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
alexira [117]
3 years ago
11

Please help me !!!!

Chemistry
1 answer:
just olya [345]3 years ago
3 0

Answer:

12, 28, 16

Explanation:

If we are trying to find mass, neutrons are our guy. 28 "mass points" means 28 neutrons. Each neutron is one point

We know there are 12 protons and electrons if we look at a table of elements, the number in the top-left is always the number of protons and we can subtract mass from the protons to get our electrons

You might be interested in
What is the volume of HCl gas required to react with excess magnesium metal to produce 6.82 L of hydrogen gas at 2.19 atm and 35
prohojiy [21]

Answer:

Explanation:

2 HCl(g) + Mg(s) → MgCl₂(s) + H₂(g)

Let's calculate the quantity of mole of produced hydrogen with the Ideal Gases Law

P . V = n . R .T

2.19 atm . 6.82L = n . 0.082 . 308K

(2.19 atm . 6.82L) / (0.082 . 308K) = n

0.591 mol = n

1 mol of H₂ gas came from 2 mol of hydrochloric, so, 0.591 mol came from the double of mole

0.591 .2 = 1.182 mole of acid.

Molar mass of HCl = 36.45 g/m

1.182 mole are (36.45 g/m . 1.182g ) contained in 43.1 g

Density HCl = HCl mass / HCl volume

0,118 g/mL = 43.1 g / HCl volume

43.1 g / 0.118 g/mL = 365.3 mL (HCl volume)

5 0
3 years ago
What is the contrast of these two atoms?
Katena32 [7]

Answer:

The atomic number of silicon is 14 while atomic mass of carbon is 14.

Explanation:

An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.

All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example if neutral atom has 6 protons than it must have 6 electrons. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.

In given atoms ¹⁴₆C  and ²⁸₁₄Si the atomic mass of carbon is 14 while the atomic number of silicon is 14. It means silicon has 14 electrons or protons while carbon has 6 protons or electrons because its atomic number is 6. Carbon has 6 protons and 8 neutrons in its nucleus while silicon has 14 protons and 14 neutrons in its nucleus.

In C:

Number of neutrons + protons = 8 + 6 = 14 amu (mass number)

Number of electrons = 6

In Si:

Number of neutrons + protons = 14 + 14 = 28 amu (mass number)

Number of electrons = 14

6 0
3 years ago
Which type of ion usually undergoes reduction?
Karo-lina-s [1.5K]

Answer:

anion

Explanation:

anion undergoes reduction.

cation undergoes oxidation.

3 0
3 years ago
What is the mass of 8.90 moles of magnesium chloride, MgCl2?
Mazyrski [523]
<span>(8.90/95.211) =0.09347 moles</span>
3 0
3 years ago
How does a sedimentary rock turn into a metamorphic rock?
Korvikt [17]
1. weathering and erosion on Earth's surface is always breaking Rock down 2. Transport 3. Deposition 4. Compaction and cementation. 5. Metamorphism 6. rock melt
6 0
3 years ago
Other questions:
  • New York state index fossil Valcouroceras is classified as
    5·1 answer
  • How many molecules of SO2 are in 2.45 g of SO2? (molar mass=64.06 g/mol). (Hint: you need to use your entire stoichiometry flow
    6·1 answer
  • Find molar mass of gold
    8·2 answers
  • One symptom of carbon monoxide poisoning is the development of Mees lines on the fingernails and toenails.
    13·2 answers
  • SOME HELP WOULD BE NICE!!! PLEASEEE
    11·1 answer
  • What is the pH of .038 M HCI?
    10·1 answer
  • The independent variable and dependent and constant
    8·1 answer
  • Hi! Can I have someone that is In the lgbtq+ talk to me, I need some advice...
    8·2 answers
  • Among the following scenarios, which best demonstrates resilience when confronted with stress?
    6·1 answer
  • After mg ribbon is reacted completely with air, what is the reason to add some water and heat?
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!