Questions regarding volume after evaporating and lever equilibrium

[Bublifuk]

Hello.
I am preparing for certain exams and I encountered these question. Can you guys help me to solve these ones?

The 1st one I tried to apply formula about density (p=m/v), but I guess that I need to solve through that ice cube. That I firstly sort out the number of atoms in ice cube and then I'll convert it into steam? I have no idea how to solve it.

The second one is mostly about lever system. I tried to use the formula (m=fd), but i don't know how to put figures into it to make it stable. Does anyone have an idea?


Thanks a lot!

 

[Bublifuk]

for those who concerned I solved the second one:
it's=
1000 x 1.5 = 100 x 4.5 + 1.5x
x=700N

I hope somebody will help me with the first one:)

 

[haruspex]

What is the molecular mass of ice?
What is the mass of one mole of ice?
How many moles in the cube?
What volume would that many moles of a gas occupy at room temperature and pressure?
What volume would it then occupy at room pressure but 100C?