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
diamong [38]
3 years ago
12

Naturally occurring magnesium exists as three isotopes. 78.70% is Mg-24 with a mass of 23.98504 amu, 10.13% is Mg-25 with a mass

of 24.98584 amu, and 11.17% is Mg-26 with a mass of 25.98259 amu. What is the atomic mass of magnesium?
Chemistry
1 answer:
Nezavi [6.7K]3 years ago
3 0

Answer:

The correct answer is 24.31 amu.

Explanation:

The formula for finding the average atomic mass = The sum of the percentage abundance of isotopes × the actual mass of isotopes

The average atomic mass = % abundance of Mg-24 × actual mass + % abundance of Mg-25 × its actual mass + % abundance of Mg-26 × its actual mass

Avg. Atomic mass = 0.7870 × 23.98504 + 0.1013 × 24.98584 + 0.1117 × 25.98259

Avg. atomic mass = 18.88 + 2.53 + 2.90 = 24.31 amu

The atomic mass of magnesium is 24.31 amu.

You might be interested in
Why can't methanol, CH3OH, be used as a solvent for sodium amide, NaNH2? Sodium amide is nonpolar and methanol is polar. Sodium
Elodia [21]

Answer: sodium amide undergoes an acid -base reaction

Explanation:

sodium amide is a ionic compound and basically exists as sodium cation and amide anion. Amide anion is highly basic in nature and hence as soon as  there is amide anion generated in the solution , Due to its very pronounced acidity it very quickly abstracts the slightly acidic proton available on methanol.

This leads to formation of ammonia and sodium methoxide.

Hence sodium amide reacts with methanol and abstracts its only acidic proton and form ammonia and sodium Methoxide.

Hence the 3rd statement is a corrects statement.

So we cannot use methanol for sodium amide because sodium amide itself would react with methanol and the inherent molecular natur of sodium amide would then change.

The 1st and 2nd statements both are incorrect because both the compounds methanol as well as sodium amide have dipole moments and hence are polar molecules.

The 4th statement is also incorrect as both the molecules have dipole moment and hence there would be ion-dipole forces operating between them.

The following reaction occurs:

NaNH₂+CH₃OH→NH₃+CH₃ONa

4 0
3 years ago
2 Zn + O2 → 2 ZnO
meriva

Answer:

we need 6.0 moles of zinc (Zn)

Explanation:

Step 1: Data given

Number of moles ZnO produced = 6.0 moles

Step 2: The balanced equation

2 Zn + O2 → 2 ZnO

For 2 moles Zinc we need 1 mol Oxygen to produce 2 moles Zinc oxide

Step 3: Calculate moles zinc

For 2 moles Zn we need 1 mol O2 to produce 2 moles ZnO

For 6.0 moles 2nO produced, we need 6.0 moles of zinc (Zn) and 3.0 moles of O2 to react.

3 0
3 years ago
What is the study of his matter and energy interact? A. Chemistry B. Physics C. Biology D. Planetary science
e-lub [12.9K]

The answer is option (B) Physics

8 0
3 years ago
Read 2 more answers
As the temperature of a gas increases, which of the following explains the effect on the average kinetic energy of the gas?
lidiya [134]
As the temperature of a gas increases, the kinetic energy of the gas particles will also increase. As the temperature of the gas increase, the gas particles gains more energy to move faster, they thus collide more with one another and with the wall of the container, thus increasing pressure as well. So, as the temperature of a gas increases, the kinetic energy increases and the pressure increases as well if the gas is inside an inflexible container. 
8 0
3 years ago
Read 2 more answers
A substance has a volume of 50L and a density of 10.36g/l. What is the mass of the substance?
Lelechka [254]

Answer:

518 g

Explanation:

50L x 10.36 g/L = 518g

3 0
2 years ago
Read 2 more answers
Other questions:
  • How is the empirical formula of copper chloride hydrate found?
    13·1 answer
  • Question 8 Lithium is a solid phase of lithium still unknown to science. The only difference between it and ordinary lithium is
    9·1 answer
  • Water molecules are ____________ because the hydrogen atoms are positively charged on one end and the oxygen atoms are negativel
    11·1 answer
  • Which of the following statements about gases is false?
    12·1 answer
  • There are many diverse species of plants and animals
    14·1 answer
  • Climate change as we know it today is
    5·1 answer
  • 2. Have someone hold the mirror for you, slowly move at least 3 m away from the it.
    8·1 answer
  • Atoms of which of elements will form covalent bonds in a compound
    6·1 answer
  • During the process of nuclear decay what form of energy is released?
    15·1 answer
  • Please calculate the mass percent of water in the formula: NiSO4.3 H2O
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!