MOLE CONCEPT - Amar Ujala
Transcript of MOLE CONCEPT - Amar Ujala
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MOLE CONCEPT Atomic Mass (परमाणु द्रव्यमान)
Molecular Mass (आणविक द्रव्यमान)
Molar mass (मोलर द्रव्यमान)
Equivalent Weight (तुलयाांकी भार)
Molarity ( मोलरता)
Molality (मोललता )
Normality (नॉममलता)
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EQUIVALENT WEIGHT
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The compound C6H12O4 contains
1. 22 atoms per mole
2. twice the mass percent of H as compared to the mass percent of C
3. six times the mass percent of C as compared to the mass percent of H
4. thrice the mass percent of H as compared to the mass percent of 0
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There are 6.022×1023 entities in 1 mole. So, option A is incorrect.
Atomic mass of Carbon = 12
Atomic mass of Hydrogen = 1
Atomic mass of Oxygen = 16
Molecular mass = (6 × 12) + (12 × 1) + (4 × 16)
= 72 + 12 + 64 = 148
Mass percentage of carbon = 72/148 = 49%
Mass percentage of hydrogen = 12/148 = 8%
Mass percentage of oxygen = 64/148 = 43%
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How many moles are there in 200g of Na?
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Molecular mass of Na=23g/mole
No. of mole=mass / molar mass
In 200g of Na moles is
n=200 gm /23g/mole
=8.69moles of Na.
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How many moles of hydrogen are present in one gm of hydrogen?
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Molar mass of H=1g/mole
No. of moles in 1g of H=1g/ 1 gm / mole
=1 mole
Thus 1 mole of H is present in 1 g of H.
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Convert into mole 12g of O2 gas
20g of water
22g of CO2
2g of helium
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3.65 grams of HCl is dissolved in 16.2 grams of water. The mole
fraction of HCl in the resulting solution is
a) 0.4
b) 0.3
c) 0.2
d) 0.1
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Which one is correct?
a) Molality changes with temperature
b) Molality does not change with temperature
c) Molarity does not change with temperature
d) Normality does not change with temperature
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1. Mixing of table salt in water makes:
(a) Mixture (b) Compound (c) Colloidal (d) Solution
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2.Which of the followings is electrolyte?
(a) glucose (b) NaCI
(c) sugar (d) Ether
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3.For example 10 gm of sodium chloride is added in 90 gm of •
water. This solution is:
(a) 10% (b) 50%
(c) 90% (d) 100%
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4.The number of moles of a solute per liter of a solution
is
(a) Molality (b) Normality
(c) Molarity (d) None
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5.The number of moles of a substance dissolved in
in 1000 cm3
of solution is:
(a) Molality (b) Normality
(c) Molarity (d) None
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