Find the pH of the following solution. 1.2 L of a solution containing 5.0x10^-4 grams of hydrobromic acid.

Answers

Answer 1

Answer: The HBr is a strong acid, that is, it is fully consumed in the reaction

molar mass HBr = 80.91 g/mol

number of moles = 5.0 x 10⁻⁴ / 80.91 = 6.17 x 10⁻⁶ moles

molarity = 6.17 x 10⁻⁶ / 1.2 = 5.14 x 10⁻⁶ M

HBr ------------------- H₃O⁺ +   Br ⁻
↓   ↓   ↓
  5.14 x 10⁻⁶ 0   0
- 5.14 x 10⁻⁶   5.14 x 10⁻⁶   5.14 x 10⁻⁶
_____________________________________
0   5.14 x 10⁻⁶ M   5.14 x 10⁻⁶ M

PH = - log [ H₃O⁺ ]

PH = - log [ 5.14 x 10⁻⁶ ]

PH = 5.82

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A second-order reaction starts with an initial concentration of 0.020 M of the reactant. If the rate constant is 1.0x10-3 M-1s-1, what is the time required for the concentration of the reactant to reach 0.010 M?
Given the balanced equation:4Fe(s) + 3O2(g) ==>2Fe2O3(s) + 1640 kJWhich phrase best describes this reaction?(1) endothermic with DH = +1640 kJ(2) endothermic with DH = -1640 kJ(3) exothermic with DH = +1640 kJ(4) exothermic with DH = -1640 kJ
Which balanced equation represents a chemical change?(1) H2O(l) + energy → H2O(g)(2) 2H2O(l) + energy → 2H2(g) + O2(g)(3) H2O(l) → H2O(s) + energy(4) H2O(g) → H2O(l) + energy
I will give brailiest to whoever needs it!
Nonmetals make up the largest grouping of elements on the periodic table. answer True or False

According to astronomers , the age of the universe is estimated to be

Answers

The age of the universe is approximately 13.8 billion years old. The universe is constantly expanding. A universe with a low density of matter is older than a matter – dmominated one. To determine the density and composition of the universe, scientists rely on missions such as NASA’s Wilkinson Microwave Anisotropy Probe spacecraft. They measure the thermal radiation left from Big Bang.

What is the total number of carbon atoms in a molecule of ethanoic acid?(1) 1 (3) 3(2) 2 (4) 4

Answers

There are 2 carbon atoms in ethanoic acid. Other name of such substance is acetic acid. It is a colorless liquid carboxylic acid with the chemical formula CH3COOH. It has antibacterial and antifungal properties.

What is the charge of the nucleus in an atom of oxygen-17?(1) 0 (3) +8
(2) –2 (4) +17

Answers

The charge of the nucleus in an atom of oxygen is +8. The correct option is 3.

What are the charges on the elements?

The charge is negative or positive or neutral charges present on the substance or molecule. The charges are produced by the gaining or losing of electrons.

The charges tell the tendency of the atom or molecule of gaining or losing of the atom.

Thus, the correct option is 3, +8.

Learn more about charges

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+ 8

the oxygen has 8 protons and 8 neutrons in your nucleus

hope this helps!

How many calories are absorbed by a sample water with a mass of 500 grams as it changes from 50 degrees C to 65 degrees C?

Answers

H = mCpT

H = (500 grams water)( 4.18 J/ g - degrees C) (65 - 50)

H =31,350 J

since 1 cal = 4184 joules

31,350 Joules (1 calorie/ 4184 joules) = 7.49 calories

ICl has a higher boiling point than Br2. What is the best explanation for this?a.)Br2 experiences dipole0dipole interactions.
b.)ICl experiences dipole0dipole interactions.
c.)Br2 forms hydrogen bonds.
d.)ICl experiences induced dipole0induced dipole interactions.

Answers

The best answer is B. ICl experiences induced dipole-induced dipole interactions. Both iodine and chlorine belongs to the same group of the periodic table. Electronegativity decreases as you go down a group therefore Cl will have a greater attraction with the bond it forms with another atom. Dipole-dipole interactions form between I and Cl. For the Br2 molecule, no dipole occurs because they are two identical atoms. Therefore we will be expecting ICl will have a higher boiling point due to higher binding energy it forms.

Which term describes this reaction? CH3Br(aq) + OH-(aq) -> CH3OH(aq) + Br-(aq) A. addition B. condensation C. elimination D. substitution

Answers

Answer is: D. substitution.

Substitution reaction or single displacement reaction is a chemical reaction in which one functional group in a chemical compound is replaced by another functional group.

Balanced chemical reaction: CH₃Br(aq) + OH⁻(aq) → CH₃OH(aq) + Br⁻(aq).

In this balanced chemical reaction hydroxy group OH⁻ replaced one atom of bromine (Br⁻) in methyl bromide (CH₃Br).

Answer : The correct option is, (D) Substitution reaction.

Explanation :

Addition reaction : It is a type of reaction in which a molecule combined with the another molecule to give a new larger molecule.

The general representation of this reaction is,

$A+B\rightarrow C$

Condensation reaction : It is a type of reaction in which two molecules combine to form a larger molecule and also producing a smaller molecule such as water.

$R_1-OH+H-OOCR_2\rightarrow R_1-O-COR_2+H_2O$