306771
A 5 L vessel contains 2.8 g of \({{\rm{N}}_{\rm{2}}}\). When heated to 1800 K, 30% molecules are dissociated into atoms. Identify the correct statement.
1 Total number of moles in the container will be 0.13.
2 Total number of molecules in the container will be \({\rm{0}}{\rm{.78 \times 1}}{{\rm{0}}^{{\rm{23}}}}\).
3 Total number of atoms in the container will be 0.06.
4 All of the above.
Explanation:
30% molecules are dissociated as \({{\rm{N}}_{\rm{2}}} \to {\rm{2N}}\) Amount of \({{\rm{N}}_{\rm{2}}}\) left (in moles) \({\rm{ = }}\frac{{{\rm{2}}{\rm{.8}}}}{{{\rm{28}}}}{\rm{ \times }}\frac{{{\rm{70}}}}{{{\rm{100}}}}\) \({\rm{ = 0}}{\rm{.1 \times 0}}{\rm{.7 = 0}}{\rm{.07}}\) No. of moles of N atoms formed \({\rm{ = 2 \times }}\frac{{{\rm{30}}}}{{{\rm{100}}}}{\rm{ \times }}\frac{{{\rm{2}}{\rm{.8}}}}{{{\rm{28}}}}\) \({\rm{ = 0}}{\rm{.06}}\) moles. No. of atoms in container \({\rm{ = 0}}{\rm{.06 \times 6}}{\rm{.023 \times 1}}{{\rm{0}}^{{\rm{23}}}}\) \({\rm{ = 0}}{\rm{.36 \times 1}}{{\rm{0}}^{{\rm{23}}}}{\mkern 1mu} {\mkern 1mu} {\rm{moles}}\) Total no. of moles \({\rm{ = 0}}{\rm{.07 + 0}}{\rm{.06 = 0}}{\rm{.13}}{\mkern 1mu} {\mkern 1mu} {\rm{moles}}\) Total number of molecules \({\rm{ = 0}}{\rm{.07 \times 06}}{\rm{.023 \times 1}}{{\rm{0}}^{{\rm{23}}}}\) \({\rm{ = 0}}{\rm{.421 \times 1}}{{\rm{0}}^{{\rm{23}}}}\) molescules [\(\because \) Product contains atoms of nitrogen and not molecules].
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY
306772
The number of molecules and moles in 2.8375 litres of \({\mathrm{\mathrm{\mathrm{O}_{2}}}}\) at STP are respectively
1 \({\mathrm{\mathrm{7.527 \times 10^{23}}}}\) and 0.125 mol
2 \({\mathrm{\mathrm{7.527 \times 10^{22}}}}\) and 0.125 mol
3 \({\mathrm{\mathrm{1.505 \times 10^{23}}}}\) and 0.250 mol
4 \({\mathrm{\mathrm{7.527 \times 10^{22}}}}\) and 0.250 mol
Explanation:
Number of moles of \({\mathrm{\mathrm{O}_{2}}}\) at \({\mathrm{\mathrm{STP}=\dfrac{2.8375 \mathrm{~L}}{22.4 \mathrm{~L}}}}\) \({\mathrm{=0.126 \mathrm{~mol} \simeq 0.125 \mathrm{~mol}}}\) Number of molecules of \({\mathrm{\mathrm{O}_{2}}}\) at STP \({\mathrm{=0.125 \times 6.022 \times 10^{23}=0.7527 \times 10^{23}}}\) (or) \({\mathrm{7.527 \times 10^{22}}}\)
JEE - 2023
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY
306773
Which of the following element can exist as atomicity 8?
1 H
2 O
3 S
4 N
Explanation:
Sulphur exists in octa atomic molecule i.e., \({{\rm{S}}_{\rm{8}}}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY
306774
A compound has \(\mathrm{20 \%}\) of nitrogen by weight. If one molecule of the compound contains two nitrogen atoms, the molecular weight of the compound is
1 35
2 70
3 140
4 280
Explanation:
Mass of two nitrogen atoms \(\mathrm{=28 \mathrm{~g}}\) Compound has \(\mathrm{20 \%}\) nitrogen, means \(\mathrm{20 \mathrm{~g}}\) nitrogen is present in \(\mathrm{100 \mathrm{~g}}\) compound \(\mathrm{28 \mathrm{~g}}\) nitrogen is present in ? g compound ? \(\mathrm{=\dfrac{28 \times 100}{20}=140 \mathrm{~g}}\) compound
306771
A 5 L vessel contains 2.8 g of \({{\rm{N}}_{\rm{2}}}\). When heated to 1800 K, 30% molecules are dissociated into atoms. Identify the correct statement.
