Question

NaCl has a mc020-1.jpgHfus = 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

Answer 1

the answer is D

Step-by-step explanation:

I took the quiz on egde and made a 100% good luck lil homies!

(the other person explained it better so creds to them)

Answer 2

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

Step-by-step explanation:

We are given:

`\Delta H_(fusion)=30.2kJ/mol`

This means that 1 mole of NaCl has an enthalpy of fusion of 30.2 kJ

1 mole of NaCl has a mass of 58.44 grams.

So, 30.2 kJ of heat is require for a mass 58.44 grams of NaCl

So, 732.6 kJ of heat will be required for =
`(58.44g)/(30.2kJ)* 732.6 kJ` = 1417.65 grams of NaCl.

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