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KIM [24]
2 years ago
11

How many atoms are in each elemental sample? 7.64 g Bi

Chemistry
1 answer:
Wittaler [7]2 years ago
3 0

<u>Answer:</u>

• 7.64 g Bi = 2.20 x 10²² atoms

• 35.8 g P =  6.95 x 10²³ atoms

<u>Explanation:</u>

First calculate the number of moles in each sample:

no. of moles = mass ÷ molar mass (RMM)

• 7.64 g Bi = 7.64 ÷ 209

                 = 0.03656 mol

• 35.8 g P = 35.8 ÷ 31

                 = 1.155 mol

Then multiply the number of moles by Avogadro's constant (6.02x10²³):

• 0.03656 x 6.02x10²³ = 2.20 x 10²² atoms

• 1.155 x 6.02x10²³ = 6.95 x 10²³ atoms

   

   

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Evaluate the expressions inside the parentheses (PEMDAS)

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In multiplication and division problems, your answer can have no more significant figures than the number with the fewest significant figures.

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Do the addition (PEMDAS).

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