C= 51.89% H= 9.82% Br=38.29% Can someone please help me come up with a molecular formula if the weight of the molecule is 94. Please show work!

Tin has ten stable isotopes. the heaviest, 124sn, makes up 5.80% of naturally occuring tin atoms. how many atoms of 124sn are present in 82.0 g of naturally occurring tin? what is the total mass of the 124sn atoms in this sample?

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If you burn 46.6 g of hydrogen and produce 416 g of water, how much oxygen reacted