When 2.50 grams of copper reacts with oxygen?

1 answer:

7 0

Mass oxigen = 2.81 - 2.50 = 0.31 g
Moles O = 0.31 g / 15.9994 g/mol =0.0194

moles Cu = 2.50 g / 63.546 g/mol =0.0393

we divide by the smallest number
0.0194 / 0.0194 = 1 => O
0.0393 / 0.0194 = 2 => Cu
the formula is Cu2O ( Copper (I) oxide )
Ya got this

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A 150.0 mL sample of a 1.50 M solution of CuSO4 is mixed with a 150.0 mL sample of 3.00 M KOH in a coffee cup calorimeter. The t

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"solid potassium iodide decomposes into iodine gas and solid potassium. Write a a balanced chemical equation for this reaction"

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The cost of painting the traffic sign of 7.065 square feet is approximately equal to 25 dollar.

Explanation:

The cost of painting the circular traffic sign is given as 3.50 dollar per square feet. The diameter of the traffic sign is 36 inch, then its radius will be $\frac{36}{2} = 18$ inches.

But as the cost is given in unit of feet, we have to convert the radius from inches to feet.

1 inches = 0.0833 feet

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So, the radius of the traffic sign will be approximately equal to 1.5 feet.

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So, if the cost of painting 1 square feet of traffic sign is 3.50 dollar, then

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