Question

there are almost 200 million people alive in Pakistan if you were to distribute 100 rupee to each Pakistani in the form of 5 rupee coin how many mole of coin you must have
?
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Answer 1

total money =200 million×100₹=₹5 ×4×10^9

so 4×10^9 coins we need ..no of moles =4×10^9/6.022×10^23 =6.64×10^-15