 Chemistry
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 S6. How many atoms are in 6.0 moles of Argon?6.0 mol Ar x (/) = atoms of Ar7. How many moles of Kr are in 112 g of Krypton?112 g Kr x (/) = moles of Kr8. 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 silicon10. 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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1. 25 August, 16:41
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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

6.0 * (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