CaTe CHEM 1111 Sucion Prelab Questions: Apparent Molar Mass of Air 1. What is a

Question

CaTe CHEM 1111 Sucion Prelab Questions: Apparent Molar Mass of Air 1. What is a molar mass (of a compound)? What are its units? 2. What is the equation for the ideal gas law? What units are typically used? [Hint pressures are typically measured as atmospheres or torr.] 3. Rearrange the ideal gas law to solve for moles (n). 4. If an Erlenmeyer flask assembly containing air has a mass of 138.562 g at 25.5°C and 138.541 g when submerged in boiling water at 99.70C, calculate the molar mass of air if the barometric pressure is 1.032 atm and the volume of the flask is 145.0 mL. Show your work

Explanation / Answer

Q1

molar mass --> how much mass does 1 mol of any species occupy

the units are grams per gmol (g/mol)

Q2

Apply Ideal Gas Law,

PV = nRT

where

P = absolute pressure, atm

V = total volume of gas, Liter

n = moles of gas, mol

T = absolute Temperature, K

R = ideal gas constant; Latm/(molK)

Q3

PV= nRT

n = PV/(RT)

Related Questions

Navigate

• Browse (All)
• Browse C
• Subjects

---