You need to know the molar mass for Ca which is: 40.078 g/mol and avrogadros # or whatever which is: 6.022 x 10^23
So:
80.0g Ca x (1 mol Ca / 40.078 g Ca) = 1.996 mol Ca (this eliminated grams)
1.996 mol Ca x (6.022 x 10^23 atoms / 1 mol Ca) = 1.202 x 10^24 atoms of calcium
Just remember the fraction 6.022 x 10^23 atoms / 1 mol ! It's the same thing so you can flip it!
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First find how many moles are in 80.45g of Mg. The molecular weight of Mg is 24.305g (found on the Periodic Table) so there is one mol per 24.305g of Mg. 80.45/24.305=3.310 mol Mg
Once you know the moles of the sample you can use Avagadro's number to find the number of atoms. 6.02x10^23(3.310)=1.993x10^24 atoms of Mg
To find the number of atoms in 80.0 grams of calcium, you first need to determine how many moles of calcium are in 80.0 grams by dividing the mass by the molar mass of calcium, which is approximately 40.08 g/mol. Then, you use Avogadro's number (6.022 x 10^23) to convert moles to atoms.
roughly half a mole or 3.01E23 atoms. This is too easy! Didn't even need a calculator, did it in my head.
800 grams is equal to approximately 28.22 ounces.
There are approximately 4 cups of dry beans in 800 grams.
There are approximately 7 cups in 800 grams of all-purpose flour.
There are 453.6 (rounded up) grams in every pound, so in order to find out how many pounds are in 800 grams, we need to divide 800 by 453.6. The resulting answer is 1.76lbs (also rounded). So 800/453.6 = 1.76. Another way to find out how many pounds are in 800 grams would be to multiply 800 times the amount of pounds in one single gram. This number is 0.00220462. So 800*0.00220462 = 1.76.
To find the fraction of a kilogram that 800 grams represents, we need to convert 800 grams to kilograms. Since 1 kilogram is equal to 1000 grams, 800 grams is equal to 0.8 kilograms. Therefore, 800 grams is equivalent to 8/10 or 4/5 of a kilogram.