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Q:A:### Quick Answer

**Percent abundance can be calculated by finding the percentage of an isotope compared to another isotope of an element using its relative atomic mass.** This is an algebraic process and depends upon several measurements.

Because there are various isotopes of an element, its atomic weight is a calculation of the atomic masses and relative abundances of each isotope of that element. Using algebra, the atomic weights and respective relative abundance percentages of each isotope are multiplied and then added together to find the atomic weight of the element in question.

To accurately measure the atomic mass of an element, a mass spectrometer is used. In this instrument, atoms are positively ionized, accelerated and then deflected by a magnetic field. The amount of deflection is partially determined by the element's atomic mass.

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## What is the formula to calculate case-mix index?

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Full Answer >**A case-mix index is calculated by first choosing a period of time, such as a year.**The hospital procedures should then be placed in diagnosis-related groups that the hospital billed, and the relative numeric weights should be gathered. Divide the sum of relative weights with the total diagnostic-related groups.Filed Under: - Q:
## How much would a 15 dollar shirt cost if it was 20 percent off?

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Full Answer >**A $15 shirt would cost $12 if it were 20 percent off.**The 20 percent discount would come to $3, and subtracting $3 from $15 gives $12.Filed Under: - Q:
## What is the formula used to find percent recovery?

A:When purifying a substance in chemistry, use (collected mass/starting mass)*100 to calculate percent recovery. This formula is also commonly stated as (pure product recovered/crude material used)*100.

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## How do you calculate percent of change?

A:The percentage of change can be calculated by using one of two formulas. The percentage of increase, or positive change, can be calculated as follows: increase ÷ original number × 100. The percentage of decrease, or negative change, can be calculated according to the following formula: decrease ÷ original number × 100.

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