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
Kamila [148]
3 years ago
8

Why atomic mass is an average vàlue​

Chemistry
2 answers:
elena-s [515]3 years ago
7 0

Answer:

There are different isotopes for different elements

Explanation:

The mass of each of the isotopes of an element are added with their percentage each then they are divided by 100

Example boron 11 is 80 % boron 10 is 20%

Total mass of boron 10 is 20*10

Total mass of boron 11 is 80*11

Atomic mass is (20*10)+(80*11)/100

Which is 10.8 and it is rounded off as 11 in the periodic table

lukranit [14]3 years ago
4 0

Answer:

The atomic mass is the average number of protons and neutrons for all natural isotopes of an element. It is a decimal number.

Explanation:

Atomic Mass and Mass Number Example :

Hydrogen has three natural isotopes: 1H, 2H, and 3H. Each isotope has a different mass number.

1H has 1 proton. Its mass number is 1. 2H has 1 proton and 1 neutron. Its mass number is 2. 3H has 1 proton and 2 neutrons. Its mass number is 3. 99.98% of all hydrogen is 1H 0.018% of all hydrogen is 2H 0.002% of all hydrogen is 3H Together, they give a value of atomic mass of hydrogen equal to 1.0079 g/mol.

You might be interested in
¿Cómo se llama el grupo IIA de la tabla periódica?
Verdich [7]

Answer:

los metales alcalinotérreos: berilio (Be), magnesio (Mg), calcio (Ca), estroncio (Sr), bario (Ba) y radio (Ra).

o simplemente llamado grupo 2A

Explanation:

8 0
3 years ago
Water is amphoteric. If it reacts with a compound that is a stronger acid than itself, water acts as a
kirza4 [7]

Answer:

Water acts as a base in the presence of a strong acid

Explanation:

Water,being an amphoteric compound, can act both as an acid and as a base.

In the presence of an acid , water acts as a base but in the presence of a base, water acts as an acid.

5 0
3 years ago
If oxygen is removed from a sample of air as iron rust, what happens to the particle pressure of oxygen in the air?
klasskru [66]

Answer : It increases

Rusting is where oxygen binds to iron and forms iron oxide.

So once iron rusts, there is oxygen, just not in air; it's in the iron oxide.


All reactions are reversible, albeit at different rates (the "irreversible" ones are still reversible, but much slower given that they take so much collision luck and energy.

5 0
3 years ago
What does this image represent?
umka2103 [35]
I don’t really have a clear answer for you but this might help

7 0
3 years ago
Read 2 more answers
Please help me with this. (: I'd appreciate it.
Soloha48 [4]

Answer:

The answer to your question is:  ΔH = -283 kJ/mol, first option

Explanation:

Reaction

                CO  +  O₂     ⇒     CO₂

ΔH = ∑H products - ∑H products

ΔH = -393.5 - (-110.5 + 0)

ΔH = -393.5 + 110.5

ΔH = -283 kJ/mol

4 0
3 years ago
Other questions:
  • Which condition is necessary for water droplets to condense and form clouds? dry air, ice crystals in air, tiny particles in air
    9·2 answers
  • How many moles of MgS2O3 are in 221 g of the compound?
    15·1 answer
  • Look at the reaction below.
    8·2 answers
  • What is the charge for all elements in group 1A
    7·1 answer
  • What will happen if you add a mild acid to a solution that is buffered at ph = 7?
    13·1 answer
  • In the process of photosynthesis, carbon dioxide and water react chemically, with the help of sunlight, to produce oxygen
    6·1 answer
  • The center of an atom is called the
    10·1 answer
  • How many grams are equal to 413 kg
    12·2 answers
  • Which is true about models in science?
    15·2 answers
  • Plssss help i am giving out a lot of points
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!