Answer:
Divide the given mass by its molar mass to get moles, then multiply times 6.022×1023 molecules 1 mol .
Converting between molecules and moles is done by either multiplying by or dividing by Avogadro's number:
1.To go from moles to molecules, multiply the number of moles by 6.02 x 1023.
2.To go from molecules to moles, divide the numbers of molecules by 6.02 x 1023.
We know that the number of moles is equal to the weight of the substance divided by its molar mass. Therefore, the number of moles in 19.82g of Mg is 0.81 mol.
Explanation:
The pillows because it is larger than paperback books, in this situation just think about which is larger, I pretty sure Andre is not going to hold the boxes in his hand.
hope I helped
Hey there!
A half-life means after a certain amount of time, half of that substance will be gone/changed after that time.
60 hours is 4 half lives because 60 ÷ 15 = 4.
So, the 18g sample will be divided in half 4 times.
18 ÷ 2 = 9
9 ÷ 2 = 4.5
4.5 ÷ 2 = 2.25
2.25 ÷ 2 = 1.125
There will he 1.125g of sodium-24 left after 60 hours.
Hope this helps!
78% nitrogen, 21% oxygen, 0.9% argon, and 0.03% carbon dioxide and small concentrations of other elements. <span />
Answer:
carbon, nitrogen,oxygen,flourine
