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-Dominant- [34]
3 years ago
9

The molar mass of a substance is 92.010g. The substance is 30.4% nitrogen and 69.9% oxygen. What is the empirical formula and th

e molecular formula of the substance
Chemistry
1 answer:
Veronika [31]3 years ago
6 0

Answer:

Empirical formula = NO₂

Molecular formula = N₂O₄

Explanation:

Percentage mass of Nitrogen = 30.4 %

Percentage mass of Oxygen = 60.9 %

Mole ratio of the elements:

Nitrogen = 30.4/14 = 2.17

Oxygen = 69.9/16 = 4.37

Dividing by the smallest ratio to obtain a simple ratio

Nitrogen: 2.17/2.17 = 1

Oxygen; 4.37/2.17 = 2

Therefore, the simplest mole ratio is 1:2

Empirical formula = NO₂

Molecular formula = n(empirical formula), therefore, molecular mass = n *(empirical mass)

92.010 = n(14 + 32)

92.010 = 46n

n = 92.010/46

n = 2

Therefore, molecular formula = 2(NO₂)

Molecular formula = N₂O₄

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5.758  is the density of the metal ingot in grams per cubic centimeter.

Explanation:

1) Mass of pycnometer = M = 27.60 g

Mass of pycnometer with water ,m= 45.65 g

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998.2 kg/m^3=\frac{998.2 \times 1000 g}{10^6 cm^3}=0.9982 g/cm^3

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2) Mass of metal , water and pycnometer = 56.83 g

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Mass of water when metal and water are together ,m''= 56.83 g - M'- M

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Since volume cannot be in negative .

Density of the metal =d'

=d'=\frac{M'}{v'}=\frac{9.5 g}{1.65 cm^3}=5.758 g/cm^3

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