Tutor profile: Audrey C.
A store sells widgets for 6.50$ and dolls for 2.00$ each. Total revenue for the day was 836.50$ and their inventory was depleted by 209 items. How many widgets did they sell?
6.5x + 2y = 836.5 x+y=209, 2x + 2y = 418 4.5x= 418.5 x = 93 widgets x = widgets, y = dolls
Balance the reaction and solve the question: P4(s) + F2(g) --> PF3(g) How many grams of F2 are needed to produce 120g of PF3 if the reaction has a 78.1% yield?
1) Balance the reaction: P4 + 6 F2 --> 4 PF3 2) yield adjustment 78.1% = 120g/x *100 --> x = 153.649g PF3 3) stoichiometric dimensional analysis--> 153.65g PF3 * 1mol PF3/88g PF3* 6mol F2/4PF3 * 38g F2/1mol F2 = 99.5g F2
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