Answer
Verified
395.7k+ views
Hint: Add atomic masses of hydrogen and oxygen. But the atomic mass of hydrogen is to be multiplied with 2.
Complete step by step answer:
Molar mass of a substance is that mass of the substance which contains one mole of substance. In simple terms, it is the weight of one mole of substance. To calculate the molar mass, the atomic mass of each substance is multiplied with the subscript of that element in the chemical formula. Then the masses of all the elements are added.
\[{{\rm{H}}_2}{\rm{O}}\] represents water. One molecule of water contains one oxygen atom and two hydrogen atoms. One mole of water contains one mole of oxygen atoms and two moles of hydrogen atoms.
The molar mass is also called the molecular weight. It is the sum of atomic weights of all the atoms present in the molecule of the compound.
The atomic weights of oxygen and hydrogen are 16 u and 1 u respectively.
Calculate the molar mass of water
2(1)+16=18 u.
Thus, the molar mass of water is 18 u.
Here, ‘u’ is a unified mass unit also represented as’amu’ (the atomic mass unit).
Instead of u, another unit can be used is g/mol.
The atomic weights of oxygen and hydrogen are 16 g/mol and 1 g/mol respectively.
Calculate the molar mass of water
2(1)+16=18 g/mol.
In more accurate measurement, the atomic mass of hydrogen is taken as 1.01 g/mol. Then, the molar mass of water is 2(1.01)+16=18.02 g/mol.
Thus, one mole of water weighs 18.02 g.
Note:
Do not forget to multiply the atomic mass of hydrogen with subscript 2 as there are two hydrogen atoms in the chemical formula of water.
Complete step by step answer:
Molar mass of a substance is that mass of the substance which contains one mole of substance. In simple terms, it is the weight of one mole of substance. To calculate the molar mass, the atomic mass of each substance is multiplied with the subscript of that element in the chemical formula. Then the masses of all the elements are added.
\[{{\rm{H}}_2}{\rm{O}}\] represents water. One molecule of water contains one oxygen atom and two hydrogen atoms. One mole of water contains one mole of oxygen atoms and two moles of hydrogen atoms.
The molar mass is also called the molecular weight. It is the sum of atomic weights of all the atoms present in the molecule of the compound.
The atomic weights of oxygen and hydrogen are 16 u and 1 u respectively.
Calculate the molar mass of water
2(1)+16=18 u.
Thus, the molar mass of water is 18 u.
Here, ‘u’ is a unified mass unit also represented as’amu’ (the atomic mass unit).
Instead of u, another unit can be used is g/mol.
The atomic weights of oxygen and hydrogen are 16 g/mol and 1 g/mol respectively.
Calculate the molar mass of water
2(1)+16=18 g/mol.
In more accurate measurement, the atomic mass of hydrogen is taken as 1.01 g/mol. Then, the molar mass of water is 2(1.01)+16=18.02 g/mol.
Thus, one mole of water weighs 18.02 g.
Note:
Do not forget to multiply the atomic mass of hydrogen with subscript 2 as there are two hydrogen atoms in the chemical formula of water.
Recently Updated Pages
Basicity of sulphurous acid and sulphuric acid are
Three beakers labelled as A B and C each containing 25 mL of water were taken A small amount of NaOH anhydrous CuSO4 and NaCl were added to the beakers A B and C respectively It was observed that there was an increase in the temperature of the solutions contained in beakers A and B whereas in case of beaker C the temperature of the solution falls Which one of the following statements isarecorrect i In beakers A and B exothermic process has occurred ii In beakers A and B endothermic process has occurred iii In beaker C exothermic process has occurred iv In beaker C endothermic process has occurred
The branch of science which deals with nature and natural class 10 physics CBSE
The Equation xxx + 2 is Satisfied when x is Equal to Class 10 Maths
How do you arrange NH4 + BF3 H2O C2H2 in increasing class 11 chemistry CBSE
Is H mCT and q mCT the same thing If so which is more class 11 chemistry CBSE
Trending doubts
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
Two charges are placed at a certain distance apart class 12 physics CBSE
Difference Between Plant Cell and Animal Cell
What organs are located on the left side of your body class 11 biology CBSE
Change the following sentences into negative and interrogative class 10 english CBSE
The planet nearest to earth is A Mercury B Venus C class 6 social science CBSE
The Equation xxx + 2 is Satisfied when x is Equal to Class 10 Maths
What is BLO What is the full form of BLO class 8 social science CBSE