3 years ago

PLZ HELP, GIVING BRAINIEST!! How many moles are there in 1.90g of Arsenic? Show work, please.

1 answer:

3 0

Answer: 2.53 x 10^-2 moles As ( the answer is in scientific notation )

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DENIUS [597]

Answer: Its average atomic mass is 114.9 amu

Explanation:

Mass of isotope 1 = 113 amu

% abundance of isotope 1 = 5% = $\frac{5}{100}=0.05$

Mass of isotope 2 = 115 amu

% abundance of isotope 2 = 95% = $\frac{95}{100}=0.95$

Formula used for average atomic mass of an element :

$\text{ Average atomic mass of an element}=\sum(\text{atomic mass of an isotopes}\times {{\text { fractional abundance}})$

$A=\sum[(113\times 0.05)+(115\times 0.95)]$

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Thus its average atomic mass is 114.9 amu

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3 years ago