Answer:
-3.19x10³ J
Explanation:
Since the surroundings absorbed 3.19 × 10³ J (or 3190 J) of heat, the system, or the dissolution reaction, must have lost the same amount of heat. The heat for the system, then, is -3.19 × 10³ J (or -3190 J). We know this is true because of the first law of thermodynamics, "heat is a form of energy, and thermodynamic processes are therefore subject to the principle of conservation of energy".
Answer:
option b is correct option = (6.76×10¹⁴ Hz)
Explanation:
Given data:
Wavelength of photon = 4.42×10⁻⁷ m
Speed of light = 2.99×10⁸ m/s
Frequency of radiation = ?
Solution:
Formula:
Speed of wave = frequency × wavelength
Now we will rearrange this formula.
frequency = Speed of wave / wavelength
f = c/ λ
f = 2.99×10⁸ m/s / 4.42×10⁻⁷ m
f = 0.676×10¹⁵ Hz (s⁻¹ = Hz)
f = 6.76×10¹⁴ Hz
Thus option b is correct option.
Answer:
0.72 m3
Explanation:
Primero debes calcular el número de litros que vas a tener en total, para esto conviertes 8 horas a minutos, que son 480 minutos, y lo multiplicas por el flujo de 1.5 litros por minutos, por lo que obtendrás 720 litros. Sabiendo que 1000 litros son 1 m3, podemos calcular que 720 litros son 0.72 m3.
Answer:
Distillation
Explanation:
The method of distillation can be used to separate the two liquids, if their boiling point is known. The liquid with lower boiling point will be evaporated and its vapours will be captured, while the liquid with higher boiling point will remail in the container in the liquid state.
Answer:
- <u>Find out the concentraion of the acetic acid, calculate the number of moles, which is equal to the number of moles of baking soda, and then multiply by the molar mass of baking soda to convert to mass in grams.</u>
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Explanation:
You need the concentration of the <em>acetic acid.</em>
With the concentration you can find the number of moles of acid in the given 100mL of acetic acid solution.
- # of moles = molar concentration × number of liters of solution
By stoichiometry of the reaction, you determine the number of moles of <em>baking soda</em>:
CH₃COOH(aq) + NaHCO₃(aq) → CH₃COONa(aq) + CO₂(g) + H₂O(aq)
↑ ↑ ↑
<em>acetic acid baking soda gas</em>
From that balanced molecular equation, you find that 1 mole of acetic acid react with 1 mole of baking soda.
Then, using the molar mass of bakind soda, you convert the number of moles into mass in grams:
- mass in grams = number of moles × molar mass.
Then, adding that mass of baking soda, may be a little excess to be sure, all the acetic acid would be consumed getting the <em>largest amount of gas possible.</em>