Answer: -
5 : 1 : 3
Explanation: -
Mass of CO₂ = 2.2 g
Molar mass of CO₂ = 44 g / mol
Number of moles of CO₂ =
=
= 0.05 mol
Number of atoms of nitrogen = 6.02 x 10²¹
Number of moles of nitrogen =
=
= 0.01 mol
0.03 gram atom of sulphur means 0.03 moles of sulphur.
Thus the mole ratio of CO₂ : N : S = 0.05 : 0.01 : 0.03
= 5 : 1 : 3
Answer: 0.17 m : Highest freezing point
0.20 m : Second lowest freezing point
0.18 m : Third lowest freezing point
0.42 m ethylene glycol: Lowest freezing point
Explanation:
Depression in freezing point is a colligative property which depend upon the amount of the solute.
where,
= change in freezing point
i= vant hoff factor
= freezing point constant
m = molality
a) 0.17 m
For electrolytes undergoing complete dissociation, vant hoff factor is equal to the number of ions it produce. Thus i =2 for , thus total concentration will be 0.34 m
b) 0.18 m
For electrolytes undergoing complete dissociation, vant hoff factor is equal to the number of ions it produce. Thus i = 2 for , thus total concentration will be 0.36 m
c) 0.20 m
For electrolytes undergoing complete dissociation, vant hoff factor is equal to the number of ions it produce. Thus i = 2 for , thus total concentration will be 0.40 m
d) 0.42 m ethylene glycol
For non electrolytes undergoing no dissociation, vant hoff factor is equal to 1 . Thus i = 1 for ethylene glycol, thus concentration will be 0.42 m
The more is the concentration, the highest will be depression in freezing point and thus lowest will be freezing point.
Explanation:
The density of a substance can be found by using the formula
From the question
mass of block = 5 g
volume = 15 mL
The density of the block is
We have the final answer as
<h3>0.33 g/mL</h3>The block will float on water since it's density is less than that of water which is 1 g/mL
Hope this helps you