1 Total number of moles in the container will be 0.13.
2 Total number of molecules in the container will be \({\rm{0}}{\rm{.78 \times 1}}{{\rm{0}}^{{\rm{23}}}}\).
3 Total number of atoms in the container will be 0.06.
4 All of the above.
Explanation:
30% molecules are dissociated as \({{\rm{N}}_{\rm{2}}} \to {\rm{2N}}\) Amount of \({{\rm{N}}_{\rm{2}}}\) left (in moles) \({\rm{ = }}\frac{{{\rm{2}}{\rm{.8}}}}{{{\rm{28}}}}{\rm{ \times }}\frac{{{\rm{70}}}}{{{\rm{100}}}}\) \({\rm{ = 0}}{\rm{.1 \times 0}}{\rm{.7 = 0}}{\rm{.07}}\) No. of moles of N atoms formed \({\rm{ = 2 \times }}\frac{{{\rm{30}}}}{{{\rm{100}}}}{\rm{ \times }}\frac{{{\rm{2}}{\rm{.8}}}}{{{\rm{28}}}}\) \({\rm{ = 0}}{\rm{.06}}\) moles. No. of atoms in container \({\rm{ = 0}}{\rm{.06 \times 6}}{\rm{.023 \times 1}}{{\rm{0}}^{{\rm{23}}}}\) \({\rm{ = 0}}{\rm{.36 \times 1}}{{\rm{0}}^{{\rm{23}}}}{\mkern 1mu} {\mkern 1mu} {\rm{moles}}\) Total no. of moles \({\rm{ = 0}}{\rm{.07 + 0}}{\rm{.06 = 0}}{\rm{.13}}{\mkern 1mu} {\mkern 1mu} {\rm{moles}}\) Total number of molecules \({\rm{ = 0}}{\rm{.07 \times 06}}{\rm{.023 \times 1}}{{\rm{0}}^{{\rm{23}}}}\) \({\rm{ = 0}}{\rm{.421 \times 1}}{{\rm{0}}^{{\rm{23}}}}\) molescules [\(\because \) Product contains atoms of nitrogen and not molecules].
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY
306772
The number of molecules and moles in 2.8375 litres of \({\mathrm{\mathrm{\mathrm{O}_{2}}}}\) at STP are respectively
1 \({\mathrm{\mathrm{7.527 \times 10^{23}}}}\) and 0.125 mol
2 \({\mathrm{\mathrm{7.527 \times 10^{22}}}}\) and 0.125 mol
3 \({\mathrm{\mathrm{1.505 \times 10^{23}}}}\) and 0.250 mol
4 \({\mathrm{\mathrm{7.527 \times 10^{22}}}}\) and 0.250 mol
Explanation:
Number of moles of \({\mathrm{\mathrm{O}_{2}}}\) at \({\mathrm{\mathrm{STP}=\dfrac{2.8375 \mathrm{~L}}{22.4 \mathrm{~L}}}}\) \({\mathrm{=0.126 \mathrm{~mol} \simeq 0.125 \mathrm{~mol}}}\) Number of molecules of \({\mathrm{\mathrm{O}_{2}}}\) at STP \({\mathrm{=0.125 \times 6.022 \times 10^{23}=0.7527 \times 10^{23}}}\) (or) \({\mathrm{7.527 \times 10^{22}}}\)
JEE - 2023
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY
306773
Which of the following element can exist as atomicity 8?
1 H
2 O
3 S
4 N
Explanation:
Sulphur exists in octa atomic molecule i.e., \({{\rm{S}}_{\rm{8}}}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY
306774
A compound has \(\mathrm{20 \%}\) of nitrogen by weight. If one molecule of the compound contains two nitrogen atoms, the molecular weight of the compound is
1 35
2 70
3 140
4 280
Explanation:
Mass of two nitrogen atoms \(\mathrm{=28 \mathrm{~g}}\) Compound has \(\mathrm{20 \%}\) nitrogen, means \(\mathrm{20 \mathrm{~g}}\) nitrogen is present in \(\mathrm{100 \mathrm{~g}}\) compound \(\mathrm{28 \mathrm{~g}}\) nitrogen is present in ? g compound ? \(\mathrm{=\dfrac{28 \times 100}{20}=140 \mathrm{~g}}\) compound
306771
A 5 L vessel contains 2.8 g of \({{\rm{N}}_{\rm{2}}}\). When heated to 1800 K, 30% molecules are dissociated into atoms. Identify the correct statement.
