How many moles are in 4.24kg of na2co3?

hint : you need to convert from kg to grams first
a. 4.00 x 10 -2 moles
b. 40.0 moles
c. 4.49 x 105 moles
d. 2.55 x 1028 moles

If 1.63 times 10 negative 4 of helium dissolves in 100.0g of water, what is the concentration in parts per million

Consider the reaction of a(g) + b(g) + c(g) => d(g) for which the following data were obtained: experiment initial [a], mol/l initial [b], mol/l initial [c], mol/l initial rate, mol/l.s 1 0.0500 0.0500 0.0100 6.25 x 10^-3 2 0.100 0.0500 0.0100 2.50 x 10^-2 3 0.100 0.100 0.0100 1.00 x 10^-1 4 0.0500 0.0500 0.0200 6.25 x 10^-3 what is the rate law for the reaction?

Which three statements represent the benefits of performing experiments using computer simulations?