The recommended daily allowance (RDA) of the trace metal magnesium is 410 mg/daymg/day for males. Express this quantity in μg/da
1 answer:
Answer:
Recommended daily Amount (RDA) of magnesium is 410,000 μg/day.
Explanation:
There are 1000μg in 1 mg and 1000 mg in 1g
1 mg=1000μg
The Recommended daily Amount (RDA) is 410 mg/day of magnesium. Converting 410 mg/day into μg/day
It will become 410,000 μg/day
So Recommended daily Amount (RDA) of magnesium is 410,000 μg/day.
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Explanation:
To find the number of atoms, divide the mass of calcium (m) by its molar mass (MM). This will give you the number of moles of calcium (n).
Start with a formula
Substitute values from the question
Simplify
Cancel out the units "g"
Number of moles of calcium, with 4 significant figures
Then, multiply the number of moles of calcium (n) by Avogadro's number () to find the number of calcium atoms.
Start with a formula
Substitute values from the question
Simplify
Cancel out the units "mol"
Multiply, leave one extra digit to help round. "4" tells you to round down.
Final answer to 3 significant figures*
*When multiplying and dividing numbers, your final answer will have the same number of significant figures as the number with the least number of significant figures in the question.
40.08 has 4 significant figures. 41.0 has 3 significant figures. So, you want 3 significant figures in your final answer.
I hope this helps!
Learn more about Avogadro's number here:
Check out another answer that uses significant figures: