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ale4655 [162]
3 years ago
12

The temperature of a substance _______ as its heat of fusion is added to melt the substance. A. increases B. remains constant C.

decreases D. fluctuates from rapid increases and decreases
Chemistry
2 answers:
Alexeev081 [22]3 years ago
6 0
The answer would be B. remains constant.
marshall27 [118]3 years ago
4 0

Answer: Option (B) is the correct answer.

Explanation:

Heat of fusion is defined as the heat energy required to convert a solid substance in liquid state.

So, when we heat a solid substance then the heat absorbed by it helps in breaking of intermolecular forces of attraction. As a result, solid substance will start to melt and during this change the temperature remains constant until the substance completely melts which is known as latent heat of fusion.

Hence, we can conclude that the temperature of a substance remains constant as its heat of fusion is added to melt the substance.

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How many formula units are there in 450 g of Na2S04?
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Formula units in 450 g of Na_{2} So_{4} is 1.93 × 10²⁴ formula units.

<u>Explanation:</u>

First we have to find the number of moles in the given mass by dividing the mass by its molar mass as,

$\frac{450 g}{142.04 g/mol} =  3.2 moles

Now, we have to multiply the number of moles of Na₂SO₄ by the Avogadro's number, 6.022 × 10²³ formula units/mol, so we will get the number of formula units present in the given mass of the compound.

3.2 mol × 6.022 × 10²³ = 1.93 × 10²⁴ formula units.

So, 1.93 × 10²⁴ formula units is present in 450g of Na₂SO₄.

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