A student dissolves 4 g of salt into 10 g of water. The total weight of the solution is 14 g. The student then heats the solution until all of the liquid turns into a gas and only the salt is left. The student is able to collect the evaporated gas. The student weighs the salt left over from the solution and the evaporated gas. How much should the student expect the salt and vapor to weigh?
OA 4g
OB 10g
OC 14g
OD 28g