Explanation:
The history of contact process was used until a need for concentrated acid arose, particularly for the manufacture of synthetic organic dyes.
0.139 moles of plutonium are present in a sample containing 8.4 x 10²² atoms of Pt.
<h3>How to calculate number of moles?</h3>
The number of moles of a substance can be calculated using the following expression:
no of moles = no of molecules ÷ 6.02 × 10²³
According to this question, 8.4 × 10²² atoms of plutonium are present in the molecule of plutonium.
no of moles = 8.4 × 10²² = 6.02 × 10²³
no of moles = 1.39 × 10-¹
no of moles = 0.139moles
Therefore, 0.139 moles of plutonium are present in a sample containing 8.4 x 10²² atoms of Pt.
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Answer and Explanation:
- Used as a construction frame material and for bending metal works because they are rigid and strong.
- Galvanising or coating the surface would prevent rusting.
N.B.: Mild steel is steel that has low carbon content, also called <em>carbon steel.</em>
I hope this explanation was helpful.
I'm pretty sure it's A because its just sand and everything else is mixed with something Hope that helped Have a good day! :-)