1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Colt1911 [192]
3 years ago
12

Number of moles of Cl2 molecules in a sample that contains 7.12×1025 molecules of Cl2.

Chemistry
1 answer:
Alik [6]3 years ago
4 0
120 moles in that sample. Take 7.12 x 10^25/ 6.02x10^23 to get that answer
You might be interested in
ook at sample problem 18.12 in the 8th ed Silberberg book. Write a balanced chemical equation (salt hydrolysis). So acetate ion
vfiekz [6]

Answer:

Here's what I get  

Explanation:

1. Write the chemical equation

CH₃COO⁻ + H₂O ⇌ CH₃COOH + OH⁻; Kₐ = 2 × 10⁻⁵

Let's rewrite the equation as

A⁻ + H₂O ⇌ HA + OH⁻

2. Calculate Kb

K_{\text{b}} = \dfrac{K_{\text{w}}}{K_{\text{a}}} = \dfrac{1.00 \times 10^{-14}}{2 \times 10^{-5}} = 5 \times 10^{-10}

3. Set up an ICE table

                      A⁻ + H₂O ⇌ HA + OH⁻

I/mol·L⁻¹:      0.35                 0       0

C/mol·L⁻¹:       -x                  +x      +x

E/mol·L⁻¹:    0.35-x               x        x

4. Solve for x

\dfrac{\text{[HA ][OH$^{-}$]}}{\text{[A$^{-}$]}} = \dfrac{x^{2}}{0.35-x} = 5 \times 10^{-10}

Check for negligibility,

\dfrac{\text{[HA]}}{K_{\text{b}}} = \dfrac{0.35}{5 \times 10^{-10}} = 7 \times 10^{8}> 400\\\\\therefore x \ll 0.35\\\\\dfrac{x^{2}}{0.35} = 5 \times 10^{-10}\\\\x^{2} = 0.35 \times 5 \times 10^{-10} = 1.8\times 10^{-10}\\\\x = \sqrt{1.8\times 10^{-10}} = \mathbf{1 \times 10^{-5}}

5. Calculate the pOH

[OH⁻] = 1 × 10⁻⁵ mol·L⁻¹

pOH = -log[OH⁻] = -log(1 × 10⁻⁵) = 4.88

6. Calculate the pH.

pH + pOH = 14.00

pH + 4.88 = 14.00

pH = 9.12

Note: The answer differs from that given by Silberberg because you used only one significant figure for the Kₐ of acetic acid.

3 0
3 years ago
A prescription medication requires 0.00255g per lb of body weight.
Pani-rosa [81]

The prescription in mg/Kg of body weight is 5.62 mg/kg.

<h3>How to convert to mg required per kg of body weight?</h3>

Drugs are chemicals that are taken into the body and they are able to help to correct anomalies in the bodies. Drugs are taken according to the kind of ailment that a person is suffering from.

The nature of the drug and the severity of thee ailment of the person determines the dose of the drug.

Now we know that;

1 g/pound =2204.6244 mg/kg

0.00255g/lb = 0.00255g/lb * 2204.6244 mg/kg/1 g/pound

= 5.62 mg/kg

Learn more about unit conversion:brainly.com/question/4736731

#SPJ1

Missing parts;

A prescription medication requires 0.00255 g per lb of body weight.  Convert this quantity to the number of mg required per kg of body weight.

5 0
2 years ago
Which substance is insoluble and floats in water? A) Ice shavings B) Wood shavings C) Salt crystals D) Sugar crystals
hjlf
Wood shavings will float
4 0
3 years ago
Help me with this please
Leya [2.2K]

Answer:

I think it's answer 3 and 2

7 0
3 years ago
Folding and faulting are two examples of slow changes by which plate tectonics can shape Earth’s surface. Which of the following
Blizzard [7]

Answer:

d

Explanation:

6 0
2 years ago
Read 2 more answers
Other questions:
  • The concentration of sugar in a soft drink is measured to be 10.5%. how many grams of sugar are in 125 g of the drink?
    7·1 answer
  • Which of the following is not a compound?
    15·1 answer
  • Explain the units and how to solve the following metric conversion then solve the metric conversion by filling in the blank 12KM
    6·1 answer
  • Explain how you can estimate the number of neutrons in the atoms of an element.
    13·2 answers
  • Fill in the coefficients that will balance the following reaction: a0Ca + a1CO2 + a2O2 → a3CaCO3
    9·1 answer
  • On a cool morning, Uyen’s breath can form a cloud when she breathes out. Which changes of state are most responsible for Uyen se
    7·2 answers
  • SOICHIOMETRY HOW MANY MOL OF NITROGEN DIOXIDE ARE REQUIRED TO PRODUCE 2.75 MOL NITRIC ACID? 3NO2+ H20→ 2HNO3+ NO
    14·1 answer
  • A 17.98-g piece of iron absorbs 2056.5 joules of heat energy, and its temperature changes from 25°C to 200°C. Calculate the spec
    6·1 answer
  • Pick a "for every" statement about copper and silver nitrate for this reaction.
    6·1 answer
  • When sulfate (SO42-) serves as the electron acceptor at the end of a respiratory electron transport chain, the product is?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!