Chemistry: How many molecules are in 27.8 g NO2

How many molecules are in 27.8 g NO2?
Answer in units of molec

Can you please show me how to do it. I keep getting this one wrong on my practice test. Thanks

molar mass of no2 = 46.00 g/mol


mole of NO2 = mass of NO2 / molar mass of NO2 = 27.8 g / 46.00 g/mol = 0.604 mol

0.604 mol x 6.022x10^23 = 3.64x10^23