3 years ago

Which of the following is used in pencils?

Chemistry

2 answers:

goldenfox [79]3 years ago

8 0

Answer:

the first is graphite........

Mamont248 [21]3 years ago

3 0

Answer:

1st answer: A. Graphite

2nd answer: B. Mercury

Explanation:

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Calculate the mass percent (m/m) of a solution prepared by dissolving 51.56 g of NaCl in 164.2 g of H2O. Express your answer to

denis-greek [22]

Answer:

"23.896%" is the right answer.

Explanation:

The given values are:

Mass of NaCl,

= 51.56 g

Mass of H₂O,

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As we know,

⇒ Mass of solution = $Mass \ of \ (NaCl+H_2O)$

= $51.56+164.2$

= $215.76 \ g$

hence,

⇒ $Mass \ percent =\frac{Mass \ of \ NaCl}{Mass \ of \ solution}\times 100$

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$=23.896 \ percent$

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