2. How many calories of heat do you need if you want to raise the temperature of

Question

2. How many calories of heat do you need if you want to raise the temperature of 330 g of gasoline from 18.0°C to 22.0°C? Specific heat of gasoline is 0.40 cal/g·°C. (Enter your answer to two significant figures.) Heat = ? cal

3. A scuba-diving tank contains a mixture of oxygen and helium at a total pressure of 6.43 atm. If the partial pressure of the oxygen is 0.61 atm, what is the partial pressure of the helium? Pressure = ? atm

4. A sample of nitrogen occupies 453 mL at a pressure of 642 torr and a temperature of 23°C. What pressure will the nitrogen exert if: a the volume is decreased to 395 mL while the temperature is held constant? (Enter your answer to three significant figures.) Pressure = ? torr

Explanation / Answer

2)
Q = m*C*(Tf-Ti)
= 330 g * 0.40 Cal/goC * (22 - 18) oC
   = 528 cal

Answer: 5.3*10^2 cal

3)
total pressure = pO2 + pHe
6.43 atm = 0.61 atm + pHe
pHe = 5.82 atm
Answer: 5.8 atm

I am allowed to answer only 1 quetion at a time

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