A 0.465 g sample of an unknown compound occupies 245 mL at 298 K ...

[MirandaLo]

A 0.465 g sample of an unknown compound occupies 245 mL at 298 K and 1.22 atm. What is the molar mass of the unknown compound?
 
  A) 26.3 g/mol
  B) 33.9 g/mol
  C) 12.2 g/mol
  D) 38.0 g/mol
  E) 81.8 g/mol

Question 2

What happens to the density of a sample of iron metal as it is heated from room temperature to 100C? (This is below the melting point of iron.)
 
  What will be an ideal response?

[ambernicolefink]

Answer to Question 1

D

Answer to Question 2

Since the mass of the iron stays constant, but the volume increases as the temperature is raised, the density of the iron decreases upon heating.

[MirandaLo]

Thanks for the timely response, appreciate it

[bulacsom]

Wow, this really help