Classify he and h2 are element compound or mixture

What is the mass of 0.46 mol of mgcl2

The density of the solid phase of a substance is 0.90 g/cm3 and the density of the liquid phase is 1.0 g/cm3. a large increase in pressure will a. lower the freezing point b. raise the freezing point c. lower the boiling point d. raise the triple point e. lower the triple point

What happens in the particles of a gas when the gas is compressed