What is the mass of NH4Cl that must dissolve in 200. grams of water at 50.°C to make a saturated solution?(1) 26 g (3) 84 g
(2) 42 g (4) 104 g
Answers
Answer: It's 104 g
Explanation: yes
50 g NH₄Cl----------------- 100 g (H₂O)
? mass NH₄Cl------------- 200 g (H₂O)
mass NH₄Cl = 200 . 50 / 100
mass
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A piece of sodium metal reacts completely with water as follows: 2Na(s) + 2H2O(l) ⟶ 2NaOH(aq) + H2(g) The hydrogen gas generated is collected over water at 25.0°C. The volume of the gas is 246 mL measured at 1.00 atm. Calculate the number of grams of sodium used in the reaction. (Vapor pressure of water at 25°C = 0.0313 atm.)
changes from 53.0 atm to 35.2
atm, the temperature changes
from
°C to 12.0°C.
Please help I will give brainliest
Answers
Answer:
To determine the relationship between pressure and temperature in this scenario, we can use the ideal gas law.
The ideal gas law states that PV = nRT, where P represents pressure, V represents volume, n represents the number of moles of gas, R is the ideal gas constant, and T represents temperature in Kelvin.
Since we only have the initial and final pressures and temperatures, we can compare them using the ideal gas law equation by setting up the following ratio:
(P₁T₁) / (P₂T₂) = (V₁n₁R) / (V₂n₂R)
Since the volume, number of moles, and gas constant remain constant, we can simplify the equation:
(P₁T₁) / (P₂T₂) = 1
Now, we can substitute the given values into the equation:
(53.0 atm * T₁) / (35.2 atm * 12.0°C) = 1
To solve for T₁, we need to convert 12.0°C to Kelvin by adding 273.15:
(53.0 atm * T₁) / (35.2 atm * (12.0 + 273.15) K) = 1
Simplifying the equation further:
(53.0 atm * T₁) / (35.2 atm * 285.15 K) = 1
Now, we can solve for T₁:
(53.0 atm * T₁) = (35.2 atm) * (285.15 K)
Dividing both sides of the equation by 53.0 atm:
T₁ = (35.2 atm * 285.15 K) / 53.0 atm
Calculating the numerical value:
T₁ ≈ 189.5 K
Therefore, when the pressure changes from 53.0 atm to 35.2 atm, the temperature changes from approximately 12.0°C to 189.5 K.
Answers
Answers
Answer is: A. test and determine the pH values of unknown solutions.
Acid-base indicators are usually weak acids or bases and they are chemical detectors for hydrogen or hydronium cations (pH or pOH values).
Example for acid-base indicator is phenolphthalein (molecular formula C₂₀H₁₄O₄). Phenolphthalein is colorless in acidic solutions and pink in basic solutions.
Another example is methyl orange. It is red colour in acidic solutions and yellow colour in basic solutions.
Answer: The correct answer is option A.
Explanation:
An indicator is a substance which changes color to show any chemical change happening in the reaction. It gives the visible sign of any change.
Hence, main role of indicators from the given options is to determine the pH values of unknown solutions.
pH is the scale which shows the acidity and basicity of the solutions. It is the negative logarithmic value of hydrogen ion concentration of the solution. More the hydrogen ion concentration, less will be the pH and more acidic will be the solution.
The scale ranges from 0 to 14.
The value ranging from 0 to 6.9 are acidic solutions.
The value ranging from 7.1 to 14 are basic solutions.
The value having pH = 7 is neutral solution.
Indicator used to determine the pH of the solution is pH-paper which is shown in the image.
Answers
The product of an alphadecay of 222/86 Rn is 218/84 Po (option B).
What is an alpha decay?
Alphadecay is a type of radioactive disintegration in which some unstable atomic nuclei dissipate excess energy by spontaneously ejecting an alpha particle.
An alphaparticle is a positively charged nucleus of a helium-4 atom emitted as a result of radioactivity. It has a formula of 4/2 He.
This suggests that when a 222/86 Rn undergoes alphadecay, the product will have mass and atomic number as follows:
- Mass no.: 222 - 4 = 218
- Atomic no.: 86 - 2 = 84
The element with atomic number 84 is Polonium (Po).
Therefore, option B is correct.
Learn more about alpha decay: brainly.com/question/35140893
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Since NH3 solution is a weak base, the option that neutralizes a base is an acid. So find an acid among your options, and here are some examples: HNO3, HCl, etc.