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25 August, 15:51

4. How many moles are in 54.0 grams of Silver?

54.0 g Ag x (108mol ag / 1 g ag) = 5,832 ag moles Ag

(Use the gray boxes to insert the values for the conversion factors.)

5. What is the mass of 6.3 moles of Sulfur?

6.3 mol S x (/) = g S

6. How many atoms are in 6.0 moles of Argon?

6.0 mol Ar x (/) = atoms of Ar

7. How many moles of Kr are in 112 g of Krypton?

112 g Kr x (/) = moles of Kr

8. How many moles are in 1.93 x1024 formula units of KF, potassium fluoride?

1.93 x1024 formula units x (/) = mol KF

(The next two problems need 2 step conversions - so there are two conversion factors (fractions) for the problem - remember the mole map - covert to moles first, then to the desired unit.)

9. How many atoms are in 86.2 g of Si (silicon) ?

86.2 g Si x (/) x (/) = atoms of silicon

10. What is the mass in grams of 4.8 x 1024 atoms of Magnesium?

4.8 x 1024 atoms of Mg x (/) x (/) = g Mg

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Answers (1)
  1. 25 August, 16:41
    0
    4. Molar mass of silver m Ms~=108 g/mol

    Hence there are n=54 * (1/108) = 0.5 mols of Silver in 54 grams of Silver.

    5. 6.3 * (108/1) = 680.4g

    6. Avogadro's number : Na~=6.022*10^23.

    6.0 * (6.022*10^23/1) = 36.132*10^23 atoms

    7. Molar mass of Krypton : Mk=84 g/mol

    112/84=1.33 moles of Kr

    8. 1.93*10^24 * (1 / (6.022*10^23)) = 3.2 moles KF

    9. Molar mass of Silicon : Ms=28 g/mol

    86.2 * (1/28) * (6.022*10^23/1) = 18.5*10^23 atoms of silicon

    10. Molar mass of Magnesium : M1=24 g/mol

    4.8*10^24 * (1 / (6.022*10^23)) * (24/1) = 191 g Mg
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