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Sladkaya [172]
3 years ago
6

Certain metals react with acids to form hydrogen and salts of that metal. When sulfuric acid and aluminum combine, hydrogen gas

and aluminum sulfate form. How many grams of sulfuric acid will need to fall on aluminum to consume 140.11 milligrams of aluminum?
Chemistry
1 answer:
Tasya [4]3 years ago
6 0

Answer: 7.622g of sulphuric acid

Explanation:

3H2SO4 + 2Al -> Al2(SO4)3 + 3H2

3 moles of H2SO4 needs 2 moles of Al

(3 x 98)g of H2SO4 needs (2 x 27)g of Al

294g of H2SO4 needs 54g of Al

29400mg of H2SO4 needs 5400mg of Al

1mg of Al = 294/54 = 5.44mg of Al

140.11mg of Al = 140.11 x 5.44

                       = 762.2mg  = 762.2/100 = 7.622gof sulphuric acid

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Dominik [7]

Answer: Potassium Chloride

Explanation:

4 0
3 years ago
An air sample contains 0.044% CO2? If the total pressure is 750 mm Hg. What is the partial pressure of CO2?2?
Aleksandr [31]
Partial pressure=mole fraction×Pt
x=0.044÷44(maolarmass of CO2)×Pt
x=0.044÷(44)2×Pt
x=5×10^-4×Pt
x=5×10^-4×Pt
where Pt:1atm=760mmHg
xatm=750mmHg
750×1÷760=0.99
now;5×10^-4×099=4.95×10^-4.
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8 0
3 years ago
A small portion of a crystal lattice is sketched below. What is the name of the unit cell of this lattice? Your answer must be a
Nikolay [14]

This is an incomplete question, the given sketch is shown below.

Answer : The name of given unit cell is, FCC (face-centered cubic unit cell)

Explanation :

Unit cell : It is defined as the smallest 3-dimensional portion of a complete space lattice which when repeated over the and again in different directions produces the complete space lattice.

There are three types of unit cell.

  • SCC (simple-centered cubic unit cell)
  • BCC (body-centered cubic unit cell)
  • FCC (face-centered cubic unit cell)

In SCC, the atoms are arranged at the corners.

Z=\frac{1}{8}\times 8=1

The number of atoms of unit cell = Z = 1

In BCC, the atoms are arranged at the corners and the body center.

Z=\frac{1}{8}\times 8+1=2

The number of atoms of unit cell = Z = 2

The given unit cell is, FCC because the atoms are arranged at the corners and the center of the 6 faces.

Z=\frac{1}{8}\times 8+\frac{1}{2}\times 6=4

The number of atoms of unit cell = Z = 4

Thus, the name of given unit cell is, FCC (face-centered cubic unit cell)

7 0
4 years ago
Hey need help. this is ONE question a 4 part one though. pls help
shusha [124]
I don’t get it. What is the question asking?
3 0
3 years ago
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How is rubidium used
Virty [35]

Answer:

Rubidium is used in vacuum tubes as a getter, a material that combines with and removes trace gases from vacuum tubes. It is also used in the manufacture of photocells and in special glasses. Since it is easily ionized, it might be used as a propellant in ion engines on spacecraft.

Symbol: Rb (37)

Atomic Weight: 85.4678

Atomic Number: 37

Number of Stable Isotopes: 1 (View all isotope .

6 0
3 years ago
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