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
mash [69]
3 years ago
7

1, 2 and 3 ........

Chemistry
1 answer:
Orlov [11]3 years ago
8 0
2.) Average atomic mass =Σ (abundance x molar mass) /100 = (12.64 x 302.04 + 18.23 x 304.12 + 69.13 x 305.03) /100 =304.486 u(Dalton) . This is avg atomic mass.

You might be interested in
A sample of gas occupies a volume of 10.5 L when the pressure is 14.3 psi. Use Boyle’s Law to calculate the pressure (psi) when
Nutka1998 [239]

Answer: 17.6psi

Explanation:

V1 = 10.5 L

P1 = 14.3 psi

V2 = 8.55L

P2 =?

P1V1 = P2V2

14.3 x 10.5 = P2 x 8.55

P2 = (14.3 x 10.5) / 8.55

P2 = 17.6psi

5 0
3 years ago
Read 2 more answers
What is an allotrope?
kaheart [24]
Opp that that person has to correct answer
6 0
3 years ago
The energy produced by the snack in an experiment is calculated to be 41,800 J/g. What is the energy of the snack in Calories/
Goryan [66]

The energy of the snack in calories per gram is 9983.3 Calories/gram.

<h3>What is the energy of a snack?</h3>

The energy that is contained in a snack is obtained from a calorimeter when the snack is burnt in a calorimeter. The mass of the snack that is burnt is measured in terms of energy output of the calorimeter.

If  1 calorie = 4.18J

x calorie = 41,800 J

x = 41,800 J * 1 calorie/4.18J

x = 9983.3 Calories/gram

Learn ore about energy in food:brainly.com/question/9602807

#SPJ1

5 0
2 years ago
Balance the equ. representing the reaction between iron
denis-greek [22]

Answer:

Fe₂O₃ + 3 CO → 2 Fe + 3 CO₂

Explanation:

There are many ways to balance a chemical equation. In this case, I will show you the algebraic method:

The first step is assign a letter to each compound:

a Fe₂O₃ + b CO → c Fe + d CO₂

Then, you must write the balance equations for each atom, thus:

<em>Fe: 2a = c</em>

<em>C: b = d</em>

<em>O: 3a + b = 2d</em>

The last step is assign a value to a letter. I, for example, will say that <em>a is 1, </em>and then find the values for the others letters, thus:

<em>Fe: 2a = c </em>if <em>a=1; c=2</em>

<em>O: 3a + b = 2d </em>if <em>a=1 → 3+b = 2d</em>

As b = d → <em>3+d = 2d; 3 = 2d - d; </em>3=d and 3=b

Thus, the balanced equation is:

Fe₂O₃ + 3 CO → 2 Fe + 3 CO₂

I hope it helps!

7 0
3 years ago
What % of the ideal soil is air?​
alina1380 [7]

Answer:

In soil air as in the atmosphere, nitrogen gas (dinitrogen) comprises about 78%. In the atmosphere, oxygen comprises about 21% and carbon dioxide comprises about 0.36%. However, in the soil air, oxygen usually is replaced by carbon dioxide, so both range from about 0.4% to 21%.

Explanation:

4 0
3 years ago
Other questions:
  • Most important factor in determining an element's place in the periodic table
    12·1 answer
  • How do you write electron configurations in 2 steps?​
    14·1 answer
  • What is 4.07 cm x 2.3cm, rounded to the correct number of significant figures
    9·1 answer
  • After a covalent bond has stabilized an atom, the atom will have
    7·2 answers
  • Which of the following can be observed only in a microscopic view
    13·2 answers
  • Give two reasons why mixing and heating sulphur powder and iron filings on a watch glass is chemical change
    9·1 answer
  • O<br> O<br> O<br> A. Molecule B. Compound<br> C. Both
    8·1 answer
  • From where do the placenta and umbilical cord develop?
    15·2 answers
  • What is your streak and what fact is it?
    9·2 answers
  • Metallic bonding is...
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!