How many molecules are there in 56 mg HCN ?

How many molecules are there in a 3.46 g sample of hydrogen chloride, HCl? Note: The number of molecules in a sample is related to moles of compound (1 mol HCl = 6.023 xx 10^(23) HCl molecules). Therefore if you first convert grams HCl to moles, then you can convert moles to number of molecules).

The density of Water at room temperature is 1.0 g/ml. How many molecules are there in a drop of water if its volume is 0.05 ml ?

How many hours are there in a minute?

How many H_(2)O molecules are there in a snowflake weighing 1 mg?

How many molecules are present in 32 g of methane?

How many -4's are there in -20?

How many whorls are there in a flower?

How many classes are there in viruses?