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Romashka [77]
3 years ago
10

If a chemist has 2.3 moles of arsenic that has a molar mass of 74.92g/mol, which would be the best way to find out how many atom

s of arsenic are in the sample?
Multiply 2.3 bu the molar mass of arsenic.

Divide 2.3 by the molar mass of arsenic.

Multiply 2.3 by Avogadro's number.

Divide 2.3 by Avogadro's number.
Chemistry
2 answers:
Firlakuza [10]3 years ago
6 0
<h3>Answer:</h3>

              Multiply 2.3 by Avogadro's Number

<h3>Explanation:</h3>

                     As we know that 1 mole of any substance contains exactly 6.022 × 10²³ particles which is also called as Avogadro's Number. So in order to calculate the number of particles (Atoms) contained by 2.3 moles of Arsenic (As), we will use following relation,

           Moles  =  Number of Atoms ÷ 6.022 × 10²³ Atoms.mol⁻¹

Solving for Number of Molecules,

           Number of Atoms  =  Moles × 6.022 × 10²³ Atoms.mol⁻¹ **

(**<u><em>This is your answer</em></u>)

Putting values,

           Number of Atoms  =  2.3 mol × 6.022 × 10²³ Atoms.mol⁻¹

           Number of Atoms  =  1.38 × 10²⁴ Atoms

Hence,

           There are 1.38 × 10²⁴ Atoms present in 2.3 moles of Arsenic.

scZoUnD [109]3 years ago
4 0
Mulitply 2.3 by avogadros #
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Serga [27]

Answer:

<h2>8</h2>

Explanation:

The pH of a solution can be found by using the formula

pH = - log [ {H}^{+} ]

From the question we have

ph  =  -  log(1 \times  {10}^{ - 8}  )  \\  = 8

We have the final answer as

<h3>8 </h3>

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<h3>Answer:</h3>

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<h3>Explanation:</h3>
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