hurry please chemistry!!?

[j.investi]

CaC2 + 2 H2O --> C2H2 + Ca(OH)2

a) mole of CaC2 = 479 / 64 = 7.484 mol
mole of H2O needed = 2/1 * mole of CaC2 = 14.968 mol [ratio of coefficients = ratio of moles]
mass of H2O needed = 14.968 * 18 = 269.424 g

b) mole of C2H2 = 23.6 / 26 = 0.908 mol
mole of CaC2 needed = 1/1 * mole of C2H2 = 0.908 mol
mass of CaC2 needed = 0.908 * 64 = 58.112 g

c) mole of Ca(OH)2 = 51.3 / 74 = 0.693 mol
mole of H2O = 2/1 * mole of Ca(OH)2 = 1.386 mol
mass of H2O = 1.386 * 18 = 24.948 g

[hotpinkrazr3]

Calcium carbide, CaC2, reacts with water to form acetylene.
CaC2(s) + 2 H2O(l) C2H2(g) + Ca(OH)2(s)
(a) How many grams of water are needed to react with 479 g of calcium carbide?
(b) How many grams of CaC2 could make 23.6 g C2H2?
(c) If 51.3 g Ca(OH)2 are formed, how many grams of water reacted?