How many moles of magnesium is 1.25 x 1023 atoms of magnesium?

Think a little more..

you have 1.25e23 atoms, and there are 6.02e23 atom in one mole. dividing the first by the second yields 2.08e-1 mol Mg

1.25(10^23) divided by 6.02(10^23)

the scientific notations cancel each other out and then we're only left with the numbers 1.25/6.02 which equals 0.208 rounded to the thousandth
0.208 = 2.08(10^-1) because negative notations means moving the decimal point to the left

2.08

2.08 moles of Mg

I HATE YOU ALL. MS. SUE IS THE ONLY PERSON WHO CAN CORRECTLY ANSWER QUESTIONS.I GOT IT WRONG

How many atoms are in 5 moles of carbon/c?

To determine the number of moles of magnesium, you need to use Avogadro's number and the conversion factor. Avogadro's number represents the number of atoms or particles in one mole. It is approximately 6.022 × 10^23.

The given question states that there are 1.25 × 10^23 atoms of magnesium. To convert this into moles, you divide the number of atoms by Avogadro's number.

1.25 × 10^23 atoms of magnesium / 6.022 × 10^23 atoms/mol = 0.207 moles of magnesium

So, the correct answer is A. 0.208 × 10^1 mol Mg.