Question

Q34.(A) Give the names of the elements present in the following compounds:
(a) Quick lime(b) Hydrogen bromide
(c) Baking powder
(B) Convert inte mole
(a) 12 g of oxygen gas
(b) 20 g of water​

Answer 1

Answer:

quick lime ça(OH)2 Hydrogen bromide H2br

Answer 2

Answer

A.(a).CaO

(b).HBr

(c)NaHCO3

B.(a)0.375 moles

(b)1.111 moles

Explanation:

A.(a).calcium and oxygen.

(b).hydrogen and bromine

(c).sodium,hydrogen,carbon and oxygen

B.(a)Molecular weight of oxygen in grams=32g of oxygen=one mole of oxygen gas

Thus,12g of oxygen=1/32×12=0.375 moles

(b).Molecular weight of water in grams 2+16=18g =one mole of water

Thus,20g of water=1/18×20=1.111 moles