Byju's Answer

Standard VIII

Chemistry

Introduction to Water

The molecular...

Question

The molecular mass of water is ___.

9 u

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10 u

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18 u

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33 u

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Solution

The correct option is C
18 u

One molecule of water is composed of 2 hydrogen atoms and 1 oxygen atom.
Hence its molecular mass = 2 (atomic mass of hydrogen) + Atomic mass of oxygen = 2(1)+16 = 18 u

Suggest Corrections

Similar questions

(a) Calculate the relative molecular mass of water (H2O).

(b) Calculate the molecular mass of HNO3.

Q. An electron (mass

= 9 \times 10^{- 31} k g

. Charge

= 1.6 \times 10^{- 19} C

) whose kinetic energy is

7.2 \times 10^{- 18}

joule is moving in a circular orbit in a magnetic field of

9 \times 10^{- 5}

weber

/ m

. The radius of the orbit is

Match the following:

$\begin{matrix} 1 & M o l e c u l a r f o r m u l a o f w a t e r & A & 18 a m u 2 & C h e m i c a l n a m e o f w a t e r & B & O c e a n s 3 & M o l e c u l a r m a s s o f w a t e r & C & H_{2} O 4 & L a r g e w a t e r b o d i e s & D & D i h y d r o g e n m o n o x i d e \end{matrix}$

a

and

b

are in ............ proportion

$a$	$3$	$7$	$10$	$11$
$b$	$9$	$21$	$30$	$33$

Correct the following statements:

(a) A molecular formula represents an element.

(b) Molecular formula of water ( $H_{2} O$ ) represents 9 parts by mass of water.

(d) A molecule of an element is always monoatomic.

(e) CO and Co both represent cobalt.

The molecular mass of water is ___.

The correct option is C 18 u One molecule of water is composed of 2 hydrogen atoms and 1 oxygen atom. Hence its molecular mass = 2 (atomic mass of hydrogen) + Atomic mass of oxygen = 2(1)+16 = 18 u

The correct option is C
18 u

One molecule of water is composed of 2 hydrogen atoms and 1 oxygen atom.
Hence its molecular mass = 2 (atomic mass of hydrogen) + Atomic mass of oxygen = 2(1)+16 = 18 u