3g of magnesium combine with 2gof oxygen to form magnesium oxide. What is the weight of magnesium oxide that could be formed from 15g of magnesium?

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Solution

$2 M g + O_{2} \to 2 M g O 2 \times 24 32 2 (24 + 16) A s p e r t h e s t o i c h i o m e t r y 2 \times 24 g o f m a g n e s i u m r e a c t s w i t h 32 g o f o x y g e n S o 3 g o f M a g n e s i u m r e a c t s w i t h = \frac{32}{48} \times 3 = 2 g o f o x y g e n . I n t h e g i v e n s o m e t h e r e i s n o l m i t i n g r e a g e n t p r e s e n t . S o b o t h M a g n e s i u m o r o x y g e n c a n d e c i d e t h e p r o d u c t a m o u n t . F r o m t h e a b o v e e q u a t i o n w e c a n s e e t h a t 48 g o f M a g n e s i u m g i v e s 80 g o f M a g n e s i u m o x i d e . 15 g o f m a g n e s i u m g i v e s = \frac{80}{48} \times 15 = 25 g o f m a g n e s i u m o x i d e i s f o r m e d .$

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