Percentage by mass and Percentage by volume

Proof is defined as ….. the percentage by volume of alcohol in ethanol-water mixture.

PCV / haematocrit value is total percentage of volume occupied by

What is the maximum percentage error in density of body if percentage error in measurement of mass is 4% , and percentage error in measurement of side 1% ?

In what ratio should a 15% solution of acetic acid be mixed with a 3% solution of the acid to prepare a 10% solution (all percentage are mass/mass percentage) :

In fission,the percentage of mass converted into energy is about

How much percentage of air by mass is present in troposphere?

If the temperature of an ideal gas is increased by 25% then by what percentage would its volume increase?

In an organic compound of molar mass greater than 100 containing only C , H and N , the percentage of C is 6 times the percentage of H while the sum of the percentage of C and H is 1.5 times the percentage of N . What is the least molar mass :

By what percentage should the pressure of a given mass of a gas be increased so as to decrease its volume by 10% at a constant temperature?

The relation between pressure P and volume V is givne by PV^(-(1)/(4)) = constant. If the percentage decrease in volume is (1)/(4) , then the approximate percentage increase in pressure is