Question

1. How many grams of water will be
produced by complete combustion of 12
g of methane gas
a. 16 b. 27
d. 56
2. Two elements A (At. mass 75) and B (At.
mass 16) combine to give a compound
having 75.8 % of A. The formula of the
compound is
a. AB
b. A,B
c. AB,
d. A,B,​

Answer 1

Answer:

1. 27 grams

2. There are two elements in the compound, X and Y. Atomic mass of X = 75. Atomic mass of Y = 16. Percentage of Y = (100 – 75.8) % = 24.2 %.