In the following unbalanced reaction of burning butane, how many grams of water are released when 922 g of C4H10 is burned (Hint: you must balance the reaction for the first step)?
C4H10 (g) + O2 (g) → CO2 (g) + H2O (g)

The mass of the sun is 1.99×1030kg and its distance to the earth is 1.50×1011m. what is the gravitational force of the sun on the earth?

Ahypothetical metal has an orthorhombic unit cell for which the a, b, and c lattice parameters are 0.413 nm, 0.665 nm, and 0.876 nm, respectively. (a) if there are 8 atoms per unit cell and the atomic packing factor is 0.536, determine the atomic radius (in nm). (b) if the density is 3.99 g/cm3, calculate the metal's atomic weight (in g/mol).

What is the angular momentum of a hydrogen atom in a 4p state? give your answer as a multiple of ħ.