In chemistry we use MOLES rather than dozens. In the cookie example above, \"doz

Question

In chemistry we use MOLES rather than dozens. In the cookie example above, "dozens" can be related to individual number of cookies, OR to mass. Likewise, the mole can be related to the number of individual atoms, OR to the mass of the sample. The periodic table tells you the mass (in grams) of one mole of any element. What is the mass of 1.00 mol of Cu? What is the mass of 0.500 mol of Cu? How many atoms of Cu are there in 0.500 mol Cu? What is the mass of 1.00 mol NaF? How many moles of NaF are there in 100.0g of NaF?

Explanation / Answer

1.

atomic mass of cu is 63.54g/mole

it means 1.00mole of cu is = 63.54 g of cu

2.

1.00mole of cu contains = 63.54 g of cu

0.500mole of cu will contains =(63.54g/1mole)×0.500mole

=31.77g

so 0.500mole of cu will contain 31.77 g of cu.

3.

1. 00mole of cu = 6.022×1023 atoms of cu

0.500mole of cu =(6.022×1023atoms/1.00mole)×0.500moles

=3.011×1023 atoms.

so 0.500ml of cu will contains 3.011×1023 atoms

4.

atomic mass of NaF is 41.988g/mole

means 1.00 mole of NaF is 41.988g

5.

41.988g of NaF = 1.00 moles

100.0g of NaF =(1.00moles/41.988g)×100.0g

=2.38moles

so 100.0 g of NaF will contains 2.38 moles of NaF

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