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
Vika [28.1K]
3 years ago
12

Calculate the average atomic mass of unknown element X. You determine that isotope 127X makes up 80%, isotope 126X makes up 17%,

and isotope 128X makes up 3%.
A. 127.10 amu
B. 126.86 amu
C. 127.54 amu
D. 126.20 amu

Chemistry
1 answer:
Rasek [7]3 years ago
6 0

Answer:

Option B. 126.68 amu

Explanation:

The following data were obtained from the question:

Isotope A (¹²⁷X):

Mass of A = 127

Abundance (A%) = 80%

Isotope B (¹²⁶X):

Mass of B = 126

Abundance (B%) = 17%

Isotope C (¹²⁸X):

Mass of C = 128

Abundance (C%) = 3%

Average atomic mass of element X =.?

Th4 average atomic mass of X can be obtained as follow:

Average atomic mass = [(Mass of A × A%)/100] + [(Mass of B × B%)/100] + [(Mass of C × C%)/100]

= [(127 × 80)/100] + [(126 × 17)/100] + [(128 × 3)/100]

= 101.6 + 21.42 + 3.84

= 126.68 amu

Therefore, the average atomic mass of X is 126.68 amu

You might be interested in
SOMEONE PLEASE HELP ME THIS IS DUE TOMORROW!! I WILL MARK YOU AS A BRAINLIEST IF ANSWERED NOW!!
AnnZ [28]
K= [Ar] 4s^1

Pb= [Xe]  6s^2 5d^10 6p^2

Sc= [Ar] 4s^2 3d^1

Ra= [Rn] 7s^2

O= [He] 2s^2 2p^4

Ag= [Kr] 5s^2 4d^9

Ru= [Kr] 5s^1

Ce=  [Xe] 6s^2 5d^1 4f^1

I= [Kr] 5s^2 4d^10 5p^5

F= [He] 2s^2 2p^5



6 0
4 years ago
How does fabric softener affect the flammability of clothes?
Brrunno [24]
It makes your clothes smell great
6 0
4 years ago
Read 2 more answers
to save time you can approximate the initial volume of water to ±1 ml and the initial mass of the solid to ±1 g . for example, i
makkiz [27]

The correct answer for this question is

20.2 g silver placed in 21.6 mL of water and 12.0 g silver placed in 21.6 mL of water.

15.2 g copper placed in 21.6 mL of water and 50.0 g copper placed in 23.4 mL of water.

11.2 g gold placed in 21.6 mL of water and 14.9 g gold placed in 23.4 mL of water.

To know more about Density, click here:

brainly.com/question/6107689

#SPJ4

8 0
2 years ago
Examples of the skills used in science include _____ and _____.
ollegr [7]
In science you want to use observations and measurements. 
5 0
3 years ago
What is the name of the molecule below
Yuliya22 [10]

Explanation:

but.......you havent attached a picture?

3 0
3 years ago
Other questions:
  • Help! Giving brainliest!!!!
    6·1 answer
  • What is the correct description of lactic acid fermentation?
    14·2 answers
  • From the standpoint of entropy, consider the following processes: water boiling, mixing cola and root beer sodas, and assembling
    15·1 answer
  • Help? I don't know if it's right.
    14·1 answer
  • What is the formula for the aqueous salt produced when hydroiodic acid is neutralized by potassium hydroxide?
    12·1 answer
  • What property is shiny, silver colored, forms +1 and +2 ions, compound with sulfur is bright red
    10·1 answer
  • Which isotope has the greatest number of protons?
    6·1 answer
  • Identify the unit that is used for atomic masses
    15·1 answer
  • What is the general formula of an alkene?
    6·1 answer
  • light frequency 1.40x10^15 Hz strike a surface causing photoelectrons to leave with a KE of 1.05 eV what is the work function in
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!