Some Basic Concepts of Chemistry

1. A.
   $6.022 \times 10^{23}$
2. B.
   $1.8066 \times 10^{25}$
3. C.
   $6.022 \times 10^{24}$
4. D.
   $1.2044 \times 10^{25}$

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1. A.
   $22.4$ L
2. B.
   $44.8$ L
3. C.
   $11.2$ L
4. D.
   $33.6$ L

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1. A.
   $4.5$ g
2. B.
   $0.25$ g
3. C.
   $18$ g
4. D.
   $5.4$ g

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1. A.
   $2.011 \times 10^{22}$
2. B.
   $3.011 \times 10^{22}$
3. C.
   $6.022 \times 10^{22}$
4. D.
   $0.1 \times 10^{23}$

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1. A.
   $18$ grams of water
2. B.
   $24$ grams of dioxygen
3. C.
   $22$ grams of carbon dioxide
4. D.
   $16$ grams of methane

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1. A.
   Atoms of nitrogen $= 4.818 \times 10^{23}$ and atoms of sodium $= 3.011 \times 10^{22}$.
2. B.
   Atoms of nitrogen $= 6.022 \times 10^{23}$ and atoms of sodium $= 4.802 \times 10^{22}$.
3. C.
   Atoms of nitrogen $= 1.204 \times 10^{23}$ and atoms of sodium $= 5.604 \times 10^{22}$.
4. D.
   Atoms of nitrogen $= 3.011 \times 10^{23}$ and atoms of sodium $= 1.204 \times 10^{22}$.

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1. A.
   $\dfrac{1}{2}$ mole
2. B.
   $\dfrac{1}{3}$ mole
3. C.
   $\dfrac{1}{4}$ mole
4. D.
   $\dfrac{2}{3}$ mole

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1. A.
   $65.5$
2. B.
   $67.5$
3. C.
   $66.5$
4. D.
   $66$

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1. A.
   Ampere
2. B.
   Coulomb
3. C.
   Candela
4. D.
   Ohm

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1. A.
   CH$_4$, CCl$_4$
2. B.
   BF$_3$, NH$_3$
3. C.
   CO, CO$_2$
4. D.
   NO$_2$, CO$_2$

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