Question

→Calculate the number of moles present in:
i) 60g of calcium
ii) 3.011 × 10²³ number of oxygen atoms.
(Given that, Ca= 40 u, Avagadro's number= 6.022 × 10²³ per mole)​

Answer 1

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$\huge\mathfrak{Answer:-}$

⏩ i) Number of moles

n= m/M

= Given mass in grams/ Molar mass

= 60/40 = 1.5

ii) 1 mole = 6.022 × 10²³

Number of moles , n = N/N0

= Given number of particles/ Avagadro's number

= 3.011 × 10²³/ 6.022 × 10²³

= 1/2

= 0.5

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Answer 2

Answer:

40 g of calcium is equivalent to 1 mole

so, 60 g of calcium is equivalent to 60/40=3/2 mole

6.022*10^23 is equivalent to 1 mole

so ,3.011*10^23 is equivalent to 1/2 mole

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