Question

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1) find the molarity of a 100 ml solution containing 60 gms of glucose ???


=> Class 9 ( ATOMS AND MOLECULES )


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@ Prabhudutt....

Answer 1

☆☆AS-SALAMU-ALYKUM☆☆

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MOLARITY = NUMBER OF MOLES OF SOLUTE ÷ VOLUME OF SOLUTION

MOLES OF SOLUTE THAT IS GLUCOSE ARE = MASS÷ MOLAR MASS

MOLAR MASS OF GLUCOSE IS = C6H12O6=12×6 + 1×12 + 16 ×6 = 180g/mol

MOLES OF GLUCOSE = 60÷ 180= 1÷3= 0.333mol

VOLUME OF SOLUTION =100ml

1ml =1÷1000l

100ml=1÷1000 × 100

100ml= 0.1 lit

VOLUME OF SOLUTION =0.1 LITRE

NOW

MOLARITY = 0.333÷0.1

MOLARITY =3.33 M

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Answer 2

Moles of glucose : 0.33 mol

volume of solution : 100ml

volume of solution ( in litres) : 0.1 L

Molarity : 0.33 / 0.1 = 3.3 M