Sodium has a density of 1.95/cm3 what is the volume of 56.2g of sodium

Ineed this asap part i: scientific method what is the difference between science and pseudoscience? what is the scientific method?

For the reaction shown, find the limiting reactant for each of the following initial amounts of reactants. 4al(s)+3o2(g)→2al2o3(s) a) 1 molal, 1 mol o2 b) 4 molal, 2.6 mol o2 c) 16 molal, 13 mol o2 d) 7.4 molal, 6.5 mol o2

Convert the temperature of dry ice, –77 ∞c, into degrees fahrenheit and kelvin.