Answer:
2.58
Explanation:
Each tablet has a mass of 470 mg. The mass of 2 tablets is 2 × 470 mg = 940 mg = 0.940 g
The molarity of acetylsalicylic acid (aa) is:
M = mass of aa / molar mass of aa × liters of solution
M = 0.940 g / 180.16 g/mol × 0.240 L
M = 0.0217 M
Acetylsalicylic acid is a weak acid, so we can find [H⁺] using the following expression.
[H⁺] = √(Ca × Ka)
where,
Ca: concentration of the acid
Ka: acid dissociation constant
[H⁺] = √(0.0217 × 3.24 × 10⁻⁴)
[H⁺] = 2.65 × 10⁻³ M
The pH is:
pH = -log [H⁺] = -log 2.65 × 10⁻³ = 2.58
Explanation:
According to newton's second law; the acceleration is directly proportional to the unbalanced force and inversely proportional to the mass,
A = f/m
Force = m x a,
So, the force increases with the mass and acceleration.
Answer:
152.4 g of O₂ are consumed.
Explanation:
We start from the combustion reaction:
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
We convert the mass of propane to moles:
41.9 g . 1mol /44g = 0.952 moles
Ratio is 1:5. 1 mol of propane consumes 5 moles of oxygen at propane combustion
Then, 0.952 moles may consume (0.952 . 5) /1 = 4.76 moles.
We convert moles to mass → 4.76 mol . 32g/mol = 152.4 g
Answer:
Salt does not conduct electricity because it is an insulator.
And the other is false
Your answer is B) the esophagus.
Your esophagus is located in your throat between your mouth and your stomach.
