What is the difference between the number of moles of atoms and the number of atoms?? I thought moles and atoms were the same thing! Like, for this problem: compute both the number of moles of atoms and the number of atoms in a 10-g sample of aluminumWouldn't both answers be .307? I'm soo confused!!
Find a wooden rod the diameter of the inside of the pipe and force it inside
I like both ideas so farAnother option is to look in your used sales adsQuite often there is a nice selection at a reasonable priceThis can make repairs uneconomical.
One mole is approximately 6.022 x 10?? (6.022 x 10^23)This number is called Avogadro's numberYou multiply the number of moles by Avogadro's number to get the number of atomsA mole is like a dozen (12) or a pair (2)If I buy two dozen eggs that is the same thing as buying 24 (2 x 12) eggsIf I have two pairs of shoes I have four individual shoesYou can count anything in molesNormally it's used by chemists to count atoms, ions and molecules, but you could just as easily talk about one mole of shoes (6.022 x 10^23 shoes) or one mole of eggsThis is not a totally random numberIt is approximately equal to the number of atoms of carbon-12 found in a 12 gram sample (the atomic mass of carbon is 12 g/mol)To find out the number of moles of Al in 10 g you use the atomic mass, which is 26.98 g/mol (your textbook or periodic table may have a slightly different value) 10 g Al x (1 mol Al / 26.98 g Al) (10 / 26.98) mol ≈ 0.37 mol Now you multiply this by Avogadro's number0.37 mol x (6.022 x 10^23) ≈ 2.23 x 10^23 atoms As a general rule you should not round until you are done with all of your calculationsI was a little lazy and rounded the atomic mass of aluminum to two decimal places (from 26.981538) and also rounded to 0.37 molesDifferent instructors have different expectations.
Find a wooden rod the diameter of the inside of the pipe and force it inside
I like both ideas so farAnother option is to look in your used sales adsQuite often there is a nice selection at a reasonable priceThis can make repairs uneconomical.
One mole is approximately 6.022 x 10?? (6.022 x 10^23)This number is called Avogadro's numberYou multiply the number of moles by Avogadro's number to get the number of atomsA mole is like a dozen (12) or a pair (2)If I buy two dozen eggs that is the same thing as buying 24 (2 x 12) eggsIf I have two pairs of shoes I have four individual shoesYou can count anything in molesNormally it's used by chemists to count atoms, ions and molecules, but you could just as easily talk about one mole of shoes (6.022 x 10^23 shoes) or one mole of eggsThis is not a totally random numberIt is approximately equal to the number of atoms of carbon-12 found in a 12 gram sample (the atomic mass of carbon is 12 g/mol)To find out the number of moles of Al in 10 g you use the atomic mass, which is 26.98 g/mol (your textbook or periodic table may have a slightly different value) 10 g Al x (1 mol Al / 26.98 g Al) (10 / 26.98) mol ≈ 0.37 mol Now you multiply this by Avogadro's number0.37 mol x (6.022 x 10^23) ≈ 2.23 x 10^23 atoms As a general rule you should not round until you are done with all of your calculationsI was a little lazy and rounded the atomic mass of aluminum to two decimal places (from 26.981538) and also rounded to 0.37 molesDifferent instructors have different expectations.
