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प्रश्न
Which of the following has maximum number of atoms?
विकल्प
18g of H2O
18g of O2
18g of CO2
18g of CH4
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उत्तर
18g of CH4
`("Mass substance" xx ("Number of atoms in the molecule") xx "N"_"A")/"Molar mass"`
18 g of O2 = 1 mole = 1 × 6.022 × 1023
= 3 × 6.022 × 1023 atoms = 1.8066 × 1024 atoms
18 g of O2 = `(18 xx 2)/32 xx 6.022 xx 10^23`
= 6.77 × 1023 atoms
18 g of CO2 = `(18 xx 3)/44 xx 6.022 xx 10^23`
= 7.39 × 1023 atoms
18 g of CH4 = `(18 xx 5)/16 xx 6.022 xx 10^23`
= 3.38 × 1024 atoms
APPEARS IN
संबंधित प्रश्न
MATCH THE COLUMNAS
| 1. Jpham Dalton | a. Neutrons |
| 2. Atom | b. Model of the atom |
| 3. Chadwick | c.The atomic theory of matter |
| 4. Rutherfrod | d. Positively charged |
| 5. Protons | e. Electricity neutral |
| 6. Nuclear fusion | f. Generator of electricity |
| 7.Gamma -rays | g. High penetrating power |
| h.Energy in sun |
WRITE SHORT ANSWER
Name three inert gases.
ANSWER IN DETAIL
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Define: Covalent bond
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(a) What is the atomic number of the element?
(b) State whether element Z is a metal or a non-metal.
(c) What type of ion (if any) will be formed by an atom of element Z? Why?
(d) What is special about the outermost electron shell of the atom of this element?
(e) Give the name and symbol of element Z.
(f) Name the group of elements to which Z belongs.
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- ammonium
- bisulphate
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Define the following term with an example.
Element
K: Potassium:: C: ______.
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Reason: Atoms have equal number of protons and electrons.
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The first scientific theory about atoms was given by J J. Thomson.
