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IChO 2012 Washington DC
Answers (2)
>> First : Al in III A >>>> Al = 3+ Second : O must be 2- Third : count and S = 6+
(((((())))))))))))))) ((((((((()))))))))))) The only one answer Coefisient : 1 --> 2 x0.507 ----> 0.507 --> 1.014 gram 1.014 gram must be rounded in 3 SCIENTIFIC NUMBER ---> 1.01 GRAM MUST BE 3 IMPORTANT NUMBER
