Whats a mass of NaCl is required to make 1.0L of 1 molar solution

Determine the number o moles of ions/atoms/particle in the following: 2.50 miles of k2s (let me know how to do)

George is a dalmatian puppy. describe what happens to light that allows you to see george’s black and white coat.

Butane gas reacts with oxygen gas to give carbon dioxide gas and water vapor (gas). if you mix butane and oxygen in the correct stoichiometric ratio, and if the total pressure of the mixture is 390 mmhg, what is the pressure (in mmhg) of water vapor after the reaction is completed (temperature and volume do not change).