Please work out the formula of the white solid?
更新1:
But the formula of sodium sulphide should be Na2S, right?
Chemistry Mole Concept
2008-11-14 8:14 am
A student heated 4 g sodium metal with excess sulphur until no further reaction occurred. The mass of the sodium increased to 9.56 g, and the appearance changed from a shiny silver to a dull white.
Please work out the formula of the white solid?
Please work out the formula of the white solid?
回答 (1)
2008-11-14 10:08 am
✔ 最佳答案
Molar mass of Na = 23 g mol-1
Molar mass of S = 32 g mol-1
In the dull white solid formed:
Mass of Na = 4 g
Mass of S = (9.56 - 4) = 5.56 g
Mole ratio Na : S
= 4/23 : 5.56/32
= 0.174 : 0.174
= 1 : 1
The formula of the white ash = NaS
=
2008-11-16 19:15:08 補充：
The formula of sodium sulphide is Na2S.
According to the data given in the question, the calculated formula is NaS.
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