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Gay Lussac's Law, Avagadro's Law

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Question

Calculate the number of moles of magnesium present in a magnesium ribbon weighing 12 g. Molar atomic mass of magnesium is 24 g mol $^{- 1}$ .

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Solution

Given the mass of the magnesium ribbon is 12 g and the molar mass of magnesium is 24 g mol $^{- 1}$ .

$N u m b e r o f m o l e s = \frac{G i v e n m a s s}{M o l a r m a s s} = \frac{12 g}{24 g m o l^{- 1}} = 0.5 m o l e s$

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Q. A student wants to have 3.011 × 10²³ atoms each of magnesium and carbon elements. For this purpose, he will have to weigh :
(a) 24 g of magnesium and 6 g of carbon
(b) 12 g of carbon and 24 g of magnesium
(c) 20 g of magnesium and 10 g of carbon
(d) 12 g of magnesium and 6 g of carbon

Q. Question 23
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