Question

the mass of 10 molecules of napthalene (C10H8) is​

Answer 1

Answer:

=>10×12 + 8×1=120+8= 128 g.

Explanation:

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Answer 2

Answer:-

2.125×10⁻²¹ g

Explanation:-

Molar mass of Napthalene [C₁₀H₈]:-

= 12×10+1×8

= 128g

• Avogadro Number = 6.022×10²³

Firstly, let's calculate the number of moles in 10 molecules of Napthalene:-

∵ No of molecules

= No of moles × Avogadro number

∴ No of moles

= No of molecules/ Avovadro number

=> Number of moles = 10/6.022×10²³

[ We are keeping the number of moles into fraction form for simplification of calculations in the next step ]

Now, we know that:-

Mass = No of moles × Molar mass

=> Mass = 10/6.022×10²³ × 128

= 1280/6.022×10²³

= 212.5/10²³

= 212.5×10⁻²³

= 2.125×10⁻²¹ g

Thus, the mass of 10 molecules of Napthalene is 2.125×10⁻²¹g.