Pls help - 30 Points In an experiment, potassium chlorate decomposed according to the following chemical equation.

KClO3 → KCl + O2

(Molar mass of KClO3 = 122.5 g/mol; KCl = 74.55 g/mol; O2 = 31.998 g/mol)

If the mass of potassium chlorate was 240 grams, which of the following calculations can be used to determine the mass of oxygen gas formed?

A. (240 × 2 × 31.998) ÷ (122.5 × 3) grams
B. (240 × 3 × 31.998) ÷ (122.5 × 2) grams
C. (240 × 2 × 122.5) ÷ (31.998 × 3) grams
D. (240 × 3 × 122.5) ÷ (31.998 × 2) grams

Which of the following statements is true about planck’s law

How many grams of n2h4 will be consumed by 23 g of n2o4

Achemist wants to extract copper metal from copper chloride solution. the chemist places 0.50 grams of aluminum foil in a solution containing 0.75 grams of copper (ii) chloride. a single replacement reaction takes place. (ii) chloride. a single replacement reaction takes place. which statement explains the maximum amount of copper that the chemist can extract using this reaction? a) approximately 0.36 grams, because copper (ii) chloride acts as a limiting reactant b) approximately 1.8 grams, because copper (ii) chloride acts as a limiting reactant c) approximately 0.36 grams, because aluminum acts as a limiting reactant d) approximately 1.8 grams, because aluminum acts as a limiting reactant