3 years ago

Which of these is NOT a point of the Kinetic-Molecular theory?

Chemistry

1 answer:

vodka [1.7K]3 years ago

3 0

Answer: Gas molecules are pulled together by inter-molecular forces.

Explanation:

One of the postulate of the Kinetic Molecular Theory of gas state that, there are no force of attraction or repulsion between gas molecules.

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58.0 g of K2SO4 was dissolved in 500 g of water. What is the molality of this solution?

podryga [215]

Answer: The molality of solution is 0.66 mole/kg

Explanation:

Molality of a solution is defined as the number of moles of solute dissolved per kg of the solvent.

$Molarity=\frac{n\times 1000}{W_s}$

where,

n = moles of solute

$W_s$ = weight of solvent in g

moles of $K_2SO_4$ = $\frac{\text {given mass}}{\text {Molar Mass}}=\frac{58.0g}{174g/mol}=0.33mol$

Now put all the given values in the formula of molality, we get

$Molality=\frac{0.33\times 1000}{500g}=0.66mole/kg$

Therefore, the molality of solution is 0.66 mole/kg

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Well your mass wont change...so it would be 35 grams of a liquid

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