An element X reacts with O2 to form a compound X2O5. If 0.35g of the element forms 0.55g of the compound, what is the approximate atomic mass of the element?

Md Ariful Islam

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Let x be atomic mass of the element X (in grams per mole). Atomic mass of O is known, it is 16. Then molar mass of the compound must be nearly 2x+5×16=2x+80. The reaction is 2X+2.5O_2→X_2 O_5, so 2 moles of X produces 1 mole of the compound, therefore x can be found from the following proportion: 2x -0.35g 2x+80 -0.55g 2x/0.35=(2x+80)/0.55→0.55(2x)=0.35(2x+80)→1.1x=0.7x+28→0.4x=28→ →x=28/0.4=70 Answer: Approximate atomic mass of X is 70.
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