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Zigmanuir [339]
2 years ago
6

A pinch of salt has

Chemistry
1 answer:
Inessa [10]2 years ago
3 0

13.29 X 10^{21} moles of NaCl are in a pinch of salt and a pinch of salt has

approximately 3.29x10^{21} formula units of NaCl.

<h3>What are moles?</h3>

The mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12; its symbol is “mol”.

We know that 1 formula unit of sodium chloride has a molar mass of 58.44g/mol

Hence;

Mass of 1 formula unit = 58.44g

Mass of 3.29 x 10^{21} formula units

13.29 x 10^{21} x 58.44g

776.6676 x 10^{21}

Moles =\frac{776.6676 X 10^{21} }{ 58.44g}

Moles = 13.29 X 10^{21}

Therefore;

13.29 X 10^{21} moles of NaCl are in a pinch of salt.

Learn more about moles here:

brainly.com/question/15209553

#SPJ1

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3 years ago
We saw in the calorimeter experiment that the combustion of a fuel is exothermic. what can you then say about the formation of a
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8 0
2 years ago
A 0.0000792 M sample of Compound X in a solvent has an absorbance of 0.341 at 528 nm in a 1.000-cm cuvet. The solvent alone has
natima [27]

Answer:

a) a = 3485 M⁻¹cm⁻¹

b) C = 0,000127 M

Explanation:

Lambert-Beer law says that there is a linear relationship between absorbance and concentration of a chemical substance. The formula is:

A = a×b×C

Where A is absorbance, a is molar absorptivity, b is path length and C is concentration.

a) In the problem Concentration is 0.0000792 M, b is 1,000cm and Absorbance is absorbance of sample-absorbance of blank: 0,341-0,065 = 0,276

Replacing:

0,276 = a×1,000cm×0,0000792M

<em>a = 3485 M⁻¹cm⁻¹</em>

b) As the experiment consist in the same compound in the same solvent, the molar absorptivity will be the same, a = 3485 M⁻¹cm⁻¹, path length will be 1,000cm and absorbance: 0,508-0,065 = 0,443

Replacing:

0,443 = 3485 M⁻¹cm⁻¹×1,000cm×C

<em>C = 0,000127 M </em>

<em></em>

I hope it helps!

8 0
3 years ago
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