Question

the weight of 0.5 mole of Methane is​

Answer 1

Answer:Methane -. CH4

Molar mass: Atomic mass of C + Atomic mass of H

= 1×12+4×1

= 16u = 16g

No. Of moles= Given mass /Molar mass

0.5 = Given mass / 16

Therefore , Given mass = 16 × 0.5 = 8 g

And: 8g

Answer 2

0.5 moles of methane weigh 8 g.

Given,

Moles of methane=0.5.

To find,

the weight of 0.5 mole of methane.

Solution:

• Moles is equal to the ratio of the given mass of a substance and its molar mass.
• Moles=Given mass/Molar mass.
• Moles of a gas is equal to the ratio of the volume of the gas(in litres) at STP and 22.4.
• Molecular formula of methane-CH4.
• Atomic mass of H=1 amu.
• Atomic mass of C=12 amu.
• CH4=12+(1x4)
• CH4=12+4
• CH4=16 amu.
• The molar mass of methane is 16 g.

Moles=Given mass/Molar mass

0.5=Mass/16

Mass=16x0.5

Mass=8 g.

The mass of 0.5 moles of methane is 8 g.

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