7. XY₂ bileşiğinin kütlece %20'si X'tir. Eşit Kütledeki X ve Y'den en fazla 30 gram XY elde edilebildiğine göre, tepkime sonun- da hangi elementten kaç gram artar? AJ 6 gram X C) 10 gram Y B) 10 gram X D) 18 gram X E) 18 gram Y
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