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
sattari [20]
3 years ago
14

What is the molecular formula for a compound that is 44.87% potassium, 36.7%

Chemistry
1 answer:
Phoenix [80]3 years ago
5 0

Answer:

Molecular formula: S4K8O16  empirical formula: SK2O4

Explanation:

First we find the moles of each by first finding grams (using the percent) and then using stoichiometry to convert into moles:

Sulfur: 696 *.18 = 125.28grams S* \frac{1 mole S}{32.065 g S} = 3.907 moles S

Potassium: 696 *.4487 = 312.2952 *\frac{1 mole K}{39.08 g K}= 7.99117 mole K

Oxygen: 696 * .367 = 255.432 * \frac{1 mol O}{16g O} = 15.9654 mole O

Then we divide each value by the atom with the smallest number of moles to find the mole ratio:

3.907/3.907= 1

7.99117 mole K/ 3.907= 2.043

15.9654 mole O/ 3.907= 4.08

The empirical formula is SK2O4

To find the molecular formula, we divide the mass given (696) by the mass of the empirical formula (174.22) to get 4. We then divide each atom by 4.

Molecular formula: S4K8O16

You might be interested in
Which of the following is a chemical change?
ValentinkaMS [17]
Answer: A - it is changing into a new substance

the other answers are just physical changes
4 0
3 years ago
How many protons, neutrons and electrons are there in a neutral Cesium atom?
ale4655 [162]

Answer:

55 protons, 78 neutrons, 55 electrons

Explanation:

In a neutral Cesium atom we have 55 protons, 78 neutrons and 55 electrons. This can be found on the periodic table of elements.

Protons are the positively charged particles within an atom

Neutrons do not carry any charges.

Electrons are the negatively charged particles.

The amount of these subatomic particles can be obtained from the periodic table of element.

For a neutral atom, the number of protons and electrons are the same.

Since the atomic number is 55, it is also the number of protons in the atom.

6 0
3 years ago
During a phase change, the temperature of a substance _____.
adell [148]

Answer: remains constant.


Justification:


1) The phase changes are:


i) Boiling: pass from liquid to gas (absorbs heat energy)

ii) Condensation: pass from gas to liquid (release heat energy)

iii) Melting: pass from solid to liquid (absorb heat energy)

iv) Freezing: pass from liquid to solid (release heat energy)

v) Sublimation: pass from solid to gas (absorbs heat energy)

vii) Deposition: pass from gas to solid (release heat energy)


2) When a phase change occurs, whichever it is, the heat energy related with the process, either absortion or release, is used, to overcome the intermolecular forces (in the case of heat energy absortion) or to create stronger intermolecular forces (in the case of heat energy release).


Because of that, the heat energy exchange does not change the temperature of the substance.

8 0
3 years ago
Read 2 more answers
What conversion factor will help solve the problem?
Scorpion4ik [409]

Answer:

i fond nothing sooory

pic so PC

5 0
3 years ago
What is the order of decreasing ionization energy?
Hatshy [7]
Your answer would be 3!!

6 0
3 years ago
Other questions:
  • Compare the temperature dependence of the conductivity for metals and intrinsic semiconductors. briefly explain the difference i
    5·1 answer
  • Number of electrons absorbed by the main energy level (n = 4):
    6·1 answer
  • The protons and neutronsA. leave the nucleus often.B. never leave the nucleus.C. spend all their time outside the nucleus.
    9·1 answer
  • 54. Write a formula for the ionic compound that forms from
    15·1 answer
  • Why is it necessary to determine if a reactant is a limiting reagent in a reaction
    5·1 answer
  • Onsider this representation of an original DNA sequence: THE TALL MAN WAS SAD.
    7·2 answers
  • **A piece of marble (assume it is pure CaCO3) reacts with 2.00L of 2.52 M HCl. After dissolution of the marble, a 10.00 mL sampl
    15·1 answer
  • Which claim about the universality of gravity is not supported by evidence?
    8·1 answer
  • If 85.0 L of helium at 29.0°C is compressed to 32.0 L at constant pressure, what is the new temperature?
    8·1 answer
  • Can someone please help me? :(
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!