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…
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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 …
Determine the molecular formula of an oxide of iron in which the mass per cent of iron and oxygen are 69.9 and 30.1 respectively.Given that the molar mass of the oxide is 159.69 g mol-1
Q.8:- Determine the molecular formula of an oxide of iron in which the mass per cent of iron and oxygen are 69.9 and 30.1 respectively.Given that the molar mass of the…
How much copper can be obtained from 100 g of copper sulphate (CuSO4 )?
Q.7:- How much copper can be obtained from 100 g of copper sulphate (CuSO4 )? Answer:- 1 mole of CuSO4 contains 1 mole of copper. Molar mass of CuSO4 = (63.5)…