TEST Ch 10 Moles- Part B Math 1. How many moles and grams of gold (MM- 197) are found in 3.01 x 10^22 particles of
gold-
2. How many moles and liters of CO2 (MM-44) gas at STP are in 110 g -
3. What is the percent composition of each element in CaCO3-
Ca-
C-
0
4. What is the empirical formula of a compound that is 27.3% carbon and 72.7% oxygen-
C=
O-
5. Find the molecular formula of a compound with a molecule mass of 330 grams and an
empirical formula of P203-
6. How many grams of aluminum are in 100 g of A1203-
7. What is the density of Co, carbon monoxide gas-

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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.