1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Dima020 [189]
3 years ago
13

A compound is found to be 30.45% n and 69.55 % o by mass. if 1.63 g of this compound occupy 389 ml at 0.00°c and 775 mm hg, what

is the molecular formula of the compound?
Chemistry
1 answer:
Charra [1.4K]3 years ago
3 0
1) mass composition

N: 30.45%
O: 69.55%
   -----------
   100.00%

2) molar composition

Divide each element by its atomic mass

N: 30.45 / 14.00 = 2.175 mol

O: 69.55 / 16.00 = 4.346875

4) Find the smallest molar proportion

Divide both by the smaller number

N: 2.175 / 2.175 = 1

O: 4.346875 / 2.175 = 1.999 = 2

5) Empirical formula: NO2

6) mass of the empirical formula

14.00 + 2 * 16.00 = 46.00 g

7) Find the number of moles of the gas using the equation pV = nRT

=> n = pV / RT = (775/760) atm * 0.389 l / (0.0821 atm*l /K*mol * 273.15K)

=> n = 0.01769 moles

8) Find molar mass

molar mass = mass in grams / number of moles = 1.63 g / 0.01769 mol = 92.14 g / mol

9) Find how many times the mass of the empirical formula is contained in the molar mass

92.14 / 46.00 = 2.00

10) Multiply the subscripts of the empirical formula by the number found in the previous step

=> N2O4

Answer: N2O4
You might be interested in
Sodium is a compound<br> O True<br> or<br> O False
MA_775_DIABLO [31]

Answer:

i think false.

Explanation:

tell me if this is wrong

6 0
3 years ago
Read 2 more answers
using the Bohr model for hydrogen: energy = hc/wavelength = 2.18 x 10^-18 Joules (1/nf2 - 1/ni2) N=15 to n=5
soldier1979 [14.2K]

Answer:

Energy lost is 7.63×10⁻²⁰J

Explanation:

Hello,

I think what the question is requesting is to calculate the energy difference when an excited electron drops from N = 15 to N = 5

E = hc/λ(1/n₂² - 1/n₁²)

n₁ = 15

n₂ = 5

hc/λ = 2.18×10⁻¹⁸J (according to the data)

E = 2.18×10⁻¹⁸ (1/n₂² - 1/n₁²)

E = 2.18×10⁻¹⁸ (1/15² - 1/5²)

E = 2.18×10⁻¹⁸ ×(-0.035)

E = -7.63×10⁻²⁰J

The energy lost is 7.63×10⁻²⁰J

Note : energy is lost / given off when the excited electron jumps from a higher energy level to a lower energy level

5 0
3 years ago
The atomic number is the same as the number of ________.
Zanzabum

Answer:

number of electrons

Explanation:

(happy to help)

5 0
3 years ago
How many grams of O are in 905 grams of Na2O? ​
galben [10]

Answer:

301.7g

Explanation:

So there's 1 out of 3 are Oxygen.

905 / 3 = 301.7

8 0
3 years ago
Which statement is true about the cells of non-living objects? A. They have prokaryotic cells. B. They have eukaryotic cells. C.
zloy xaker [14]
D, obviously. All living things are made of one or more cells, therefore non-living things aren’t made of cells
8 0
3 years ago
Other questions:
  • Which is true of a solute dissolved in a solvent? the solute raises the boiling point of the solvent. the solvent decreases the
    15·1 answer
  • To form a stable ion will magnesium gain or lose electrons how many electrons
    15·1 answer
  • If solar panels are placed under the sun at noon, then they will produce more energy than solar panels placed in the sun at dawn
    14·1 answer
  • This form of matter does not have definite shape and is not easily compressed.
    13·1 answer
  • Are there a mole of golf in a 200 g gold necklace
    13·1 answer
  • Which set of numbers gives the correct possible values of l for n = 2
    5·2 answers
  • What happens to gas particles when they are compressed?
    10·1 answer
  • Type the correct answer in the box. Spell all words correctly. In which system are both energy and matter exchanged with the sur
    7·1 answer
  • What type of reaction is shown below?<br>A. hydration reaction <br>B.addition reaction​
    7·1 answer
  • Aqueous hydrobromic acid reacts with solid sodium hydroxide to produce aqueous sodium bromide and liquid water . What is the the
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!