Answers
Answer:
?=0.522
Explanation:
5.22*10^-3=?*10^-2
5.22*0.01=?*0.1
0.522=?
This is my first time answer question, thx!
Answer:
0.522
Explanation:
Related Questions
LAST ATTEMPT IM MARKING AS BRAINLIEST!! (What is this compound ? )
The reaction of ethyl acetate with sodium hydroxide, CH3COOC2H5(aq)+NaOH(aq)⇌CH3COONa(aq)+C2H5OH(aq) is first order in CH3COOC2H5 and first order in NaOH. If the concentration of CH3COOC2H5 was increased by half and the concentration of NaOH was quadrupled, by what factor would the reaction rate increase?
A student is heating a chemical in a beaker with a Bunsen burner.In a paragraph of at least 150 words, identify the safety equipment that should be used and the purpose of it for the given scenario.
Calculate the partial pressure of each gas and the total pressure if the temperature of the gas is 21 ∘C∘C. Express the pressures in atmospheres to three significant digits separated by commas.
Answers
Answers
Answer:
76.0 years
Explanation:
Step 1: Given data
- Half-life (t1/2): 12.0 y
- Initial concentration of DDT ([A]₀): 809 ppbm
- Final concentration of DDT ([A]): 10.0 ppbm
- Time elapsed (t): ?
Step 2: Calculate the rate constant (k)
We will use the following expression.
k = ln 2/ t1/2 = ln 2 / 12.0 y = 0.0578 y⁻¹
Step 3: Calculate the time elapsed
For a first-reaction order, we will use the following equation.
ln [A]/[A]₀ = -k × t
t = ln [A]/[A]₀ / (-k)
t = (ln 10.0 ppbm/809 ppbm) / (-0.0578 y⁻¹)
t = 76.0 y
Answers
Answer:
The answer is 2.0 g/cm³
Explanation:
The density of a substance can be found by using the formula
From the question
mass = 4 g
volume = 2 cm³
We have
We have the final answer as
2.0 g/cm³
Hope this helps you
Answers
Answer:
2.11 molecules of CO₂
Explanation:
Given data:
Mass of CO₂ = 15.2 g
Molecules of CO₂ = ?
Solution:
Number of moles of CO₂:
Number of moles = mass/molar mass
Number of moles = 15.2 g/ 44 g/mol
Number of moles = 0.35 mol
Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ molecules
0.35 mol × 6.022 × 10²³ molecules / 1 mol
2.11 molecules of CO₂
Answers
When Americium (Am-241) undergoes alpha decay(He-4) it forms neptunium (Np-237) based on the following pathway:
²⁴¹Am₉₅ → ²³⁷Np₉₃ + ⁴He₂
The energy released in given as:
ΔE = Δmc²
where Δm = mass of products - mass of reactants
= [m(Np-237) + m(He-4)] - [m(Am-241)]
= 237.0482+4.0015-241.0568 = -0.0073 g/mol = -7.3 * 10⁻⁶ kg/mol
ΔE = -7.3*10⁻⁶ kg/mol * (3*10⁸ m/s)² = -5.84*10¹¹ J/mol
(c) Why might the suggestion for part (b) be of benefit to middle-distance runners?
Answers
Answer:
a) [HCO₃⁻] = 10,2 mM.
b) Sodium bicarbonate.
c) Yes.
Explanation:
a) The equilibrium of this reaction is:
CO₂ + H₂O ⇄ HCO₃⁻ + H⁺
Using Henderson-Hasselbalch equation:
pH = pka + log₁₀
Replacing:
7,03 = 6,1 + log₁₀
Thus, [HCO₃⁻] = 10,2 mM
b) A possible treatment of metabolic acidosis is with sodium bicarbonate. By Le Chateleir's principle the increasing of HCO₃⁻ will shift the equilibrium to the left decreasing thus, H⁺ concentration.
c) The shifting of the equilibrium to the left will increase CO₂ concentration producing in the body the need to increase breathing, increasing, thus, concentration of O₂ improving cardiac function in exercise.