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monitta
2 years ago
5

What is the number of copper atom in one naira coin which weight is 7.3g a sum of the material is 86%

Chemistry
1 answer:
Step2247 [10]2 years ago
4 0

Answer:

5.9x10²² atoms of Cu are in one naira coin

Explanation:

To solve this question we need to find the mass of Copper. Then, using its molar mass (Cu = 63.546g/mol) we must find the moles of Cu and its atoms using Avogadro's number:

<em>Mass Cu:</em>

7.3g * 86% = 6.278g is the mass of Cu.

<em>Moles Cu:</em>

6.278g * (1mol / 63.546g) = 0.099moles Cu

<em>Atoms Cu:</em>

0.099moles Cu * (6.022x10²³atoms / 1mol) =

<h3>5.9x10²² atoms of Cu are in one naira coin</h3>
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A discus thrower throws a 1.6kg discus at 25m/s what's the kinetic energy?​
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Answer:

<h2>500 J</h2>

Explanation:

The kinetic energy of an object can be found by using the formula

k =  \frac{1}{2} m {v}^{2} \\

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From the question

m = 1.6 kg

v = 25 m/s

We have

k =  \frac{1}{2}  \times 1.6 \times  {25}^{2}  \\  = 0.8 \times 625 \\  = 500

We have the final answer as

<h3>500 J </h3>

Hope this helps you

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3 years ago
How much heat energy is needed to heat 300g of water from 10 degrees Celsius to 50 degrees Celsius
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There is 50.2 kJ heat need to heat 300 gram of water from 10° to 50°C

Explanation:

<u>Step 1: </u>Data given

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initial temperature = 10°C

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Temperature rise = 50 °C - 10 °C = 40 °C

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8 0
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