According to Raoult's low:
We will use this formula: Vp(Solution) = mole fraction of solvent * Vp(solvent)
∴ mole fraction of solvent = Vp(Solu) / Vp (Solv)
when we have Vp(solu) = 25.7 torr & Vp(solv) = 31.8 torr
So by substitution:
∴ mole fraction of solvent = 25.7 / 31.8 =0.808
when we assume the moles of solute NaCl = X
and according to the mole fraction of solvent formula:
mole fraction of solvent = moles of solvent / (moles of solvent + moles of solute)
by substitute:
∴ 0.808 = 0.115 / (0.115 + X)
So X (the no.of moles of NaCl) = 0.027 m
Answer:
2 Mg + O2 → 2 MgO b. From the reaction in the previous question, how many moles of oxygen are needed to completely react with 12 moles of magnesium.
Explanation:
hope this helps
a) (10.12 g salt) x [(1 mole salt)/(277.85 g salt)] x [(1)/(2.000 L soln)] = 0.0182 M
b) (0.0182 M) x [(1 mole Mg2+)/(1 mole salt)] = 0.0182 M
c) (0.0182 M) x [(3 moles Cl-)/(1 mole salt)] = 0.0546 M
d) [(10.12 g salt)/(2000 mL)] x 100% = 0.506% (w/v)
e) (0.0546 M Cl-)(25.0 mL soln) = 1.36 mmoles Cl-
f) [(0.0182 moles K+) / (1.000 L)] x [(39.10 g K+)/(1 mole K+)] x [(1 L soln)/(1000 g soln)] x (1x10^6) = 712 ppm
Answer:
Explanation:
Given density of chloroform is 1.48 g/mL
We need to find the density in 
Also, we have given 2.54 cm = 1 in and 2.205 lb = 1 kg
We know 
Also, 2.54 cm = 1 in
And 1000 g = 1 kg
Now we will plug
So,
The answers to include the following below:
- Hot water has more energy than cold water because it has more internal energy present in it.
- The relationship between temperature and the movement of particles is a direct one which means that as temperature increases, the movement of particles also increases and vice versa.
- The temperature of a substance is directly proportional to the average kinetic energy of the substance which makes their relationship a direct one.
- Water is referred to as pure substance because it contains only one type of molecule.
<h3>What is Temperature?</h3>
This is described as the measure of the hotness or coldness of a substance and is influenced by heat energy.
Temperature has a direct relationship with average kinetic energy and movement of particles which means that an increase in one variable will also lead to a corresponding increase in the other.
This is the therefore the reason why the above answers are correct and the most appropriate.
Read more about Temperature here brainly.com/question/2331658
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