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
Sveta_85 [38]
3 years ago
12

Element 'x' has two stable isotopes:

Chemistry
1 answer:
zalisa [80]3 years ago
6 0

Answer:

216.5 amu

Explanation:

Step 1: Given data

  • Mass of isotope ²¹⁵X (m²¹⁵X): 215 amu
  • Abundance of isotope ²¹⁵X (ab²¹⁵X): 25%
  • Mass of isotope ²¹⁷X (m²¹⁷X): 217 amu
  • Abundance of isotope ²¹⁷X (ab²¹⁷X): 75%

Step 2: Calculate the average atomic mass for the element

When an element has 2 or more isotopes, we calculate the average atomic mass (am) using the following expression.

am = ∑ mi × abi / 100%

where,

mi: mass of each isotope

abi: abundance of each isotope

am = (m²¹⁵X × ab²¹⁵X + m²¹⁷X × ab²¹⁷X) / 100%

am = (215 amu × 25% + 217 amu × 75%) / 100% = 216.5 amu

You might be interested in
Lithium diisopropylamide [(CH3)2CH]2NLi, referred to as LDA, enjoys many uses as a strong base in synthetic organic chemistry. I
meriva

Answer:

Lithium diisopropylamide [(CH3)2CH]2NLi.

Explanation:

Lithium diisopropylamide (commonly abbreviated LDA) is a chemical compound with the molecular formula [(CH3)2CH]2NLi. It is used as a strong base and has been widely accepted due to its good solubility in non-polar organic solvents and non-nucleophilic nature. It is a colorless solid, but is usually generated and observed only in solution. It was first prepared by Hamell and Levine in 1950 along with several other hindered lithium diorganylamides to effect the deprotonation of esters at the α position without attack of the carbonyl group.

5 0
3 years ago
The specific heat capacity of lead is 0.13 J/g-K. How much heat (in J) is required to raise the temperature of 15 g of lead from
Alona [7]

Answer:

c. 29 J

Explanation:

Step 1: Given data

  • Specific heat capacity of Pb (c): 0.13 J/g.K (= 0.13 J/g.°C)
  • Mass of Pb (m): 15 g
  • Initial temperature: 22 °C
  • Final temperature: 37 °C

Step 2: Calculate the temperature change

ΔT = 37 °C - 22 °C = 15 °C

Step 3: Calculate the heat (Q) required to raise the temperature of the lead piece

We will use the following expression.

Q = c × m × ΔT

Q = 0.13 J/g.°C × 15 g × 15 °C = 29 J

6 0
3 years ago
a radioactive nuclide that is used for geological dating has an atomic number of 19 and mass 40. what is the symbol of this nucl
PIT_PIT [208]

The symbol of the radioactive nuclide, given the data is ⁴⁰₁₉K

<h3>Data obtained from the question</h3>
  • Atomic number = 19
  • Mass number = 40
  • Symbol of nuclide =?

<h3>How to determine the nuclide</h3>

From the question given above, the atomic number of the nuclide is 19.

Comparing the atomic number (i.e 19) of the nuclide with those in the periodic table, the nuclide is potassium with a symbol of K

<h3>How to determine the symbol of the nuclide</h3>
  • Atomic number (Z) = 19
  • Mass number (A) = 40
  • Name of nuclide = Potassium (K)
  • Symbol of nuclide =?

The symbol of a nuclide is given as ᴬ₂X

Where

  • A is the mass number
  • Z is the atomic number
  • X is the symbol of the element

Thus,

ᴬ₂X => ⁴⁰₁₉K

Therefore, the symbol of the nuclide is ⁴⁰₁₉K

Learn more about composition of atoms:

brainly.com/question/886387

#SPJ1

3 0
2 years ago
Which of the following is true for the actual yield of a reaction?
ludmilkaskok [199]

Answer:

It is always less than the theoretical yield

Explanation:

For many chemical reactions, the actual yield is usually less than the theoretical yield. This is due to possible loss in the process or inefficiency of the chemical reaction.

4 0
3 years ago
Read 2 more answers
hey! i know this isnt chemistry but uh I dont think anyone gonna answer me in psychics and its due in 30 minutes... marking brai
coldgirl [10]

Answer:

A. Adding another bulb will make the two of them light a little less brighter since the electrical flow is divided into two making them work.

B. There is a possibility that the flow of electricity maybe little due to the thickness of the wire. There could also be a rise in the temperature of the cell and the bulb.

C. The Bulb will shine brighter because of the extra power or electricity provided! Also, if the voltage is too much, expect the bulb to burn out or sadly, explode.

BTW GOODLUCK!!

watch 9-1-1 on Fox!

4 0
3 years ago
Read 2 more answers
Other questions:
  • Which of the phases below are NOT able to be compressed
    5·1 answer
  • PLEASE HELP FAST!!!!!!!!!!!!!<br><br> Define erosion.
    12·2 answers
  • Why is rutherfords experiment called the gold foil experiment ?
    14·1 answer
  • 1.) Which kind of bond would be expected from the above below? (1st image)
    12·2 answers
  • Ammonia forms when hydrogen gas reacts with nitrogen gas according to the equation below. If equal moles of nitrogen and hydroge
    8·2 answers
  • What happens to the rate of the reaction when the concentration is increased? Explain the effect of concentration on reaction ra
    6·2 answers
  • Which statement justifies that phosphine (PH3) is a polar molecule?
    7·1 answer
  • A 367.8 g sample of potassium chlorate was decomposed according to the following equation:
    12·1 answer
  • Lithium oxide+sulphuric acid​
    15·2 answers
  • Which of the following is not a characteristic of a metal?
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!