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Maurinko [17]
3 years ago
7

Can you help me come up with at least three questions about potential and kinetic energy?

Chemistry
1 answer:
Phoenix [80]3 years ago
4 0

Questions:

1) Kinetic energy is the energy an object has due to its ________.

2) Kinetic energy can be calculated from what two measurements?

3) What is the standard unit of measurement for kinetic energy?

4) What would happen to the kinetic energy of an object if you doubled the mass?

--------------------------------------------------------------------------------------------------------------

Answers:

1) Motion

2) Velocity and mass

3) Joule

4) The kinetic energy would double

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First we have to calculate the mass of MnO_2.

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As, (2\times 115)g of MnCO_3 react to give (2\times 87)g of MnO_2

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And as we are given that the yield produced from the first step is, 65 % that means,

60\% \text{ of }0.757xg=\frac{60}{100}\times 0.757x=0.4542xg

The mass of MnO_2 obtained = 0.4542x g

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From the balanced reaction, we conclude that

As, (3\times 87)g of MnO_2 react to give (3\times 55)g of Mn

So, 0.4542xg of MnO_2 react to give \frac{(3\times 55)g}{(3\times 87)g}\times 0.4542x=0.287xg of Mn

And as we are given that the yield produced from the second step is, 80 % that means,

80\% \text{ of }0.287xg=\frac{80}{100}\times 0.287x=0.2296xg

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The given mass of Mn = 8.0 kg = 8000 g     (1 kg = 1000 g)

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x = 34843.20 g = 34.84 kg = 35 kg

Therefore, the mass of MnCO_3 required are, 35 kg

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