Frank has a sample of steel that weighs 80 grams. if the density of his sample of steel is 8 g/cm3, what is the sample’s volume?

Can someone me with 1 to 4 plz. fast

What is the independent variable in this investigation? mass volume sample number substance density

One of the hopes for solving the world's energy problem is to make use of the fusion reaction 21h +31h --> 42he + 10n + energy how much energy is released when 1 mol of deuterium is fused with 1 mol of tritium according to the above reaction? the masses of the atoms and the neutrons are as follows: 21h = 2.0140 amu 31h = 3.01605 amu 42he = 4.002603 amu 10n = 1.008665 amu. the speed of light is 2.9979 x 108 m/s.