Question

calculate the no. of molecules in the following compound. (a) 52gm of oxygen (b) 90gms of water (c) 66gms of CO2​

Answer 1

Answer:

a answer is there molecules

Answer 2

Answer:

a) we know that  

  Number of moles = given mass / molar mass

                                =52/32

                                = 1.625 moles

no. of molecules = 1.625 X 6.022 X10^23

                 = 9.7857 X 10^23 molecules

b. 90g of water

Number of moles in water =  

Molecular mass of water /Mass of water in grams

=  90/18

​=5 moles

5 moles of H2 O contains ...... 5×6.022×10 ^23

 molecules =30.11×10^23 molecules

c) The answer would be 1.5 moles.

You would use the equation n=m/Mr. Then you would calculate the Mr of carbon dioxide (CO2) which is 12+(16*2)= 44. Finally you would substitute your numbers:

n= 66/44

n= 1.5 moles

now number of molecules = 1.5 X 6.022 X10 ^23

                                            = 9.033 X 10^23 molecules

Explanation:

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