1 - A balanced equation for the reaction is 3NH4ClO4 + 3Al -------> Al2O3 + AlCl3 + 6H2O + 3NO
2 - Ammonium perchlorate is the oxidizing agent while aluminum powder is the reducing agent.
Molar mass of aluminum oxide = 102 g/mol;
The molar mass of ammonium perchlorate =117.5 g/mol.
From the equation of reaction 3 moles of ammonium perchlorate react with 3 moles of aluminum to produce 1 mole of aluminum oxide.
That is 3 x 7.5 g of ammonium perchlorate reacts with g of aluminum to produce 102 g/mol of aluminum oxide. Also 150g.
150 g of ammonium perchlorate produces (150 * 102)/(3*117.5) g of aluminum oxide = 43.4 g of aluminum oxide.
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Density = Mass / Volume
10.5 = 500 / x
10.5x = 500
x = 50 cm^3 (1 sig fig) volume of the sphere
Volume of a sphere = 4/3 pi r^2
pi = 3.14 r = radius
50 = 4/3 pi r^3
50•3/4 = pi r^3
37.5 = pi r^3
37.5/pi = r^3
11.9 = r^3
cube root(11.9) = r
2.3 = r
Diameter = 2•radius
Diameter = 2 • 2.3
Diameter = 5 cm (1 sig fig) diameter
Answer:
7.53×10²³ molecules
Explanation:
Given data:
Number of moles of carbonic acid = 1.25 mol
Number of molecules of CO₂ produced = ?
Solution:
Chemical equation:
H₂CO₃ → CO₂ + H₂O
Now we will compare the number of moles of carbonic acid with CO₂ from balanced chemical equation.
H₂CO₃ : CO₂
1 : 1
1.25 : 1.25
Number of molecules can be determine by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
Number of molecules:
1 mole = 6.022 × 10²³ molecules
1.25 mol × 6.022 × 10²³ molecules / 1 mol
7.53×10²³ molecules
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