Is polyurethane foam and polystyrene absorbing or releasing heat?

If a 60-g object has a volume of 30 cm3, what is its density? 2 g/cm3 0.5 cm3/g 1800 g * cm3 none of the above

According to the vsepr theory what is the shape of a molecule that has a central atom valence three other items with no lone pairs of electrons

How many moles are in 1.26*10^24 particles in significant figures