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
posledela
3 years ago
5

How many moles are in 7.2x10^15 atoms of Pb?​

Chemistry
1 answer:
fiasKO [112]3 years ago
6 0
<h3>Answer:</h3>

1.2 × 10⁻⁸ mol Pb

<h3>General Formulas and Concepts:</h3>

<u>Math</u>

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right<u> </u>

<u>Chemistry</u>

<u>Atomic Structure</u>

  • Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

<u>Stoichiometry</u>

  • Using Dimensional Analysis
<h3>Explanation:</h3>

<u>Step 1: Define</u>

[Given] 7.2 × 10¹⁵ atoms Pb

<u>Step 2: Identify Conversions</u>

Avogadro's Number

<u>Step 3: Convert</u>

  1. [DA] Set up:                                                                                                     \displaystyle 7.2 \cdot 10^{15} \ atoms \ Pb(\frac{1 \ mol \ Pb}{6.022 \cdot 10^{23} \ atoms \ Pb})
  2. [DA] Multiply/Divide [Cancel out units]:                                                            \displaystyle 1.19562 \cdot 10^{-8} \ mol \ Pb

<u>Step 4: Check</u>

<em>Follow sig fig rules and round. We are given 2 sig figs.</em>

1.19562 × 10⁻⁸ mol Pb ≈ 1.2 × 10⁻⁸ mol Pb

You might be interested in
When the volume of a gas is changed from 524 cm^3 to ____ cm^3, the temperature will change from 491 K to 297 K .
SpyIntel [72]
V1/T1=V2/T2
524 cm^3/491 K =V2/297K

V2=(524 cm^3*297K)/491 K= 317K
5 0
3 years ago
Read 2 more answers
Hot coffee in a mug cools over time and mug warms up. Which describes the energy In this system
GenaCL600 [577]

Answer:

The average kinetic energy of the particles in the mug decreases. The average kinetic energy of the particles in the coffee increases. Thermal energy from the mug is transferred to the coffee. Thermal energy from the coffee is transferred to the mug.

8 0
3 years ago
Read 2 more answers
Choose the element that is more reactive: oxygen or argon.
Mazyrski [523]
I choose oxygen because
7 0
3 years ago
Determine the volume of fluid in the graduated cylinder shown.
alexgriva [62]

Answer:

47.3 ml

Explanation:

The graduated cylinder is shown in the image attached.

Now we have to take a good look at the cylinder, the lines between 45 and 50 are 46, 47, 48 and 49. Even though the points in between two lines weren't graduated but we can intelligently guess the correct volume by observing the upper meniscus of the liquid. Hence the answer.

8 0
3 years ago
Read 2 more answers
What is the concentration of the unknown h3po4 solution? the neutralization reaction ish3po4(aq)+3naoh(aq)→3h2o(l)+na3po4(aq) -g
hjlf
First, we need to get moles of NaOH:

when moles NaOH = volume * molarity 

                                  = 0.02573L * 0.11 M

                                 = 0.0028 moles 

from the reaction equation:

H3PO4(aq) + 3NaOH → 3 H2O(l) + Na3PO4(aq)

we can see that when 1 mol H3PO4 reacts with→ 3 mol NaOH

 ∴ X mol H3PO4 reacts with → 0.0028 moles NaOH

∴ moles H3PO4 = 0.0028 mol / 3 = 9.4 x 10^-4 mol

now we can get the concentration of H3PO4:

∴[H3PO4] = moles H2PO4 / volume

               = 9.4 x 10^-4 / 0.034 L

               = 0.028 M
6 0
3 years ago
Read 2 more answers
Other questions:
  • What is difference between pie and cake
    11·1 answer
  • Which of the following correctly describes a mixture? (4 points) Group of answer choices The particles are chemically bonded tog
    15·1 answer
  • How do you work out the relative atomic mass?
    8·1 answer
  • What type of coloration do the stonefish and oscellated frog fish have
    15·1 answer
  • Which statements describe inorganic compounds?
    15·1 answer
  • I’m just checking my answer. Thanks!
    12·1 answer
  • Which of the following is released during cellular respiration? A.Carbon dioxide B.Glucose C.Mitochondria D.Oxygen
    15·2 answers
  • Titration of 20.0 mL 0.120 M HCHO2 with 0.0800 M NaOH. Find the pH: (a) before NaOH addition; (b) after addition of 15.0 mL NaOH
    14·1 answer
  • Identify the effects of electrical forces and the role electrical forces play in the formation of ionic bonds by completing the
    14·2 answers
  • What do the red arrows represent
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!