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
Novosadov [1.4K]
3 years ago
11

An element has four naturally occurring isotopes with the masses and natural abundances given in the table below. Find the atomi

c mass of the element (express your answer to four significant figures and include the appropriate units).
Isotope Mass (amu) Abundance (%)
1 203.97304 1.390
2 205.97447 24.11
3 206.97590 22.09
4 207.97665 52.41
Identify the element, by spelling out its full name.
Chemistry
1 answer:
Anestetic [448]3 years ago
6 0

Answer:

Lead (Pb)

Explanation:

To find the atomic mass of the element, we need to take into consideration all the naturally occurring isotopes. We then find the atomic mass by multiplying the natural abundance of the isotopes by their mass for all of the isotopes and summing them together.

1. 1.390/100 * 203.97304 = 2.835225256

2. 24.11/100 * 205.97447 = 49.660444717

3. 22.09/100 * 206.97590 = 45.72097631

4. 52.41/100 * 207.97665 = 109.000562265

We then add all of these masses together:

109.000562265 + 45.72097631+ 49.660444717 + 2.835225256 = 207.217208548

To 4 sf = 207.2 amu

Element is Lead (Pb)

You might be interested in
How much heat energy in megajoules is neede to convert 7kilograms of ice at negative 9 degrees to water at 0 degrees celsius
den301095 [7]

Heat_1: Get the ice to 0 degrees

Convert 7 kg to grams

7 kg [1000 grams / 1 kg] = 7000 grams

Heat needed to get the the ice from - 9 to 0

deltat = 0 - -9 = 9 degrees

m = 7000 grams

c = 2.1 joules/gram

Heat_1 = m*c*deltat

Heat_1 = 7000 * 2.1 * 9

Heat_1 = 132,300 joules

Heat_2: Melt the ice.

There is no temperature change. The formula is 333 j/gram

Formula: H = mass * constant

H = 7000 g * 333 J / gram

H = 2331000 joules

Heat_3: Total amount of Joules needed.

2331000 + 132300 = 2 463 300 joules

Convert to Megajoules

2 463 300 joules * 1 megajoule / 1000000 = 2.63 megajoules.

8 0
3 years ago
Infer Xenon, a nonreactive gas used in strobe lights, is a poor conductor of heat and electricity. Would you expect xenon to be
lesantik [10]

Mark the lime poor conducter of heat and electricity.

  • Hence it's non metal

Yes why no ,Xenon is already has its secured place in modern periodic table.

  • It belongs to group 18,the Helium family and inert gas group having atomic no Z=54
4 0
2 years ago
An outdoor grill has a propane (C3H8) tank that holds 4.8 L of gas at a pressure of 5.5 atm. If all of the gas is transferred in
shtirl [24]

Answer: 0.176 atm

Explanation: Solution attached:

Use Boyle's Law to find the new pressure of the gas.

P1V1 = P2V2

Derive for P2

P2 = P1V1 / V2

= 5.5 atm ( 4.8 L ) / 150 L

= 0.176 atm

4 0
3 years ago
The heat exchange in chemical reactions is due to a change in:
Paha777 [63]

Answer:

B

Explanation:

This would be due to enthalpy. This is because that this where heat exchange happens in chemical reactions.

So, a positive enthalpy means that the reaction is endothermic (heat entering) and if enthalpy is negative this will be a exothermic (heat released)

Another example would be the use of atoms. This example if temperature is the factor, this means that at low temp there is less kinetic energy so low temperature. However, an increase in energy means that there is more kinetic energy in the atoms which means that more collisions occurring.

Hope this helps !!!!

Have a nice day :)

5 0
3 years ago
Scientists have changed the model of the atom as they have gathered new evidence. One of the atomic models is shown below. A pur
Julli [10]

Answer:

dude that doesnt maek sense

Explanation:

6 0
3 years ago
Other questions:
  • A crystallographer measures the horizontal spacing between molecules in a crystal. The spacing is 10.59 nm . What is the total w
    8·1 answer
  • Which statements describe friction? Select four options.
    12·2 answers
  • Can 1750 mL of water dissolve 4.6 moles of copper sulfate CuSO4
    11·1 answer
  • Why is it possible to safely drink a solution that contains a 50:50 mixture of equal concentrations of a strong acid and a stron
    11·1 answer
  • For a reaction that follows the general rate law, Rate = k[A][B]2, what will happen to the rate of reaction if the concentration
    8·1 answer
  • A galaxy is a system of celestial bodies, such as stars, planets, several solar systems, and interstellar gas and dust. Our sola
    10·2 answers
  • A period of inactivity in a plant, where it does not grow to survive unfavorable environmental condidtions
    5·2 answers
  • What is the mass of 9.4 moles of B2(Cr207)3?
    13·1 answer
  • Ralph conducted an experiment to study the effect of temperature change on the heart rate of
    10·1 answer
  • Chromium(III) oxide reacts with hydrogen sulfide (H₂S) gas to form chromium(III) sulfide and water:
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!