URGENT Mole Practice 1. How many moles of HCl are in 7.80 X 10^22 molecules?
___0.13 moles of HCI_

2. How many atoms are in 5.6 moles of Na?
3.2 E 24 atoms of Na

3. A chemical reaction produces 3.81g potassium chloride (KCI). How many formula units of
potassium chloride are there?*Find molar mass of KCI
Answer_3.08 E 22 formula units of KCI

4. Calculate the molar mass of Fe2(SO2)3. Then calculate the mass of iron(III) sulfate of 4.05X1023
formula units.
_269g Fe2(SO4)3_

5. Determine the number of liters in 4.32 grams of water (H2O)
__ 5.37LH2O___

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c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.