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Chemistry
3. Atoms and Molecules
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Q8 of 75 Page 85

Which of the following correctly represent 360 g of water?

I. 2 moles of H2O


II. 20 moles of water


III. 6.022 × 1023 molecules of water


IV. 1.2044 × 1025 molecules of water


⇒


⇒ Number of moles = 20


Number of molecules = 20 × 6.022 × 1023


= 1.2044 × 1025 molecules of water


Thus, option (d) is correct.

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6

During an experiment hydrogen (H2) and oxygen (O2) gases reacted in an electric are to produce water as

follows: 2H + O2 2H2O


The experiment is repeated three times and data tabulated as shown below:



During 3rd experiment the researcher forgot to list masses of H2 and O2 used. So, if the law of constant proportion is correct then find mass of O2 used during 3rd experiment.

7

Nitrogen and hydrogen combine together to form ammonia.

N2 + 3H2→ 2NH3


[Relative atomic masses of N = 14 u, H = 1 u]


The mass of nitrogen and hydrogen which combine together to form 6.8 g ammonia is

9

3.42 g of glucose are dissolved in 18 g of water in a beaker. The number of oxygen atoms in the solution is

10

Which of the following contains maximum number of molecules?

Questions · 75
3. Atoms and Molecules
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