1 Total number of moles in the container will be 0.13.
2 Total number of molecules in the container will be \({\rm{0}}{\rm{.78 \times 1}}{{\rm{0}}^{{\rm{23}}}}\).
3 Total number of atoms in the container will be 0.06.
4 All of the above.
Explanation:
30% molecules are dissociated as \({{\rm{N}}_{\rm{2}}} \to {\rm{2N}}\) Amount of \({{\rm{N}}_{\rm{2}}}\) left (in moles) \({\rm{ = }}\frac{{{\rm{2}}{\rm{.8}}}}{{{\rm{28}}}}{\rm{ \times }}\frac{{{\rm{70}}}}{{{\rm{100}}}}\) \({\rm{ = 0}}{\rm{.1 \times 0}}{\rm{.7 = 0}}{\rm{.07}}\) No. of moles of N atoms formed \({\rm{ = 2 \times }}\frac{{{\rm{30}}}}{{{\rm{100}}}}{\rm{ \times }}\frac{{{\rm{2}}{\rm{.8}}}}{{{\rm{28}}}}\) \({\rm{ = 0}}{\rm{.06}}\) moles. No. of atoms in container \({\rm{ = 0}}{\rm{.06 \times 6}}{\rm{.023 \times 1}}{{\rm{0}}^{{\rm{23}}}}\) \({\rm{ = 0}}{\rm{.36 \times 1}}{{\rm{0}}^{{\rm{23}}}}{\mkern 1mu} {\mkern 1mu} {\rm{moles}}\) Total no. of moles \({\rm{ = 0}}{\rm{.07 + 0}}{\rm{.06 = 0}}{\rm{.13}}{\mkern 1mu} {\mkern 1mu} {\rm{moles}}\) Total number of molecules \({\rm{ = 0}}{\rm{.07 \times 06}}{\rm{.023 \times 1}}{{\rm{0}}^{{\rm{23}}}}\) \({\rm{ = 0}}{\rm{.421 \times 1}}{{\rm{0}}^{{\rm{23}}}}\) molescules [\(\because \) Product contains atoms of nitrogen and not molecules].
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY
306772
The number of molecules and moles in 2.8375 litres of \({\mathrm{\mathrm{\mathrm{O}_{2}}}}\) at STP are respectively
1 \({\mathrm{\mathrm{7.527 \times 10^{23}}}}\) and 0.125 mol
2 \({\mathrm{\mathrm{7.527 \times 10^{22}}}}\) and 0.125 mol
3 \({\mathrm{\mathrm{1.505 \times 10^{23}}}}\) and 0.250 mol
4 \({\mathrm{\mathrm{7.527 \times 10^{22}}}}\) and 0.250 mol
Explanation:
Number of moles of \({\mathrm{\mathrm{O}_{2}}}\) at \({\mathrm{\mathrm{STP}=\dfrac{2.8375 \mathrm{~L}}{22.4 \mathrm{~L}}}}\) \({\mathrm{=0.126 \mathrm{~mol} \simeq 0.125 \mathrm{~mol}}}\) Number of molecules of \({\mathrm{\mathrm{O}_{2}}}\) at STP \({\mathrm{=0.125 \times 6.022 \times 10^{23}=0.7527 \times 10^{23}}}\) (or) \({\mathrm{7.527 \times 10^{22}}}\)
JEE - 2023
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY
306773
Which of the following element can exist as atomicity 8?
1 H
2 O
3 S
4 N
Explanation:
Sulphur exists in octa atomic molecule i.e., \({{\rm{S}}_{\rm{8}}}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY
306774
A compound has \(\mathrm{20 \%}\) of nitrogen by weight. If one molecule of the compound contains two nitrogen atoms, the molecular weight of the compound is
1 35
2 70
3 140
4 280
Explanation:
Mass of two nitrogen atoms \(\mathrm{=28 \mathrm{~g}}\) Compound has \(\mathrm{20 \%}\) nitrogen, means \(\mathrm{20 \mathrm{~g}}\) nitrogen is present in \(\mathrm{100 \mathrm{~g}}\) compound \(\mathrm{28 \mathrm{~g}}\) nitrogen is present in ? g compound ? \(\mathrm{=\dfrac{28 \times 100}{20}=140 \mathrm{~g}}\) compound
306771
A 5 L vessel contains 2.8 g of \({{\rm{N}}_{\rm{2}}}\). When heated to 1800 K, 30% molecules are dissociated into atoms. Identify the correct statement.
