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2Na + 2 H2O -> 2 NaOH + H2
0,23g Na ------ x dm3 H2
2×23g Na ------ 22,4dm3 H2
x=0,112 dm3
a. 0,23g Na ------x g NAOH
46g Na --------80g NAOH
x=0,4g
b. 0,23g Na----x g H2O
46 g Na ---- 36g H2O
x=0,18g