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
Simora [160]
3 years ago
11

Naturally occurring europium (Eu) consists of two isotopes was a mass of 151 and 153 . Europium-151 has an abundance of 48.03% a

nd Europium-153 has and abundance of 51.97%. What is the atomic mass of europium?
Chemistry
2 answers:
Minchanka [31]3 years ago
6 0

Answer:

151.94 u

Explanation:

The atomic mass of Eu is the <em>weighted average</em> of the atomic masses of its isotopes.

We multiply the atomic mass of each isotope by a number representing its relative importance (i.e., its <em>percent abundance</em>).

The atomic masses of Eu-151 and Eu-153 are 150.92 u and 152.92 u, respectively.

Set up a table for easy calculation.

0.4803 × 150.92 u =  72.472 u

0.5197 × 152.92 u  = <u> 79.473 u </u>

                 TOTAL = 151.94  u

Lisa [10]3 years ago
4 0

Answer:

Europium-151

Explanation:

You might be interested in
Why are unbalanced equations NOT useful in<br> chemistry?
Nimfa-mama [501]

Answer:

If the numbers of each type of atom are different on the two sides of a chemical equationExplanation:

4 0
2 years ago
How many significant figures<br> are in this number?<br> 43.55
leva [86]

Answer:

4 significant figures

Explanation:

Significant figures are the units/digits within a number that make the number more accurate and precise.

All digits (except for 0) are always significant. Therefore, all the digits in 43.55 are significant. Since there are 4 digits in the given number, there are 4 significant figures.

7 0
1 year ago
FIRST TO ANSWER CORRECTLY GETS BRAINELSIT! pls asap :)
zmey [24]
The protons! Is it the answer
4 0
3 years ago
Read 2 more answers
Calculate the number of calories needed to increase the temperature of 50.0 g of copper metal from 21.0 degrees C to 75.0 degree
KonstantinChe [14]
<h3>Answer:</h3>

1031.4 Calories.

<h3>Explanation:</h3>

We are given;

Mass of the copper metal = 50.0 g

Initial temperature = 21.0 °C

Final temperature, = 75°C

Change in temperature = 54°C

Specific heat capacity of copper = 0.382 Cal/g°C

We are required to calculate the amount of heat in calories required to raise the temperature of the copper metal;

Quantity of heat is given by the formula,

Q = Mass × specific heat capacity × change in temperature

   = 50.0 g × 0.382 Cal/g°C × 54 °C

   = 1031.4 Calories

Thus, the amount of heat energy required is 1031.4 Calories.

4 0
3 years ago
Identify the element using the Bohr model below.​
Maurinko [17]
Nitrogen I believe . I need 20 characters.
3 0
2 years ago
Other questions:
  • What is the number of protons that the element
    11·1 answer
  • How much 0.02 m kmno4 solution should be needed if the solutions tested have a composition of 3% h2o2 by mass?
    9·1 answer
  • A 200.0mL flask of unknown gas was placed in a hot water bath. The temperature of the bath was found to be 99 degrees C. The pre
    5·1 answer
  • 2 Points
    15·2 answers
  • 3. Give two examples of an ionic compound.
    7·1 answer
  • HELP ASAP
    14·1 answer
  • The mass of an object is measured to be 55.6 g. Its volume is measured to be 48.5 mL.
    15·1 answer
  • True or False:
    6·1 answer
  • G) The set of quantum numbers for the 6th electron in fluorine atom. ​
    13·1 answer
  • 1) 50.0 mL of water is measured out in a graduated cylinder. A rock with the mass of
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!