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How many atoms are in 3. 50 moles of Calcium (Ca)? (1 mole = 6. 02 x 1023 atoms) (SC. 912. P. 8. 9)

A. 4. 0 x 101
B. 1. 40 x 102
C. 6. 02 x 1023
D. 2. 11 x 1024

User Adam Pery
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1 Answer

4 votes

Answer:

D) 2.11 × 10^24

Step-by-step explanation:

Since we know from Avogadro's constant that 1 mole = 6.02 x 10^23 atoms, we can compare it to 3.50 moles. Let's call the unknown number of atoms x:

1 mole = 6.02 x 10^23 atoms

3.50 moles = x

Comparing the left side, how do we get from 1 mole to 3.50 moles? We multiply by 3.50, so do the same to the other side.

6.02 x 10^23 × 3.50 = 2.107 × 10^24, which is approximately 2.11 × 10^24 atoms to 2dp

User Andrew Ryan
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