How/what do I answer this?--> "heat of the chemical reactions" like this is the question :/
1 answer:
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Answer:
82.1
Explanation:
Isotopes of the same element are atoms of the same element (so, having same number of protons) having a different number of neutrons (and so, a different atomic mass).
In this problem, this element has 3 different isotopes, with atomic mass (in atomic mass units, a.m.u.) and relative abundance listed below:
1) 78.9 12.6%
2) 80.9 13.9%
3) 82.9 73.5%
In order to calculate the relative atomic mass unit of this element, we have to calculate the weighed average of the relative atomic mass of each isotope.
This means that we can calculate it as the sum of each atomic mass unit multiplied by the relative frequency:
where is the atomic mass of each isotope and
the relative frequency. Therefore, we find:
Answer:
Explanation:
We are asked to calculate the density of gold. The density of a substance is its mass per unit volume. It is calculated using the following formula.
The mass of the sample is 96.5 grams. The volume of the sample is 5.00 cubic centimeters.
- m= 96.5 g
- v= 5.00 cm³
Substitute the values into the formula.
Divide.
The density of gold is <u>19.3 grams per cubic centimeter.</u>