WILL AWARD BRAINLIEST FOR BEST ANSWER. 100 POINTS Please answer the following 3 questions attached on the image below. Thank you SO much!

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?

Estimate the molar mass of the gas that effuses at 1.6 times the effusion rate of carbon dioxide.

If a refrigerator is a heat pump that follows the first law of thermodynamics, how much heat was removed from food inside of the refrigerator if it released 300j of energy to the room?unit: