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
Alex73 [517]
3 years ago
8

what is the empirical formula for a compound that is 50.61% copper 11.16% nitrogen and 38.23% oxygen

Chemistry
1 answer:
jonny [76]3 years ago
8 0

Answer:

CuNO3

Explanation:

In order to calculate the empirical formula in this question;

Cu = 50.61% = 50.61g

N = 11.16% = 11.16g

O = 38.23% = 38.23g

Next, we convert each gram unit to moles by dividing by their respective molar mass (Where; Cu = 63.55, N = 14, O = 16)

Cu = 50.61 ÷ 63.55 = 0.796mol

N = 11.16 ÷ 14 = 0.797mol

O = 38.23 ÷ 16 = 2.389mol

Next, we divide each mole value by the smallest (0.796)

Cu = 0.796mol ÷ 0.796 = 1

N = 0.797mol ÷ 0.796 = 1.001

O = 2.389mol ÷ 0.796 = 3.001

Approximately, the simple whole number ratio between Cu, N and O is 1:1:3, hence, the empirical formula is CuNO3.

You might be interested in
1. How many molecules of S2 gas are in 756.2 L?
AfilCa [17]

Answer: There are 2.032 \times 10^{25} molecules S_{2} gas are in 756.2 L.

Explanation:

It is known that 1 mole of any gas equals 22.4 L at STP. Hence, number of  moles present in 756.2 L are calculated as follows.

Mole = \frac{Volume}{22.4 L}\\= \frac{756.2 L}{22.4 L}\\= 33.76 mol

According to mole concept, 1 mole of every substance contains 6.022 \times 10^{23} molecules.

Therefore, molecules of S present in 33.76 moles are calculated as follows.

1 mol = 6.022 \times 10^{23}\\33.76 mol = 33.76 \times 6.022 \times 10^{23}\\= 2.032 \times 10^{25}

Thus, we can conclude that there are 2.032 \times 10^{25} molecules S_{2} gas are in 756.2 L.

5 0
3 years ago
Select the conjugate acid-base pair(s). a) HI, I b) HCHO2, SO4^2- c) CO3^2-, HCI d) PO4^3-, HPO4^2-
Semenov [28]

Answer:

d) PO4^3-, HPO4^2-

Explanation:

Basically, an acid and a base which differs only by the presence or absence of  proton (hydrogen ion) are called a conjugate acid-base pair.

a) HI, I

This is incorrect. For the acid, HI the conjugate base is I⁻ ion.

b) HCHO2, SO4^2-

This is incorrect, there's no relationship between both entities.

c) CO3^2-, HCI

This is incorrect, there's no relationship between both entities.

d) PO4^3-, HPO4^2-

This is correct. The difference between both entities is the Hydrogen ion. This is the conjugate acid-base pair

6 0
3 years ago
Which of the following abilities is NOT a physical property of matter?
Morgarella [4.7K]

Answer:

Ability to react chemically with other substances is not a physical property.

Explanation:

The ability to dissolve in other substance can be both physical and chemical property.

It depend upon the type of solute, solvent and reaction between them.

For example, if NaCl is dissolved in water it gives sodium and chloride ions which are behaving different from the original compound. it will be chemical change but if water is evaporated it will give back sodium chloride and than it will be a physical change.

But if dissolved substances make the mixture not compound it will than a physical change, and solubility will consider a physical property.

Physical properties:

The properties which are not associated with change in chemical composition are called physical properties.                                                                                          

Example

Density, color, hardness, conductance, melting point, boiling points all  are physical properties.

Chemical properties:

The properties which are associated with change in chemical composition are called chemical properties.        

Example:

Toxicity, flammability, heat of combustion etc.

Combustion of fuel or wood: that oil or wood convert into energy, CO2 and ash in case of wood

The reaction of Hydrogen and oxygen:

H 2 (g)  + O 2  (g) -------------------------------------> 2H 2O  (l)

8 0
3 years ago
The hair on Jamal’s arms is standing straight up.
Alex_Xolod [135]
Jamal’s hair is behaving that way because he is in a cold area.
8 0
3 years ago
What is the purpose of a rain gauge?
FromTheMoon [43]
A rain gauge<span> (also known as an udometer, pluviometer, or an ombrometer) is an instrument used by meteorologists and hydrologists to gather and measure the amount of liquid precipitation over a set period of time.

i hope that helps</span>
7 0
3 years ago
Read 2 more answers
Other questions:
  • Assume 3 molecules of Fe react according to the following equation. 3Fe + 4H2O Fe3O4 + 4H2 How many molecules of H2 are produced
    11·2 answers
  • What human life process requires hydrochloric acid? <br><br> THANKS!!!
    11·1 answer
  • Suggest a way of improving
    11·1 answer
  • What is difference between cathod ray and electricity
    11·1 answer
  • An atom emits a photon of wavelength 1.08 meters. What is the energy change occurring in the atom due to this emission? (Planck'
    14·2 answers
  • A chemical reaction produced 177.3 grams of chlorine has (Cl²). What was the volume of the gas?
    12·1 answer
  • How does the solubility of a gas in a liquid depend on pressure? how does this pressure dependence account for the bubbling that
    10·1 answer
  • What is the surface composition of planets in the solar system?
    11·1 answer
  • Word equation for ethanol+ethanoic acid<br>​
    13·1 answer
  • Which does not apply to dihydroxyacetone?
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!