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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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## How is the structural strength of steel calculated?

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Full Answer >**The structural strength of steel is calculated by measuring the pounds of applied force through the direct method or the effective width method.**The calculated equation provides the yield strength of the steel.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.

Full Answer >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:
## 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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