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Question

Formula unit mass for K2CO3 is


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Solution

Analyze atomic weights of elements in Potassium Carbonate ( K2CO3)

  • The atomic mass of Potassium (K)=39u

So, for two K atoms, atomic mass = 2×39=78u

  • The atomic mass of Carbon (C) =12u

So, for one C atom, atomic mass = 1×12=12u

  • The atomic mass of Oxygen (O)=16u

So, for three O atoms, atomic mass = 3×16=48u

Analyze formula unit mass

Formula unit mass for K2CO3 is:

K2CO3=(2×AtomicmassofK)+(1×AtomicmassofC)+(3×AtomicmassofO)

=78+12+48=138u

Hence, the formula unit mass for K2CO3 is 138u


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