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leonid [27]
3 years ago
6

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?

Chemistry
2 answers:
Sidana [21]3 years ago
8 0

Answer:

d.) 1417.7   on edge 2020

Explanation:

hope this helps!

lilavasa [31]3 years ago
5 0

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

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 = \frac{58.44g}{30.2kJ}\times 732.6 kJ = 1417.65 grams of NaCl.

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

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How many grams of H2O will be produced if 750. grams of Fe are produced?
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Answer:

\boxed{\small \sf \: Mass \:  of  \: H_2O =322.2 \: grams}

Explanation:

<em>Given:</em>

Mass of ferous (Fe) produced = 750 gram.

<em>To find:</em>

Mass of water produced= ?

<em>Solution:</em>

<em>Molar mass of Fe is 55.84 gram/</em><em>mol</em>

Let's find out the number of moles of ferous produced.

\small \sf Number  \: of  \: moles  =  \frac{Given  \: mass \:  of \:  substance }{Molar \:  mass \:  of \:  substance}

Substituting the given data in above formula.

\small \sf Number  \: of  \: moles  =   \frac{750}{55.84}

\boxed{\small \sf Number  \: of  \: moles \: of \: Fe= 13.43 \: moles}

Now the given reaction is,

Fe_3O_4 + 4H_2  \rightarrow 3Fe + 4H_2O

  • For every 3 mole of production of Fe, 4 mole of waters are produced.
  • let for 13.43 moles of Fe x moles of H2O will be produced.

now calculate the number of moles of H2O

\sf \: \frac{3}{4}  =  \frac{13.43}{x}  \\  \sf x =  \frac{13.43 \times 4}{3}   \\  \sf x = 17.90 \: moles

\small \boxed{\sf number \: of \: moles \: of  \: H_2O= 17.90 \: moles}

mass of one mole of H2O is 18 gram, so we can calculate mass of 17.90 moles.

\small \sf \: Mass \:  of  \: H_2O = 17.90 \times 18 \\    \boxed{\small \sf \: Mass \:  of  \: H_2O =322.2 \: grams}

<em><u>Thanks for joining brainly community!</u></em>

3 0
2 years ago
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