How many grams of ethanol c2h5oh are required to make a 7.1m solution using 160.0g of water?

The enthalpy of formation of water is -285.8 kj/mol. what can be inferred from this statement?

Margaret wants to make an orange flavored drink by stirring powdered drink mix into a glass of water. she doesn't like drinks that have small clumps of powdered solid in them, so she wants the drink to be a perfect solution. what factors should margaret not consider when deciding how much powder to add to her glass of water?

Acompound has a molecular weight of 12.124 atomic mass units and the empirical formula c3h40. what is the molecular formula of the compound?