How many mL are in 0.456 L of water

Which of the following is true for the actual yield of a reaction? it is always calculated as a ratio. it is the yield from the excess reactant. it is the yield from the limiting reactant. it is always less than the theoretical yield.

Calculate the number of moles of ethane in 100 grams

Match the mixture with the substance// i really need on this guys (it’s a pic btw)