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
larisa86 [58]
2 years ago
6

How many atoms are present in a sample of Calcium (Ca) weighing 127.38g?

Chemistry
1 answer:
kari74 [83]2 years ago
3 0

Answer:

1.9139 × 10²⁴ atoms Ca

General Formulas and Concepts:

<u>Chemistry - Atomic Structure</u>

  • Reading a Periodic Table
  • Using Dimensional Analysis
  • Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

Explanation:

<u>Step 1: Define</u>

127.38 g Ca

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

Avogadro's Number

Molar Mass of Ca - 40.08 g/mol

<u>Step 3: Convert</u>

<u />127.38 \ g \ Ca(\frac{1 \ mol \ Ca}{40.08 \ g \ Ca} )(\frac{6.022 \cdot 10^{23} atoms \ Ca}{1 \ mol \ Ca} ) = 1.91388 × 10²⁴ atoms Ca

<u>Step 4: Check</u>

<em>We are given 5 sig figs. Follow sig fig rules and round.</em>

1.91388 × 10²⁴ atoms Ca ≈ 1.9139 × 10²⁴ atoms Ca

You might be interested in
How would an increase in carbon dioxide concentration in the atmosphere change the green house effect? A. Carbon dioxide would c
Elis [28]

Answer:

D

Explanation:

7 0
3 years ago
Whats a particle of electormagnetic radiation
Tpy6a [65]

Answer:

<em>Scientists have observed that electromagnetic radiation has a dual "personality." Besides acting like waves, it acts like a stream of particles (called "photons") that have no mass. The photons with the highest energy correspond to the shortest wavelengths.</em>

Explanation:

Hope It Help

5 0
3 years ago
PLEASE HELP THIS THE THE LAST TEST OF THE SEMESTER
Kazeer [188]

Answer:

Its not balanced

Explanation:

3 0
2 years ago
A change from one state of matter to another involves the transfer of
Alja [10]
A heat because heat is the transfer of energy.
5 0
3 years ago
Read 2 more answers
How to tell which element is oxidized in a reaction?
adoni [48]
If in a redox reaction oxidation state of elements decreases or looses electron(s), the element is said to be oxidized. Hope this helps you!
4 0
3 years ago
Other questions:
  • Which of the following describes the principle of conservation of change
    10·1 answer
  • What is the temperature of 0.47 mol of gas at a pressure of 1.5 atm and a volume of 10.5 l ?
    15·1 answer
  • Which best describes a compound?
    12·1 answer
  • Which is the larger atom kr Or As
    5·1 answer
  • Word equation for k(s)+H2O(l) yield KOH(aq) + H2(g)
    12·2 answers
  • A chemical test has determined the concentration of a solution of an unknown substance to be 2.41 M. a 100.0 mL volume of the so
    9·1 answer
  • 2. What types of organisms have cells with very large vacuoles?
    14·1 answer
  • How many grams are in 3.00 x 10^24 molecules of Zn(C2H3O2)2?​
    14·1 answer
  • Is the law of conservative mass observed in this equation CaCO3 + 2HCI --&gt;CaCI2 +H2O + CO2
    5·1 answer
  • SEP math! Each day, the average person's
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!