Aspirin : 180.157 g/mol (according to Wikipedia - props)
(0.325g)/(180.157g/mol) = 0.0018mols
Unit logic :
(g )/ (g/mol) {multiply by reciprocate} = (g) x (mol/g) {"(g/g)= 1} = 1mol = mol
200/1000 x 6 = 1.2 moles
5
200g times 342.2965 g/mol = 68459.3 moles
200
200 g CH4 x 1 mole CH4/16 g = 12.5 moles CH4
The molecular weight of Calcium Bromide is extremely close to 200. So 1200/200 = 6 moles present.
20
So molarity means moles per litre. but you don't have a litre. if you did you'd have 1000/200 times the moles that you have. 2 moles / 200 x 1000 is 10 moles. As it is per litre, it is 2 molar.
(0.102gx1mole)/99g CuCl = 1.031x10^-3 moles
.0150 mol
200 mL is 0.200 L and 0.90 M means 0.90 moles/L So, 0.200 L x 0.90 moles/L = 0.18 moles
200 mm^3