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Aneli [31]
3 years ago
10

NaCl has a Hfus = 30.2 kJ/mol. What is the mass of a sample of NaCl that needs 732.6 kJ of heat to melt completely? 24.3 g 82.7

g 1,407.1 g 1,417.7 g
Chemistry
2 answers:
alina1380 [7]3 years ago
4 0
Hello.

The answer is  1417.7

Its 1417.7 grams becasue you have  to convert the moles to grams.


<span /><span><span>A mole is the amount of pure substance containing the same number of chemical units as there are atoms in exactly 12 grams of carbon-12 (i.e., 6.023 X 1023).

</span><span>a coherent, typically large body of matter with no definite shape.

Have a nice day</span></span>
brilliants [131]3 years ago
3 0

Answer : The mass of the sample of NaCl will be, 1417.7 grams.

Explanation : Given,

\Delta H_{fusion}=30.2kJ/mol

This means that,

As, 1 mole of sample of NaCl has an enthalpy of fusion = 30.2 kJ

And, 1 mole of NaCl has the mass = 58.44 grams

As, 30.2 kJ of heat is needed for a mass 58.44 grams of NaCl

So, 732.6 kJ of heat will be needed for = \frac{58.44g}{30.2kJ}\times 732.6 kJ=1417.65\approx 1417.7 grams of NaCl.

Hence, the mass of sample of NaCl will be, 1417.7 grams.

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