Which of the following gases will have the highest velocity at a given temperature?
2 answers:
Answer:
C. He
Explanation:
The velocity of a gas can be calculated by the equation:
Where <em>R</em> is the gas constant, <em>T</em> is the temperature, and <em>M</em> the molar mass of the gas.
At a given temperature, the velocity is inversely proportional to the square of the molar mass, so as low is the molar mass, as higher is the velocity. The molar masses are:
Ne = 10 g/mol
O₂ = 2*16 = 32 g/mol
He = 4 g/mol
Cl₂ = 2*35.5 = 71 g/mol
Then, <em>He</em> has the lower molar mass and the highest velocity.
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Answer: The reaction is exothermic
The value is negative.
Heat is a product.
Explanation:
Endothermic reactions are defined as the reactions in which energy of the product is greater than the energy of the reactants. The total energy is absorbed in the form of heat and for the reaction comes out to be positive.
Exothermic reactions are defined as the reactions in which energy of the product is lesser than the energy of the reactants. The total energy is released in the form of heat and for the reaction comes out to be negative.
The substances which are written on the left side of the arrow are reactants and the substances which are written on the right side of the arrow are products. Thus heat is a product.
Answer:
The molar concentration of Cu²⁺ in the initial solution is 6.964x10⁻⁴ M.
Explanation:
The first step to solving this problem is calculating the number of moles of Cu(NO₃)₂ added to the solution:
n = 1.375x10⁻⁵ mol
The second step is relating the number of moles to the signal. We know the the n calculated before is equivalent to a signal increase of 19.9 units (45.1-25.2):
1.375x10⁻⁵ mol _________ 19.9 units
x _________ 25.2 units
x = 1.741x10⁻⁵mol
Finally, we can calculate the Cu²⁺ concentration :
C = 1.741x10⁻⁵mol / 0.025 L
C = 6.964x10⁻⁴ M