Deavionaaaaa

26.11.2021 • 

Mathematics

A 1250 W hair dryer was used for 10 minutes a day for 30 days. A. How much electrical energy was used during this time, in joules? (2 marks)
B. How much electrical energy was used during this time, in kilowatt hours? (2 marks)
C. If the electric company charged 8 cents per kW-h, how much would it cost to use the
hair dryer during this period of time? Express your answer in dollars, to the nearest
penny. (1 marks)

Ответ:

NNopeNNopeNNope

01.11.2021

Mathematics

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We are given with 7.5 moles of oxygen and 7.43 moles of nitrogen.To identify the chemical formula of the compound, we divide each numner by the smaller amount between the two. Hence, oxygen is approx. equal to 1 and nitrogen is equal to 1. Hence teh formula is NO or nitric oxide.

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