標題:
chem~數
發問:
A piece of sodium whium with unknown weight was put into wateer and the weight of hydrorogen gas produced was produced was 0.51g . Find the weght of the piece. (Hint.write the equation first.)
最佳解答:
2Na + 2H2O → 2NaOH + H2 No. of moles of H2 = 0.51/(1x2) = 0.255 mol No. of moles of Na = 0.255 x 2 = 0.51 mol Weight of the piece of Na = 23 x 0.51 = 11.73 g
chem~數
發問:
A piece of sodium whium with unknown weight was put into wateer and the weight of hydrorogen gas produced was produced was 0.51g . Find the weght of the piece. (Hint.write the equation first.)
最佳解答:
2Na + 2H2O → 2NaOH + H2 No. of moles of H2 = 0.51/(1x2) = 0.255 mol No. of moles of Na = 0.255 x 2 = 0.51 mol Weight of the piece of Na = 23 x 0.51 = 11.73 g
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