An advice is given by the government of India to all the pharmaceutical companies for the manufacture of a medicine having a concentration of 2700 ppb used for treating Covid-19 patients. The concentration of medicine in %(w/w) is:
A
2.7×10−4
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B
6.5×10−4
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C
3.2×10−3
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D
6.5×10−3
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Solution
The correct option is A2.7×10−4 partperbillion=massofsolutemassofsolution×109 massofsolutemassofsolution=partsperbillion109 masspercentage=massofsolutemassofsolution×100 masspercentage=givenvalueinppb109×100 =2700109×100=2.7×10−4%(w/w)