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PLEASE HELP ME WITH THIS CHEMISTRY QUESTION?? STEP BY STEP!?
For the given elements, calculate the number of atoms in 1.00 gram of that element.
How many atoms of lithium are in 1.00 gram?
How many atoms of cadmium are in 1.00 gram?
How many atoms of carbon are in 1.00 gram?
2 Answers
- 3 years agoFavorite Answer
1. Lithium atoms in 1g of lithium:
Use the formula:
moles = mass / molar mass
moles = 1 / 6.9 (6.9 is the atomic mass of Li)
moles of Lithium in 1g: 0.14 moles (2d.p)
In 1 mole there are 6.02 x 10^23 atoms (Avagadro's constant)
therefore,
in 0.14 moles there are (0.14 x (6.02 x 10^23)) atoms:
= 8.72 x 10^ 22 atoms
Do the same for the other elements.
- hcbiochemLv 73 years ago
The only difference in each calculation with be the molar mass of the element. The rest is unit conversions:
1.00 g Li X (1 mol / 6.941 g Li) X (6.022X10^23 atoms/1 mol) = 8.68X10^22 atoms Li
The first two terms convert the mass into moles. Then Avogadro's number converts moles into a number of atoms.