Most fertilizers are rich in nitrogen and phosphorous because they have to replenish nitrogen and phosphorous in the soil, which are essential for plant growth. If they didn't have this, the soil would have to wait fro another cycle and this would hinder plant growth. The correct answer is C.
The piece of metal is unaffected, it hasnt changed elements or react in a way that would change the general make-up of the metal.
Simple terms: its still a piece of metal, just bent in half (ू• ౪•ू ) hope this helped!
Answer:
0.640 Torr; 1.28 Torr
Step-by-step explanation:
According to <em>Raoult's Law,
</em>
(1) p₁ = χ₁p₁°,
where p₁ is the solvent
χ₁ + χ₂ = 1 Subtract χ₁ from each side
χ₂ = 1 – k₁ Substitute in (1)
(2) p₁ = (1 – χ₂)p₁° Remove parentheses
p₁ = p₁°- χ₂p₁° Subtract p₁° from each side
p₁ - p₁° = -χ₂p₁° Multiply each side by -1
Δp = χ₂p₁°
Δp is the vapour pressure lowering.
If the solute is an electrolyte, we must insert the <em>van't Hoff i factor.</em>
ΔP = iχ₂P₁°
===============
(1) Calculate χ₂ for each solution
Water:
1000 g = 1000 × 1/18.02
= 55.49 mol
χ₂ = 2.10/(2.10 + 55.49)
= 2.10/57.59
= 0.036 46
===============
(2) Calculate the vapour pressure lowering
(a) Sucrose
i = 1
ΔP = 1 × 0.036 46 × 17.54
ΔP = 0.640 Torr
=====
(b) NaCl
i = 2
ΔP = 2 × 0.640
ΔP = 1.28 torr