Question

if the atomic mass of oxygen were taken as 100,then molar mass of water would be?

Answer 1

Explanation:

Molar mass of a molecule or compound is defined as the sum of atomic mass of all the atoms present in the given formula.

For example, molar mass of $H_{2}O$ = atomic mass of hydrogen + atomic mass of oxygen

                   = $2 \times (1.00) g/mol + 16 g/mol$

                   = 18 g/mol

Now, when the atomic mass of oxygen is 100 g/mol then molar mass of water will be as follows.

        Molar mass of $H_{2}O$ = atomic mass of hydrogen + atomic mass of oxygen

                   = $2 \times (1.00) g/mol + 100 g/mol$

                   = 102 g/mol

Thus, we can conclude that if the atomic mass of oxygen were taken as 100,then molar mass of water would be 102 g/mol.

Answer 2

"Molar mass" of a molecule or compound is defined as the sum of "atomic mass" of all the atoms present in the given formula.

For example,

$Molar\quad mass\quad of\quad H_{ 2 }O=Atomic\quad mass\quad of\quad hydrogen\quad +\quad Atomic\quad mass\quad of\quad oxygen$

$=\quad 2\quad \times \quad (1.00)\frac { g }{ mol } \quad +\quad 16\frac { g }{ mol }$

$Molar\quad mass\quad of\quad H_{ 2 }O\quad =\quad 18\quad \frac { g }{ mol }$

When the atomic mass of oxygen is 100 g/mol then "molar mass of water" will be as follows.

$Molar\quad mass\quad of\quad H_{ 2 }O=Atomic\quad mass\quad of\quad hydrogen\quad +\quad Atomic\quad mass\quad of\quad oxygen$

$=\quad 2\quad \times \quad (1.00)\frac { g }{ mol } \quad +\quad 100\frac { g }{ mol }$

$Molar\quad mass\quad of\quad H_{ 2 }O\quad =\quad 102\quad \frac { g }{ mol }$