The density of propanol is 0.658g/mL. How many grams of propanol should be added to 250.0 mL of
water to make a 3.5 % solution by volume?

(apex) when a cup of water is dropped, as the cup falls, the water in the cup falls out true or false?

Which best describes how johannes kepler developed his laws of planetary motion

Tin has ten stable isotopes. the heaviest, 124sn, makes up 5.80% of naturally occuring tin atoms. how many atoms of 124sn are present in 82.0 g of naturally occurring tin? what is the total mass of the 124sn atoms in this sample?