1. Consider the following data:
Element Atomic Weight
A26.05
B12.01
A and B combine to form a new substance: X. If four moles of B atoms combine with one mole of A atoms to give one mole of X molecules, then the weight of one mole of X molecules is
(a) 47.5 g
(b) 74.09 g
(c) 83.09 g
(d) 154.0 g
(e) 166.09 g
2. Write chemical formulae i) hydrogen peroxide, ii) hydrogen bromide, iii) boron trichloride, iv) carbon tetrachloride, v) nitrogen trichloride and vi) oxygen dibromide.
Chem question(Urgent) Thanks
2007-01-21 6:01 am
回答 (2)
2007-01-21 7:21 am
✔ 最佳答案
1. (b) because 4moles of B atoms + 1 mole of A atoms formula of X is AB4
one mole of X is 26.05+4*12.01=74.09g
2. i) H2O2
II) HBr
iii) BCl3
iv) CCl4 (it can call as tetrachloromethane)
v) NCl3
vi) Br2O
參考: memory
2007-01-21 7:12 am
1)b
molar mass of X: 26.05+12.01*4=74.09 g mol-1
2)
i)H2O2
ii)HBr
iii)BCl4
iv)CCl4
v)NCl4
vi)Br2O
molar mass of X: 26.05+12.01*4=74.09 g mol-1
2)
i)H2O2
ii)HBr
iii)BCl4
iv)CCl4
v)NCl4
vi)Br2O
收錄日期: 2021-04-13 14:50:29
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