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
IRISSAK [1]
2 years ago
8

mass number is the number of protons and neutrons in the nucleus of an isotope . how many protons in an oxygen-18 atom ?

Chemistry
1 answer:
Reika [66]2 years ago
6 0

Answer: Oxygen - 18 atom contains 8 protons.

Explanation:

The number of protons is the same as the atomic number. In isotopes, only the neutrons vary, but the protons always remain the same.

You might be interested in
A sample of diborane gas (B2H6), a substance that bursts into flame when exposed to air, has a pressure of 345 torr at a tempera
Hitman42 [59]

Answer:

The final volume is 3.07L

Explanation:

The general gas law will be used:

P1V1 /T1 = P2V2 /T2

V2 =P1 V1 T2 / P2 T1

Give the variables to the standard unit:

P1 = 345 torr = 345 /760 atm = 0.4539atm

T1 = -15°C = -15 + 273 = 258K

V1 = 3.48L

T2 = 36°C = 36+ 273 = 309K

P2 = 468 torr = 468 * 1/ 760 atm = 0.6158atm

V2 = ?

Equate the values into the gas equation, you have:

V2 = 0.4539 * 3.48 * 309 / 0.6158 * 258

V2 = 488.0877 /158.8764

V2 = 3.07

The final volume is 3.07L

8 0
3 years ago
How many moles are in 4.3 x 10 ^22 molecules of Na3PO4
Sever21 [200]

Answer:

0.071 moles of Na₃PO₄ .

Explanation:

Given data:

Number of molecules of Na₃PO₄ = 4.3× 10²² molecules

Number of moles = ?

Solution:

1 mole contain 6.022 × 10²³ molecules

4.3× 10²² molecules × 1 mol / 6.022 × 10²³ molecules

0.71× 10⁻¹ mol

0.071 mol

The number 6.022 × 10²³ is called 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"

3 0
3 years ago
What net force is required to cause a 12,000 kg airplane to accelerate at a rate of 5.2 m/s
galina1969 [7]
The answer is 624000N
6 0
2 years ago
Human blood has a pH between 7.35 and 7.45. Which of the following best describes human blood?
uysha [10]

Answer:

C. slightly basic

Explanation:

0-7 = acidic

7 = neutral

7-14 = basic

- Since the pH is just over 7, the answer would be slightly basic.

- Hope this helps! Please let me know if you need a further explanation.

6 0
3 years ago
15 grams of HCl should theoretically produce 0.42 grams of H2. The reaction actually produced 0.15 grams of H2. What is the perc
Helen [10]

Answer:

35.7%

Explanation:

The percent yield is calculated by the formula:

<em>[(actual yield) / (theoretical yield)] * 100</em>

In this case, the actual yield is 0.15 grams, and the theoretical yield is 0.42 grams. So, putting these values into the equation, we have:

\frac{0.15}{0.42} *100=0.357*100=35.7

Thus, the percent yield of H_2 is 35.7%.

Hope this helps!

8 0
3 years ago
Other questions:
  • Which of the following is an example of a homogeneous mixture?
    15·2 answers
  • What do helium (He), neon (Ne), and argon (Ar) have in common?
    11·2 answers
  • How does temperature affect the state of matter
    15·1 answer
  • Determine the number of moles in 4.50 g of H2O
    13·1 answer
  • What is the net ionic equation for the reaction that occurs when aqueous solutions of koh and zncl2 are mixed?
    7·1 answer
  • Which of the following elements has the highest first ionization energy: Na, Mg, S or Cl?
    12·1 answer
  • If a reaction generated 3.5 g of H2O how many moles of water were formed?
    9·1 answer
  • What can you say about an atom with a -2 ion of oxygen-17? WILL GIVE BRAINLIEST
    15·1 answer
  • . When a newspaper is left in direct sunlight for a few days, the paper begins to turn yellow. The yellow
    6·1 answer
  • The difference between Physical/Chemical properties and Physical/Chemical changes
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!