A drop of water contains 2 x 10^4 bacteria. How many bacteria are in 100 gallons of water? [1 drop = 1 mL] *USING DIMENSIONAL ANALYSIS*

How many grams of co(g) are there in 74.5 ml of the gas at 0.933 atm and 30o c?

Marcel just purchased 1.69 grams of iron fillings in order to make living putty for his 6 year old niece. how many moles of iron are made in his sample?

How many molecules are in 6.0 moles of methane