Question

air contains n2 and o2 are in 80%,20% by volume. find molar mass of air???​

Answer 1

Answer:

28.8 g/mole ≈ 29g/mole

Explanation:

The molecular weight of air = mole fraction of nitrogen × molecular weight of nitrogen + mole fraction of oxygen × molecular weight of oxygen.

Now, mole fraction of nitrogen

= 0.80

and mole fraction of oxygen

=0.20

So, molecular weight of air = 0.8×28+0.2×32

=28.8 g/mole.

Answer 2

$❥ᴀ᭄ɴsᴡᴇʀ$

28.8 ɢ/ᴍᴏʟᴇ ≈ 29ɢ/ᴍᴏʟᴇ

ᴛʜᴇ ᴍᴏʟᴇᴄᴜʟᴀʀ ᴡᴇɪɢʜᴛ ᴏꜰ ᴀɪʀ = ᴍᴏʟᴇ ꜰʀᴀᴄᴛɪᴏɴ ᴏꜰ ɴɪᴛʀᴏɢᴇɴ × ᴍᴏʟᴇᴄᴜʟᴀʀ ᴡᴇɪɢʜᴛ ᴏꜰ ɴɪᴛʀᴏɢᴇɴ + ᴍᴏʟᴇ ꜰʀᴀᴄᴛɪᴏɴ ᴏꜰ ᴏxʏɢᴇɴ × ᴍᴏʟᴇᴄᴜʟᴀʀ ᴡᴇɪɢʜᴛ ᴏꜰ ᴏxʏɢᴇɴ.

ɴᴏᴡ, ᴍᴏʟᴇ ꜰʀᴀᴄᴛɪᴏɴ ᴏꜰ ɴɪᴛʀᴏɢᴇɴ

= 0.80

ᴀɴᴅ ᴍᴏʟᴇ ꜰʀᴀᴄᴛɪᴏɴ ᴏꜰ ᴏxʏɢᴇɴ

=0.20

ꜱᴏ, ᴍᴏʟᴇᴄᴜʟᴀʀ ᴡᴇɪɢʜᴛ ᴏꜰ ᴀɪʀ = 0.8×28+0.2×32

=28.8 ɢ/ᴍᴏʟᴇ.

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