(Answered) Please guide me and help me understand the combined gas

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Please guide me and help me understand the "Combined Gas Law"

1) A 350 ml sample of helium gas is collected at 25 degrees C. What volume would this gas occupy at STP?

2) A sample of neon is collected at 2.7 atm and 12.0 degrees C. It has a volume of 2.25 L. What would be the volume of this gas at STP?

3) A sample of argon has a volume of 205 cm³ when its temperature is -44.0 degrees C and its pressure is 712 kPa. What would be the volume of the argon at STP?

4) A student collects a 3.00 x 10²cm³sample of hydrogen at 22.0 degrees C and 91.9 kPa. What volume would the hydrogen occupy at STP?

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