Calculate the number of molecules in $0.5$ mole of water.
- A$3.011 \times 10^{23}$ molecules
- B$6.022 \times 10^{23}$ molecules
- C$1.204 \times 10^{23}$ molecules
- D$3.011 \times 10^{22}$ molecules
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Give one example each of:
$(a)$ Triatomic element
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$(c)$ Polyatomic element
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$(a)$ Triatomic element
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$(c)$ Polyatomic element
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View SolutionDefine formula unit mass of a compound. Calculate the formula unit mass of:
$(a)$ $Na_{2}CO_{3} \cdot 10H_{2}O$
$(b)$ $CuSO_{4}$
(Given atomic mass of $Na = 23 \text{ u}, C = 12 \text{ u}, O = 16 \text{ u}, Cu = 63.5 \text{ u}, S = 32 \text{ u}, H = 1 \text{ u}$)
$(a)$ $Na_{2}CO_{3} \cdot 10H_{2}O$
$(b)$ $CuSO_{4}$
(Given atomic mass of $Na = 23 \text{ u}, C = 12 \text{ u}, O = 16 \text{ u}, Cu = 63.5 \text{ u}, S = 32 \text{ u}, H = 1 \text{ u}$)
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View SolutionHelium atom has $2$ electrons in its valence shell,but its valency is not $2$. Explain.
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