Which coefficients correctly balance the formula equation below? kclo3(s) --> kcl(s) + o2(g)

a) 1,1,1

b) 1,1,3

c) 2,2,3

d) 2,1,1

Idon’t know how to solve this question

If a solution is considered basic, then a) the hydroxide ion and hydronium ion concentrations are equal. b) the hydroxide ion concentration is less than the hydronium ion concentration. c) the hydronium ion concentration is greater than the hydroxide ion concentration. d) the hydroxide ion concentration is greater than the hydronium ion concentration.

If 90.0 grams of ethane reacted with excess chlorine,how many grams of dicarbon hexachloride would form