2Ga+6HCl-----> 2GaCl3+3H2
Let x be the number of moles of GaCl3 produced by 5.42*10-5 moles of Ga
2 moles of Ga gives------> 2 moles of GaCl3
5.42*10-5 moles of Ga gives----> x
Cross multiply
2x= 2*5.42*10-5
X= 5.42*10-5 moles of GaCl3
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