## What do you mean by significant figures ?

Q.16:- What do you mean by significant figures ?     Answer:- Significant figures are meaningful digits which are known with certainty including the last digit whose value is uncertain. For…

## Match the following prefixes with their multiples

Q.15:- Match the following prefixes with their multiples:      Prefixes                        Multiples (i)  micro            …

## What is the SI unit of mass? How is it defined?

Q.14:- What is the SI unit of mass? How is it defined?     Answer:- The SI unit of mass is kilogram (kg). The kg is defined as the mass of…

## Pressure is determined as force per unit area of the surface. The SI unit of pressure, pascal is as shown below : 1Pa = 1N m-2 If mass of air at sea level is 1034 g cm-2,calculate the pressure in pascal.

Q.13:- Pressure is determined as force per unit area of the surface. The SI unit of pressure, pascal is as shown below : 1Pa = 1N m-2 If mass of air…

## If the density of methanol is 0.793 kg L-1 , what is its volume needed for making 2.5 L of its 0.25 M solution?

Q.12:- If the density of methanol is 0.793 kg L-1 , what is its volume needed for making 2.5 L of its 0.25 M solution? Answer:- Molar mass of methanol…

## What is the concentration of sugar (C12H22O11) in mol L-1 if its 20 g are dissolved in enough water to make a final volume up to 2L?

Q.11:- What is the concentration of sugar (C12H22O11) in mol L-1  if its 20 g are dissolved in enough water to make a final volume up to 2L?     Answer:-…

## In three moles of ethane (C2H6), calculate the following : (i) Number of moles of carbon atoms. (ii) Number of moles of hydrogen atoms. (iii) Number of molecules of ethane.

Q.10:- In three moles of ethane (C2H6), calculate the following : (i) Number of moles of carbon atoms. (ii) Number of moles of hydrogen atoms. (iii) Number of molecules of ethane….

## Calculate the atomic mass (average) of chlorine using the following data

Q.9:- Calculate the atomic mass (average) of chlorine using the following data :                   % Natural Abundance            …