an aspirin tablet has a mass of about 325mg. calculate the total mass of aspirin in a 500-tablet bottle in grams and ounces.

hey

where do i start here? do i multiply the 325mg by 500 first or am i converting the 325mg to grams? 

Bottle has 500 tablets.

mass of aspirin in a bottle (mg) = 500 tablets x 325 mg/tablet = 162500 mg

mass of aspirin in a bottle (g) = 162500 mg x 1/1000 (g/mg) = 162.5 g

mass of aspirin in a bottle (oz) = 162.5 g x 1/28.3 (oz/g) = 5.74 oz