To cook food, a microwave oven converts electrical energy into ________ energy. A) electromagnetic B) heat C) mechanical D) nucl
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Answer:
129.4g
Explanation:
Reaction equation":
4Al + 3O₂ → 2Al₂O₃
Given mass of oxygen = 115g
Unknown:
mass of aluminum metal that reacted;'
Solution:
We need to convert the given mass of O₂ to mole;
Number of moles =
Molar mass of O₂ = 2(16) = 32g/mol
Number of moles = = 3.6mol
From the balanced reaction equation:
3 moles of O₂ reacted with 4 mole of Al
3.6 moles of O₂ will react with = 4.8mol
Mass of Al = number of moles x molar mass
Mass of Al = 4.8 x 27 = 129.4g