Which has maximum molecules ? a. 7g nitrogen b. 2g hydrogen c. 16gNO2 d. 16 g oxygen
Answers
2gm Hydrogen = 2 moles
16gm nitrous = 8/23 moles
16gm oxygen = 1 mole
since no of molecules directly proportional to the moles
=> 2gm of Hydrogen will have more molecules.
Answer:
2gm of Hydrogen has maximum number of molecules.
Explanation:
(a)7gm Nitrogen molecule (N2)
weight= 7gm, atomic weight= 28
No of moles of present in 7gm Nitrogen =
weight/ molecular weight
= 7/28
=0.25 moles
No of molecules present in 1 mole of Nitrogen=6.022×10²³
No of atoms present in 0.25 moles of Nitrogen molecule
= 0.25×6.022×10²³
= 1.50×10²³ molecules
(b) 2gm Hydrogen molecule (H2)
weight=2, molecular weight = 2
No of moles of Hydrogen= 2/2
=1 mole
No of molecules present in 1 mole of Hydrogen molecule
= 6.022×10²³ molecules
(c) 16gm of NO2
weight=16,
molecular weight = 14+2×16=14+32=46
No of moles of NO2
= weight/molecular weight
=16/46
=0.35 moles
No of molecules present in 1 mole of NO2= 6.022×10²³
No of molecules present in 0.35gm of NO2 =0.35×6.022×10²³
= 2.11×10²³ molecules
(d) 16gm of Oxygen molecule (O2)
weight=16, atomic weight = 32
No of moles of Oxygen= 16/32
=0.5 moles
No of molecules present in 1 mole of Oxygen molecule=6.022×10²³
No of molecules present in 0.5 mole of Oxygen molecule
=0.5×6.022×10²³
=3.011×10²³ molecules
Conclusion:
2 gm of Hydrogen molecule contains maximum number of molecules (6.022×10²³).