A balloon is filled with 8.964 liters of He at STP. How many moles of helium gas are in the balloon?

What is the chemical formula of magnesium bromide? a. mgbr2 b. mgbr c. mg2br2 d. mg2br

The following transition occurs at a molecular level for a substance. what transition corresponds to this change in microscopic structure? the carbon dioxide molecules on the left are in a regular, tightly packed pattern. after heating, it becomes much lower density. a. melting b. boiling c. sublimation d. freezing

Which of the following subject areas contains questions that can be answered by science? alchemy ethics forensics politics