Practice Exercise 1Molten gallium reacts with arsenic to form the semiconductor,gallium arsenide, GaAs, used in light–emitting diodes andsolar cells:Ga1l2 + As1s2¡GaAs1s2If 4.00 g of gallium is reacted with 5.50 g of arsenic, how manygrams of the excess reactant are left at the end of the reaction?(a) 1.20 g As (b) 1.50 g As (c) 4.30 g As (d) 8.30 g Ga

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