3 years ago

What is the answer pllleeaasseeeee?????

Chemistry

1 answer:

kenny6666 [7]3 years ago

3 0

I will try my best to sovle this question...

Im Pretty sure it has to be A. it needs to balance it would not stand in place if not balanced.

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4 years ago

Copper has two naturally occurring isotopes, 63Cu (isotopic mass 62.9296 amu) and 65Cu (isotopic mass 64.9278 amu). If copper ha

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Answer:

Percentage of first isotope = 69.152 %

Percentage of second isotope = 30.848 %

Explanation:

The formula for the calculation of the average atomic mass is:

$Average\ atomic\ mass=(\frac {\%\ of\ the\ first\ isotope}{100}\times {Mass\ of\ the\ first\ isotope})+(\frac {\%\ of\ the\ second\ isotope}{100}\times {Mass\ of\ the\ second\ isotope})$

Given that:

For first isotope:

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For second isotope:

% = 100 - x % (Since, there are only two isotopes)

Mass = 64.9278 amu

Average mass = 63.546 amu

Thus,

$63.546=\frac {x}{100}\times {62.9296}+\frac {(100-x)}{100}\times {64.9278}$

Solving,

1.9982 x = 138.18

Thus,

<u>Percentage of first isotope = x = 69.152 %</u>

<u>Percentage of second isotope = 100 - x % = 30.848 %</u>

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4 years ago

Electrons are known to be to the smallest subatomic particle

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3 years ago

An _________ occurs when a chemical reaction releases a large amount of energy very quickly

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What chemical reaction is A+ B —>AB

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Whenever two or more substances combine to form one single compound, a combination reaction is said to have occurred.

Hence, since the reactants A and B combined to yield one single product AB, it is a combination reaction.

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