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
ahrayia [7]
3 years ago
9

An unknown element has two isotopes: one whose mass is 68.926 amu (60.00% abundance) and the other whose mass is 70.925 amu (40.

00% abundance). The average atomic mass of the element is equal to _____.
Chemistry
1 answer:
scZoUnD [109]3 years ago
7 0

Answer:

69.726 amu

Explanation:

From the question given above, the following data were obtained:

Isotope A:

Mass of A = 68.926 amu

Abundance of A (A%) = 60.00%

Isotope B:

Mass of B = 70.925 amu

Abundance of B (B%) = 40.00%

Average atomic mass =?

The average atomic mass of the element can be obtained as shown below:

Average atomic mass

= [(Mass of A × A%)/100] + [(Mass of B × B%)/100]

= [(68.926 × 60)/100] + [(70.925 × 40)/100]

= 41.3556 + 28.37

= 69.726 amu

Therefore, the average atomic mass of the element is 69.726 amu

You might be interested in
Convert 0.74Kcal/min to cal/sec
professor190 [17]
<span>0.74 Kcal/min x 1000 cal/60 s         


</span>
6 0
3 years ago
the scientific law of conservation of mass states that the total amount of mass in an isolated system remains constant. This mea
Verdich [7]
It describes how, when particles/mc/elements react, despite forming different substances the mass is neither created nor destroyed but only converted.
4 0
3 years ago
Read 2 more answers
The chemist discovers a more efficient catalyst that can produce ethyl butyrate with a 78.0% yield. How many grams would be prod
Vedmedyk [2.9K]

The grams that would be produced  from 7.70 g of butanoic acid and excess ethanol is 7.923grams

calculation

Step 1: write the chemical equation for the reaction

CH3CH2CH2COOH + CH3CH2OH →  CH3CH2CH2COOCH2CH3  +H2O

step 2: find the moles of butanoic acid

moles= mass/ molar mass

=  7.70 g/ 88 g/mol=0.0875 moles

Step 3:  use the mole ratio to determine the moles of ethyl butyrate

moles ratio of CH3CH2CH2COOH :CH3CH2CH2COOCH2CH3  is 1:1 therefore the moles of CH3CH2CH2COOCH2CH3 = 0.0875  x78/100=0.0683moles

step 4: find mass = moles x molar mass

 =  0.0683 moles  x116 g/mol=7.923grams

5 0
3 years ago
Read 2 more answers
Help please if its right i'll give brainiest
Mkey [24]
I believe it is spontaneous generation
5 0
3 years ago
Three players (A, B and C) shoot three arrows at a target
UkoKoshka [18]

Answer:

Player B

Explanation:

I just did it and I got it right :)

6 0
3 years ago
Other questions:
  • Based on the chart, determine the identity of a substance that increases in temperature by 11.4oC when 1250J of energy are added
    13·1 answer
  • Given the balanced equation:
    14·1 answer
  • If there is initially 1.334 m o2, how long will it take for the o2 concentration to reach 0.443 m?
    5·1 answer
  • Methane and hydrogen sulfide form when hydrogen reacts with carbon disulfide. Identify the excess reagent and calculate how much
    13·1 answer
  • where will you find maximum rate of evaporation - ocean, pond or an aquarium? Give reason to support your answer.
    6·2 answers
  • If I start with 5 grams of c3h8 what is my theoretical yield of water
    9·1 answer
  • How is the energy of an object affected after work is done on it?
    14·1 answer
  • Energy does not have to involve motion.<br> Question 8 options:<br> True<br> False
    8·1 answer
  • Which best describes the difference between Mitosis and Meiosis?
    9·1 answer
  • What is the scientific way of planting? Why is it important?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!