118.7 is close to the 118.96 grams per mole (mass) of tin. So we can call that one mole. 1 mole is equal to 6.022x10^23 (avogadro's number which is the number of atoms per mole of an element).
250 (g Sn) / 118.710 (g/mol Sn) = 2.106 mol Sn =
= 2.106 * 6.02*1023 (atoms / mol) = 1.27*1024 atoms of Sn (Tin)
2.95 X 1024 atoms tin (1 mole Sn/6.022 X 1023)(118.7 grams/1 mole Sn)
= 581 grams of tin
=============
How many lithium atoms are in 10.56 g of lithium
1.87810*10^22 Sulfur Atoms.
1.07x10
2.32
#300
The mass of tin is slightly more than the relative atomic mass of tin (118.71). There will be 6.037*10^23 atoms.
The number of atoms is 0,035.10e23.
This mass is 28,8.10e-20 g.
41.7 grams tin (1 mole Sn/118.7 grams)(6.022 X 10^23/1 mole tin )(1 mole tin atoms/6.022 X 10^23) = 0.351 moles of tin atoms in pure tin cup ------------------------------------------------------
The number of atoms of lead is 6,68.10e23.
49.1740 g (6.02 x 1023 atoms) / (91.22 g) = 3.25 x 1023 atoms
149 g of calcium contain 22,39.10e23 atoms.
6,687.1023 chlorine atoms
27,30.10e23 atoms
The number of atoms of lead is 6,68.10e23.
78.96 g of selenium will have 6.023 x 1023 atoms. So, 30.4 g of selenium will have 2.32 x 1023 atoms.
5 g of sulfur contain 0,94.10e23 atoms.