Question

Calculate the formula unitmass ofNa2CO3.10H2O.(Atomic mass ofNa=12u,C= 14u,H=1u,O=16u).

Answer 1

Answer:  286 u

Explanation:  

The formula unit mass of Na2CO3.10H2O

                         = (2 x Na)+(1 x C)+(3 x O)+10(1xH+2xO)

                         = (2 x 23)+(1 x 12)+(3 x 16)+10(1x1 + 2x16)

                         = 46 + 12 + 48 + 180

                         = 286 u

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