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
forsale [732]
2 years ago
5

How many grams of calcium are made up by 2.68 x 1023 atoms?

Chemistry
1 answer:
raketka [301]2 years ago
5 0

Answer:

Mass = 17.8 g

Explanation:

Given data:

Number of atoms of Ca = 2.68 × 10²³

Mass in gram = ?

Solution:

Avogadro number:

The given problem will solve by using 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 atoms

2.68 × 10²³ atoms × 1 mole  /6.022 × 10²³ atoms

0.445 mol

Mass in gram;

Mass = number of moles ×  molar mass

Mass = 0.445 mol  ×  40 g/mol

Mass = 17.8 g

You might be interested in
Please help I will reward brainly !!
Reil [10]
What happens to the water in the clouds is that he cloud gets heavy and let’s the rainfall out, aka rain
8 0
3 years ago
Which statement best explains how electrons form a covalent bond in a molecule?
yKpoI14uk [10]

Answer:

covalent bond, also called a molecular bond, is a chemical bond that involves the sharing of electron pairs between atoms

the sharing of electrons allows each atom to attain the equivalent of a full outer shell, corresponding to a stable electronic configuration.

Explanation:

5 0
3 years ago
Read 2 more answers
Draw the structure of the product of each step in the following three-step synthesis. Show the formal charges, if applicable. As
Dvinal [7]

Answer:

Second step: 4-bromo-1-methyl-2-nitrobenzene.

Third step: 1.5-dibromo-2-methyl-3-nitrobenzene.

Explanation:

To solve this exercise I will use the concepts of electrophilic substitution. In these reactions, a functional group is displaced by an electrophile. In the attached image are the two main products.

5 0
3 years ago
Please help! <br> Fe2O3 + C → CO + Fe
Sunny_sXe [5.5K]
Fe2O3 + 3C → 2Fe + 3CO :)
3 0
1 year ago
At a certain temperature this reaction follows first-order kinetics with a rate constant of 2.01 s^−1
ddd [48]

Answer:

0.80 seconds (2 significant figures)

Explanation:

The equation of the reaction is given as;

CICH2CH2Cl (g) --> CH2CHCI (g) + HCl(g)

Rate constant (k) = 2.01 s^-1

From the units of the rate constant, this is a first order reaction.

Initial Concentration = 1.34 M

t = ?

Final concentration = 20% of 1.34 = 0.268 M

The integrated rate law for a first order reaction is given as;

ln[A] = ln[A]o - kt

ln(0.268) = ln(1.34) - 2.01(t)

-2.01(t) = - 1.6094

t = 0.8007 ≈ 0.80 seconds (2 significant figures)

6 0
2 years ago
Other questions:
  • When most fuels burn, water and carbon dioxide are the two main products. Why can´t you say that water and carbon dioxide are pr
    15·2 answers
  • A cube of an unknown metal is 1.25 inches on each side and has a mass of 128.3741 g. What is its' density?
    15·1 answer
  • Shiloh wanted to observe the changes that occurred during an exothermic reaction. He monitored the changes and placed them in a
    12·1 answer
  • The ion p3− has _____ protons and _____ electrons. enter your answers as integers separated by a comma.'
    11·1 answer
  • For metalloids on the periodic table, how do the group number and the period number relate?
    12·2 answers
  • Separating Mixtures Checkpoint ( giving brainly )
    8·2 answers
  • 4. When 1.00 L of 1.00 M Ba(NO3)2 solution at 25.0˚C is mixed with 1.00 L of 1.00 M Na2SO4 solution at 25.0˚C in a calorimeter,
    7·1 answer
  • Does entropy increase or decrease in the following processes?
    10·1 answer
  • The diagram below shows a longitudinal wave at one instant in its motion. Each oval represents a particle acted on by the energy
    6·2 answers
  • Can someone help me pls I don’t have time Time is almost ran out pls help
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!