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Q.

Determine the number of moles of 256 g of Oxygen (O2) gas.

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a

3

b

8

c

5

d

4

answer is B.

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Detailed Solution

Given:  Mass of the given substance (m)= 256 g 
              Molar mass of Oxygen (O2)(M)= 32g
Solution:
Number of moles of oxygen gas = Mass of oxygen (m)Molar mass of oxygen (M)  
                                                                   
                                                                    = 256g32g

                                                                  = 8 moles
The number of moles of oxygen gas in 256g of sample is 8.
 

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Determine the number of moles of 256 g of Oxygen (O2) gas.