28.Name, (i) liquid X, (ii) gas Y and (iii) gas Z. *
(i) H2O (ii) H2 (iii) O2
(i) H2O (ii) O2 (iii)H2
(i) H2 (ii) O2 ( iii )H2O
(i)CO2 (ii) C ( iii) O2
What is the ratio of the mass of element Z to the mass of element Y in the liquid X? *
1 : 8
8 : 1
2 : 1
1 : 2
Answers
Answer:
Balanced equation:
X
⟶
Y
+
Z
(a). X is a natural source, and all the animals and plants need liquid then Molar mass of X is 18 unit or 18 grams.
So the compound X is water, that is
H
2
O
The decomposition reaction of
H
2
O
produces
O
2
and H2 gas. Gas
O
2
is produced the positive electrode whereas gas
H
2
is obtained at the negative electrode.
Therefore, the compound Y is oxygen gas, that is
O
2
and the compound Z is Hydrogen gas, that is
H
2
. Because gas
O
2
supports combustion whereas gas
H
2
burns itself causing explosions.
Balanced equation:
2
H
2
O
⟶
O
2
+
2
H
2
(b). The molar mass of
H
2
O
is 18 g/mol. In that,
The mass of
H
2
= 2.016 g/mol or simply 2 g/mol. (Because Atomic mass of H is 1.008 g/mol)
The atomic mass of O = 16 g/mol.
The mass ratio of Z: Y or H: O in the liquid X or
H
2
O
is 2: 16 or 1: 8
(c). The Law of Definite Proportions.
(d). River, Rain
(e). Cellular respiration: Oxygen is the vital gas responsible for life on earth. Earths mammals, along with many other species, require oxygen to survive.