How many moles of Mg atoms in 75.0 g of Mg?

Explanation:

3.0857848179387

this might help in future https://www.convertunits.com/from/grams+Magnesium/to/moles

1 grams Magnesium to mol = 0.04114 mol

10 grams Magnesium to mol = 0.41144 mol

20 grams Magnesium to mol = 0.82288 mol

30 grams Magnesium to mol = 1.23431 mol

40 grams Magnesium to mol = 1.64575 mol

50 grams Magnesium to mol = 2.05719 mol

100 grams Magnesium to mol = 4.11438 mol

200 grams Magnesium to mol = 8.22876 mol

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what is the average time it took the car to travel 0.25 meters?

⇒ 2.23 seconds

what is the average time it took the car to travel 0.50 meters?

⇒ 3.13 seconds