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What is the moles of helium contain 4.00 × 1022 helium atoms?

A sample of argon at 300. °C and 50.0 atm pressure is cooled in the same container to a temperature of . What is the new pressure?

EXTRA CREDIT   25.0 mL of alcohol is dissolved in water and the solution is diluted to a total final volume of 125 mL. What is the final concentration of ethanol?

A rigid ball that contained air at 22 °C and 6.25 atm pressure was placed in an oven at a temperature of What was the new pressure inside the ball?

From the time period of 980-1037, who was the Persian (Iran) philosopher that wrote the book titled, al-Qanun which was considered the first pharmacy book?

___________ is the occasional occurrence when a gas turns directly into a solid without turning into a liquid first.

If you break matter down, it will be comprised of one or more of the ____.

Chemistry is the study of ____.

_____________ describe how a substance interacts with other substance in a chemical reaction.

The temperature value for the boiling point is the same temperature value for the ______. For example, 100OC is the boiling point for water. 100OC is also the _____ for water.