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
aleksley [76]
3 years ago
5

What is the minimum mass of magnetite (Fe,O2), a iron ore, from which 120. g of pure iron could be extracted? Be sure your answe

r has a unit symbol, if necessary, and is rounded to 3 significant digits.
Chemistry
1 answer:
Schach [20]3 years ago
6 0

Answer:

166 g

Explanation:

Step 1: Write the reaction for the obtaining of Fe from magnetite

Fe₃O₄ ⇒ 3 Fe + 2 O₂

Step 2: Calculate the moles corresponding to 120 g of Fe

The molar mass of Fe is 55.85 g/mol.

120 g × (1 mol/55.85 g) = 2.15 mol

Step 3: Calculate the moles of Fe₃O₄ required to produce 2.15 moles of Fe

The molar ratio of Fe₃O₄ to Fe is 1:3. The moles of Fe₃O₄ required are 1/3 × 2.15 mol = 0.717 mol

Step 4: Calculate the mass corresponding to 0.717 moles of Fe₃O₄

The molar mass of Fe₃O₄ is 231.53 g/mol.

0.717 mol × 231.53 g/mol = 166 g

You might be interested in
Which two elements on the periodic table are in the same period?
emmainna [20.7K]

Answer:

Platinum and Gold ig.

6 0
3 years ago
The radioactive isotope of lead, Pb-209, decays at a rate proportional to the amount present at time t and has a half-life of 3.
Marina86 [1]

Answer:

Therefore it will take 7.66 hours for 80% of the lead decay.

Explanation:

The differential equation for decay is

\frac{dA}{dt}= kA

\Rightarrow \frac{dA}{A}=kdt

Integrating both sides

ln A= kt+c₁

\Rightarrow A= e^{kt+c_1}

\Rightarrow A=Ce^{kt}         [e^{c_1}=C]

The initial condition is A(0)= A₀,

\therefore A_0=Ce^{0.k}

\Rightarrow C=A_0

\therefore A=A_0e^{kt}.........(1)

Given that the Pb_{209}  has half life of 3.3 hours.

For half life A=\frac12 A_0 putting this in equation (1)

\frac12A_0=A_0e^{k\times3.3}

\Rightarrow ln(\frac12)= 3.3k     [taking ln both sides, ln \ e^a=a]

\Rightarrow k=\frac{ln \frac12}{3.3}

⇒k= - 0.21

Now A₀= 1 gram, 80%=0.8

and A= (1-0.8)A₀ = (0.2×1) gram = 0.2 gram

Now putting the value of k,A and A₀in the equation (1)

\therefore 0.2=1e^{(-0.21)\times t}

\Rightarrow e^{-0.21t}=0.2

\Rightarrow -0.21t= ln(0. 2)

\Rightarrow t= \frac{ln (0.2)}{-0.21}

⇒ t≈7.66

Therefore it will take 7.66 hours for 80% of the lead decay.

3 0
3 years ago
Which is longer DNA or chromosone
Sliva [168]

Answer:

DNA

Explanation: Because if you stretch DNA it gets longer.

8 0
3 years ago
Read 2 more answers
The force of gravity always pulls ____
damaskus [11]
Down...
and if you were wondering, the earth pushes back
6 0
3 years ago
What type of chemical reaction will Ca LiOH → make
cricket20 [7]

Answer:

It is not possible to determine the type of chemical reaction that will occur when Ca LiOH → without additional information. The chemical formula Ca LiOH could represent a compound, but without knowing what reactants are present and what products are being formed, it is not possible to classify the reaction. Some possible reactions that could occur involving Ca LiOH include a synthesis reaction, where Ca LiOH is formed from its constituent elements, a decomposition reaction, where Ca LiOH breaks down into its constituent elements, or a substitution reaction, where one or more atoms in Ca LiOH are replaced by other atoms.

Explanation:

3 0
1 year ago
Other questions:
  • 1.674 x 10^–24 g of neutrons is how many atomic mass units (amu)?
    7·2 answers
  • If a tablet of acetaminophen, C8H9NO2, weighs 324 mg, how many moles are there in the tablet? If a tablet of acetaminophen, C8H9
    8·1 answer
  • Acetonitrile (CH3CN) is an important industrial chemical. Among other things, it is used to make plastic moldings, which have mu
    13·1 answer
  • If carbon lost one proton, what atom would be formed
    12·1 answer
  • For this ionic compound, what would be the name of the anion? Ca(NO3)2
    15·2 answers
  • old blooded animals modulate the fatty acid composition of their membranes as a function of temperature in order to A) ensure co
    9·1 answer
  • Hat is the definition for a scientific theory? A. an informed explanation that can be tested but is not widely accepted B. an ex
    6·2 answers
  • 6/10
    9·1 answer
  • A. The unknown sample was purple in color and was verified to only contain blue and red dyes.
    15·1 answer
  • A _____ activation energy is required to break the double bonds of unsaturated hydrocarbons. high extreme large low
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!