Going down for something to build up
Answer: -
10.5% is the Weight / weight % or percent by mass of sodium sulfate
Explanation: -
Mass of sodium sulfate = 11.2 g
Mass of water = 95.0 g
Total mass of the solution = Mass of sodium sulfate + Mass of water
= 11.2 + 95.0 = 106.2 g
Weight / weight % or percent by mass of the solute = (Mass of sodium sulfate / Total mass of the solution) x 100
= ![\frac{11.2}{106.2} x 100](https://tex.z-dn.net/?f=%20%5Cfrac%7B11.2%7D%7B106.2%7D%20x%20100%20)
= 10.5 correct to 3 significant figures.
ΔHrxn of equation I = -123.5 kJ
<h3>Further explanation</h3>
Complete question :
Reaction 1 :
PCl₃ + Cl₂ → PCl₅
Reaction 2 :
P₄ + 6Cl₂ → 4PCl₃ ΔH = −1280 kj
Reaction 3 :
P₄ + 10Cl₂ → 4PCl₅ ΔH = −1774 kj
Based on the principle of Hess's Law, <em>the change in enthalpy of a reaction will be the same even though it is through several stages or ways </em>
Reverse reaction 2 :
4PCl₃ ⇒ P₄ + 6Cl₂ ΔH = +1280 kj (sign change)
Add to reaction 3 :
4PCl₃ ⇒ P₄ + 6Cl₂ ΔH = +1280 kj
P₄ + 10Cl₂ ⇒ 4PCl₅ ΔH = −1774 kj
-------------------------------------------------------- +
Canceled the same compound in the different side :
4PCl₃ + 4Cl₂ ⇒ 4PCl₅ ΔH = -494 kJ ⇒divide by 4
PCl₃ + Cl₂ ⇒ PCl₅ ΔH = -123.5 kJ
Answer:
They are all physical exept c
Explanation: