Question

calculate the formula unit masses of zno,na2oand K2co3 atomic mass of zn=65 u,na=23u,k=39,c=12u,o=16u

Answer 1

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here is your answer...

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Calculating the formula unit mass of the following elements :

(1) ZnO
Solve =>
Formula unit mass of ZnO (zinc oxide)
= (1 × atomic mass of Zu) + (1 × atomic mass of O)
= (1 × 65 u) + (1 × 16 u)
= (65 + 16)u
= 62 u

(2) Na2O
Solve =>
Formula unit mass of Na2O (sodium oxide)
= (2 × atomic mass of Na) + (1 × atomic mass of O)
= (2 × 23 u) + (1 × 16 u)
= (46 + 16)u
= 62 u

(3) K2CO3
Solve =>
Formula unit of K2CO3
= (2 × atomic mass of K) + ( 1 × atomic mass of C) + ( 3 atomic mass of O)
= (2 × 39 u) + (1 × 12 u) + (3 × 16 u)
= (78 + 12 + 48)u
= 138 u

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Answer 2

The formula unit mass of

(i) ZnO = 65 u + 16 u = 81 u

(ii) Na2O = (23 u x 2) + 16 u = 46 u + 16 u = 62 u

(iii) K2C03 = (39 u x 2) + 12 u + 16 u x 3

= 78 u + 12 u + 48 u = 138 u