Decomposition of potassium chlorate (KClO3) produces potassium chloride (KCl) and pure oxygen (O2). The balanced equation for the reaction is as follows.mc017-1.jpg
What volume of oxygen gas is released at STP if 10.0 g of potassium chlorate is decomposed? (The molar mass of KClO3 is 122.55 g/mol.)
0.914 L
1.83 L
2.74 L
3.66 L
Answers
1. The balanced reaction would be:
2KClO3 --> 2KCl + 3O2
We are given the amount of potassium chlorate for the reaction. This will be the starting point of our calculation.
10.0 g KClO3 ( 1 mol KClO3 / 122.55 g KClO3) (3 mol O2 / 2 mol KClO3) = 0.1224 mol O2
V = nRT/P =0.1224 mol O2 x 273 K x 0.08206 atm L/mol K / 1 atm
V=2.74 L
Answer:
third option 2.74L
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A substance that cannot be broken down into other substances by ordinary chemical procedures is a(n) __________ a) element b) compound c) isotope d) proton e) molecule
freezing water
melting ice
deposition of CO2 (changing from a gas to solid)
Answers
Among the choices given, the best answer is the third option. Melting ice shows an increase in entropy. Entropy is the degree of disorderliness in a system. Among the phases, solid has the most ordered structure which means it has the least entropy. The ice melting shows a phase change from solid to liquid. Liquid molecules are more disorganized than the solid thus there is an increase in entropy.
Answer: melting ice
Explanation:
Entropy is the measure of randomness or disorder of a system. If a system moves from an ordered arrangement to a disordered arrangement, the entropy is said to decrease and vice versa.
1. condensation of water : Condensation process is a process where gaseous state changes to liquid state., thus decreasing randomness and decreasing entropy.
2. Freezing water : Freezing process is a process where liquid state changes to solid state, thus decreasing randomness and decreasing entropy.
3. melting ice: Fusion process is a process where solid state changes to liquid state, thus increasing randomness and increasing entropy.
4. deposition of : deposition process where gaseous state changes to solid state by escaping liquid state, thus decreasing randomness and decreasing entropy.
B) Mg with 14 neutrons
C) Fe with 26 neutrons
D) Ti with 26 neutrons
Answers
The correct answer is option B: Mg with 14 neutrons
The mass spectrum shows the charge to mass ratio of atoms. I can be used to sort the isotopes of an element.
Isotopy is a phenomenon in which atoms of the same element have the same atomic number but different mass numbers.
The mass spectrum of atoms separates atoms on the basis of charge to mass ratio of the isotopes.
The isotopes of magnesium are; 24Mg atom which has 12 neutrons 25Mg which has 13 neutrons, and 26Mg which has 14 neutrons.
Hence, the peak at 26amu represents 26Mg which has 14 neutrons.
Answer:
The answer is B
Answers
Answer:
Explanation:
C7H14 has 3 isomers. Cycloheptane, methylcyclohexane and heptene all share the same formula.
Final answer:
The empirical formula of C7H14 is C7H14.
Explanation:
The empirical formula of C7H14 is C7H14. An empirical formula represents the simplest ratio of elements in a compound. In this case, there are 7 carbon (C) atoms and 14 hydrogen (H) atoms. The ratio between the two elements is 1:2, so the empirical formula is C7H14.
Learn more about Empirical formula of C7H14 here:
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Answers
Answers
also both are colourless and dry gases....
b. protons in the nucleus
c. valence electrons
d. innermost electrons
Answers
hope this helps
Answer: C. valence electrons
Explanation: Study Island