# How many molecules are there in 9.45 grams of H_2SO_4?

Apr 28, 2016

There are $5.7997 \cdot {10}^{22}$ molecules of H2SO4.

#### Explanation:

moles = mass/Molar mass
moles = 9.45 grams / ((21.01) + 32.07+ (416.00)) grams per moles
moles = 9.45 grams / 98.09 grams/moles
moles = 0.09634 moles of H2SO4

Now that we know the moles of H2SO4 we can use this formula
Number of molecules = moles * Avogadro's number
also known as: N = n * Nav
Number of molecules = 0.09634 * 6.02 *10^23
Number of molecules of H2SO4 = 5.7997 * 10^22 molecules