How many moles of potassium sulfate are present in a sample that weighs 45.8g? I do not understand how to solve this please help ​

4. propanol and isopropanol are isomers. this means that they have a) the same molecular formula but different chemical properties. b) different molecular formulas but the same chemical properties. c) the same molecular formula and the same chemical properties. d) the same molecular formula but represent different states of the compound