MyQuestionIcon

4

You visited us 4 times! Enjoying our articles? Unlock Full Access!

Mole Concept and Avogadro's Number

Four grams of...

Question

Four grams of caustic soda contains :

(a) $6.02 \times 10^{23} a t o m s o f i t,$
(b) 4 g atom of sodium,
(c) $6.02 \times 10^{22}$ molecules

(d) 4 moles of NaOH.

Open in App

Solution

Grams into moles:

$4 g N a O H \times \frac{1 m o l N a O H}{39.99 g (m o l a r m a s s) N a O H} = 0.1 m o l N a O H$

Then find the number of molecules using Avogadro's number:

$0.1 m o l N a O H \times \frac{6.02 \times 10^{23} m o l e c u l e s o f N a O H}{1 m o l N a O H}$

$= 6.02 \times 10^{22} m o l e c u l e s N a O H$

(c) $6.02 \times 10^{22} m o l e c u l e s$

Suggest Corrections

thumbs-up

11

Similar questions

6.02 \times 10^{23}

atoms and 1 mole =

6.02 \times 10^{23}

, molecules. How can molecules and atoms be equal?

Q. One gram atom of an element contains

6.02 \times 10^{23}

atoms.
(a) Find the number of oxygen atoms in 4g of

O_{2}

.
(b) Which is heavier, one oxygen atom or 10 hydrogen atoms?

Molar mass of F₂is 38 g. How many atoms are present in 0.147 mole of F₂?

Q. The number of atoms present in 4.25 grams of NH3 is approximately:

Q. The number of atoms present in

4.25 g r a m s

N H_{3}

is approximately

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Mole concept and Avogadro's Number

CHEMISTRY

Watch in App

explore_more_icon

Explore more

Mole Concept and Avogadro's Number

Standard X Chemistry

Join BYJU'S Learning Program

CrossIcon