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ICSE Class 9 Answered

A density bottle weighs 30 g when empty and 54 kg when filled with kerosene. Find density of kerosene in C.G.S. Units and its R.D(volume of bottle is 30 ml)
Asked by bosesunayna.123 | 27 Jul, 2020, 03:09: PM
Expert Answer
The correct question must be as follows. The question stated above has 54 kg which is to be replaced by 54 g 
So the correct question is : - 
A density bottle weighs 30 g when empty and 54 g when filled with kerosene. Find density of kerosene in C.G.S. Units and its R.D(volume of bottle is 30 ml)
Solution:- 
Mass of bottle when empty is 30 g 
Mass of bottle when filled with kerosene is 54 g 
Thus of mass of liquid is =  54 g - 30 g = 24 g
Volume of bottle = 30 ml = 30 cm3 
density =  mass/ volume 
Thus, 
Density of kerosene  = 24/30 = 0.8 g/cm3   
Thus, density of kerosene in CGS unit is 0.8 g/cm3 
R e l a t i v e space d e n s i t y space equals space fraction numerator d e n s i t y space o f space s u b s tan c e over denominator d e n s i t y space o f space w a t e r space end fraction
T h u s comma space
R. D. space equals space fraction numerator 0.8 space g divided by c m cubed over denominator 1 space g divided by c m cubed end fraction space equals space 0.8 space 
Thus, R.D. of kerosene is 0.8  
Answered by Shiwani Sawant | 27 Jul, 2020, 06:02: PM

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