đốt cháy hoàn toàn 2,3g 1 hợp chất bằng khí õi sau phản ứng thu được 2,24 lít CO2 đktc và 2,7 g nước 
a, xđ thành phần định tính các nguyên tố trong hợp chất 
b, tính khối lượng từng nguyên tố trong 2,3g hợp chất trên

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