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
mina [271]
3 years ago
11

A 400g sample is found to be 27% aluminum. What is the mass percent of A1 in the sample?

Chemistry
1 answer:
Roman55 [17]3 years ago
8 0

34.59%

Explanation:
In order to calculate the mass percent of aluminum in that ionic compound, we're going to need two things:
1: The formula mass of the entire compound

2: The atomic mass of aluminum

The formula mass of aluminum hydroxide is
78.00
g
m
o
l
because:
26.98
g
m
o
l
+
3
(
16.00
g
mol
)
+
3
(
1.0079
g
mol
)

=
78.00
g
m
o
l

We already know the atomic mass of aluminum since that's already given.
Now, we have to use the following equation:
https://wilsonsch3u-01-2012.wikispaces.com/Unit+4+Moles?responseToken=6fbe1bc52003b1c7d0a470e50127b3a2
https://wilsonsch3u-01-2012.wikispaces.com/Unit+4+Moles?responseToken=6fbe1bc52003b1c7d0a470e50127b3a2
The numerator represents the mass of the desired atom, which is Al in our case, and the denominator represents the mass of the entire compound. You just divide the two and multiply by 100 to obtain the percent composition:
Mass of Al
Molar Mass of Al(OH)
3
×
100
%

26.98 g/mol
78.00g/mol
×
100
%
=
34.59
%
You might be interested in
The missing components in the table to the right
Fed [463]

The missing components in the table to the right are indicated with orange letters. Use the periodic table in the tools bar and this link Web Elements to fill in the corresponding values. A B C D E F G. 2. See answers. Log in to add ... F = 737.7kJ/mol. G = 495.8kJ/mol. Explanation: We are asked some of the ...

2 answers

4 0
3 years ago
What type of change occurs when water changes from a solid to a liquid? *
Arlecino [84]
Melting 

Melting is a change in property of matter from solid to liquid

Matter is anything that occupies space and has mass. Thus, there are fundamentally three types of matter which is solid liquid and gas. But why do gases and liquids diffuse and not solids? It is because of the molecular structure of these components of matter. If we examine the molecular structure of gas the molecules are highly scattered and liquid has also almost the same structure as mediocrely scattered that these particles can easily slip through other substances unlike solid which is entirely intact.  <span> </span>
5 0
3 years ago
Stained glass is homogeneous heterogeneous.​
Serjik [45]

Answer:

It is heterogeneous as it is made up of visibly different substances or phases.

6 0
3 years ago
Which of the following uses a nonrenewable energy resource to generate energy? A. nuclear power plant B. wind farm C. fireplace
asambeis [7]

The answer is bimass power plant.

4 0
2 years ago
Gasoline has a density of .74g/mL. How many milliliter if gasoline have a mass of 2.5kg?
nata0808 [166]

Answer: 3378.4mL

Explanation:

density of Gasoline = 0.74g/mL.

Volume of gasoline in milliliter = ?

mass of gasoline = 2.5kg

(Since density is in grams per millilitre, convert mass in kilograms to grams)

If 1kg = 1000grams

2.5kg = 2.5 x 1000 = 2500grams

Recall that density is obtained by dividing the mass of a substance by its volume

i.e Density = Mass / Volume

0.74g/mL = 2500grams/Volume

Volume = (2500 grams / 0.74g/mL)

Volume = 3378.4mL

Thus, the volume of gasoline is 3378.4mL

4 0
3 years ago
Other questions:
  • Calculate the ph of a blood plasma sample with a total co2 concentration of 25.6 mm and bicarbonate concentration of 24.3 mm. th
    10·1 answer
  • which of the following is a true statement about energy? a. energy can be created and destroyed. b. energy is never created nor
    8·1 answer
  • Which statement correctly compares an atom of an alkali metal with an atom of the alkaline earth metal next to it on the periodi
    10·1 answer
  • CH3COOH mc015-1.jpg CH3COO– (aq) + H+(aq) What will happen to the chemical equilibrium of the solution if CH3COONa is added?
    8·1 answer
  • What is antifreeze used for?
    10·2 answers
  • Who was the first person who went to Mars?
    5·2 answers
  • Which is an example of the flow of heat through conduction?
    13·2 answers
  • Explain why the electron configuration of 2-3-1 represents an atom in an excited state.
    14·1 answer
  • Why carbon is a basic thing to classify as organic and inorganic compounds?​
    14·1 answer
  • 3. 2.71x1022 molecules of CO2 to atoms I NEED HELP
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!