1 Total number of moles in the container will be 0.13.
2 Total number of molecules in the container will be \({\rm{0}}{\rm{.78 \times 1}}{{\rm{0}}^{{\rm{23}}}}\).
3 Total number of atoms in the container will be 0.06.
4 All of the above.
Explanation:
30% molecules are dissociated as \({{\rm{N}}_{\rm{2}}} \to {\rm{2N}}\) Amount of \({{\rm{N}}_{\rm{2}}}\) left (in moles) \({\rm{ = }}\frac{{{\rm{2}}{\rm{.8}}}}{{{\rm{28}}}}{\rm{ \times }}\frac{{{\rm{70}}}}{{{\rm{100}}}}\) \({\rm{ = 0}}{\rm{.1 \times 0}}{\rm{.7 = 0}}{\rm{.07}}\) No. of moles of N atoms formed \({\rm{ = 2 \times }}\frac{{{\rm{30}}}}{{{\rm{100}}}}{\rm{ \times }}\frac{{{\rm{2}}{\rm{.8}}}}{{{\rm{28}}}}\) \({\rm{ = 0}}{\rm{.06}}\) moles. No. of atoms in container \({\rm{ = 0}}{\rm{.06 \times 6}}{\rm{.023 \times 1}}{{\rm{0}}^{{\rm{23}}}}\) \({\rm{ = 0}}{\rm{.36 \times 1}}{{\rm{0}}^{{\rm{23}}}}{\mkern 1mu} {\mkern 1mu} {\rm{moles}}\) Total no. of moles \({\rm{ = 0}}{\rm{.07 + 0}}{\rm{.06 = 0}}{\rm{.13}}{\mkern 1mu} {\mkern 1mu} {\rm{moles}}\) Total number of molecules \({\rm{ = 0}}{\rm{.07 \times 06}}{\rm{.023 \times 1}}{{\rm{0}}^{{\rm{23}}}}\) \({\rm{ = 0}}{\rm{.421 \times 1}}{{\rm{0}}^{{\rm{23}}}}\) molescules [\(\because \) Product contains atoms of nitrogen and not molecules].
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY
306772
The number of molecules and moles in 2.8375 litres of \({\mathrm{\mathrm{\mathrm{O}_{2}}}}\) at STP are respectively
1 \({\mathrm{\mathrm{7.527 \times 10^{23}}}}\) and 0.125 mol
2 \({\mathrm{\mathrm{7.527 \times 10^{22}}}}\) and 0.125 mol
3 \({\mathrm{\mathrm{1.505 \times 10^{23}}}}\) and 0.250 mol
4 \({\mathrm{\mathrm{7.527 \times 10^{22}}}}\) and 0.250 mol
Explanation:
Number of moles of \({\mathrm{\mathrm{O}_{2}}}\) at \({\mathrm{\mathrm{STP}=\dfrac{2.8375 \mathrm{~L}}{22.4 \mathrm{~L}}}}\) \({\mathrm{=0.126 \mathrm{~mol} \simeq 0.125 \mathrm{~mol}}}\) Number of molecules of \({\mathrm{\mathrm{O}_{2}}}\) at STP \({\mathrm{=0.125 \times 6.022 \times 10^{23}=0.7527 \times 10^{23}}}\) (or) \({\mathrm{7.527 \times 10^{22}}}\)
JEE - 2023
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY
306773
Which of the following element can exist as atomicity 8?
1 H
2 O
3 S
4 N
Explanation:
Sulphur exists in octa atomic molecule i.e., \({{\rm{S}}_{\rm{8}}}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY
306774
A compound has \(\mathrm{20 \%}\) of nitrogen by weight. If one molecule of the compound contains two nitrogen atoms, the molecular weight of the compound is
1 35
2 70
3 140
4 280
Explanation:
Mass of two nitrogen atoms \(\mathrm{=28 \mathrm{~g}}\) Compound has \(\mathrm{20 \%}\) nitrogen, means \(\mathrm{20 \mathrm{~g}}\) nitrogen is present in \(\mathrm{100 \mathrm{~g}}\) compound \(\mathrm{28 \mathrm{~g}}\) nitrogen is present in ? g compound ? \(\mathrm{=\dfrac{28 \times 100}{20}=140 \mathrm{~g}}\) compound
