ = 1 + 14 + 3(16) = 63 g/mole

Now we have to calculate the mass of $HNO_3$.

As, 1 mole of $HNO_3$ contains 63 g/mole mass of $HNO_3$

So, 3 mole of $HNO_3$ contains $3\times 63=189g$ mass of $HNO_3$

Therefore, the mass of $HNO_3$ is, 189 grams