Chemistry help, please!?

To solve mole calculations, first you must use the mole-hole (the circle thing). Then, you should be able to just follow that and get the answer, by dividing 1.77 g by the number on the mole-hole. But, divide by those two numbers, by do not multiply. Once you get that second answer, you should multiply by the liter numbers and you should get a answer. I have provided some websites to help you better!