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3 years ago

The mass of an electron is

Chemistry

2 answers:

pishuonlain [190]3 years ago

5 0

Answer:

D less mass than a neutron

m_a_m_a [10]3 years ago

5 0

Protons have a mass of 1.67x10⁻²⁴ g

neutrons have a mass of 1.675x10⁻²⁴ g

electrons have a mass of 9.1x10⁻²⁸ g

So The mass of an electron is D.less than the mass of a neutron

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2 years ago

A reaction of 41.9 g of Na and 30.3 g of Br2 yields 36.4 g of NaBr . What is the percent yield?

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Answer: The percent yield is, 93.4%

Explanation:

First we have to calculate the moles of Na.

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Now we have to calculate the moles of $Br_2$

${\text{Moles of}Br_2} = \frac{\text{Mass of }Br_2 }{\text{Molar mass of} Br_2} =\frac{30.3g}{160g/mole}=0.189moles$

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The balanced chemical reaction is,

$2Na(s)+Br_2(g)\rightarrow 2NaBr$

As, 1 mole of bromine react with = 2 moles of Sodium

So, 0.189 moles of bromine react with = $\frac{2}{1}\times 0.189=0.378$ moles of Sodium

Thus bromine is the limiting reagent as it limits the formation of product and Na is the excess reagent.

As, 1 mole of bromine give = 2 moles of Sodium bromide

So, 0.189 moles of bromine give = $\frac{2}{1}\times 0.189=0.378$ moles of Sodium bromide

Now we have to calculate the percent yield of reaction

$\%\text{ yield}=\frac{\text{Actual yield}}{\text{Theoretical yield}}\times 100=\frac{0.353 mol}{0.378}\times 100=93.4\%$

Therefore, the percent yield is, 93.4%

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3 years ago