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deff fn [24]
3 years ago
10

Suppose that 4.9 mol no2 and 0.40 mol h2o combine and react completely. which reactant is in excess?

Chemistry
1 answer:
Elina [12.6K]3 years ago
4 0
Answer is: NO₂ (nitrogen (IV) oxide) <span>is in excess.

Balanced chemical reaction: </span>3NO₂(g) + H₂O(l) → 2HNO₃<span>(l) + NO(g).
n(</span>NO₂) = 4.9 mol.
n(H₂O) = 0.4 mol.
From chemical reaction: n(NO₂) :(H₂O) = 1 : 3.
For 0.4 mole of water, we need: 0.4 mol : n(NO₂) = 1 : 3; n(NO₂) = 1.2 mol.
Because we have more than 1.2 moles of nitrogen(IV) oxide, this molecule is in excess.
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1.34 moles are in 135g of Teflon.

Explanation:

Molecular formula of teflon is (C2H4)n

mass of teflon = 135 grams

atomic mass of teflon = 100.01 gram/mole

number of moles of teflon = ?

Formula used to calculate number of moles in a substance is given as:

number of moles = \frac{mass}{atomic mass of 1 mole}

putting the values in the above equation:

number of moles = \frac{135}{100.01}

number of moles = 1.34 moles

Teflon is polymer which is used for making non-stick coating, in 135 grams of teflon there are 1.34 moles in it.

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