A satellite can move around Earth in a circular orbit at constant height because

How many protons and electrons are present in the mg2+ ion? 1. 14 protons, 14 electrons 2. 12 protons, 10 electrons 3. 12 proton

Mama L [17]

There are 12 protons and 10 electrons in a Mg2+ ion, the normal amount of neutrons is 12.

Explanation:

Magnesium is an element with atomic number 12. This means that every magnesium atom will have 12 protons.

In a magnesium atom, there are 12 electrons, to make the atom have a neutral charge. When an ion is formed, the magnesium atom loses electrons. The 2+charge shows that the magnesium ion has two more protons than electrons. The proton number for magnesium does not change, so Mg2+ must have two less electrons, i.e. 10 electrons.

The number of neutrons varies among different isotopes of magnesium. An isotope of an element means it just has different amounts of neutrons.

The most common isotope of magnesium is 24Mg. This 24 indicates the total number of protons and neutrons. Magnesium has 12 protons, so must have

24−12=12 neutrons

Other isotopes of magnesium have different numbers of neutrons, i.e. 25Mg has 13neutrons, 26Mg has 14 neutrons. 24Mg is most likely being referred to in the question, though.

5 0

4 years ago

How many neutrons are there in 186W

artcher [175]

Question:

How many neutrons are there in 186W

Answer:

112

hope it helps (^^)

# Cary on learning

7 0

3 years ago

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When of a certain molecular compound X are dissolved in of benzene , the freezing point of the solution is measured to be . Calc

puteri [66]

The question is incomplete. Here is the complete question.

When 2.10 g of a certain molecular compound X are dissolved in 65.0 g of benzene (C₆H₆), the freezing point of the solution is measured to be 3.5°C. Calculate the molar mass of X. If you need any additional information on benzene, use only what you find in the ALEKS Data resource. Also, be sure your answer has a unit symbol, and is rounded to 2 significant digits.

Answer: MM = 47.30 g/mol.

Explanation: There is a relationship between freezing point depression and molality. With this last one, is possible to calculate molar mass or molar weight of a compound.

Freezing Point Depression occurs when a solute is added to a solvent: the freezing point of the solvent decreases when a non-volatile solute is incremented.

Molality or molal concentration is a quantity of solute dissolved in a certain mass, in kg, of solvent. Its symbol is m and it's defined as

$m=\frac{moles(solute)}{kg(solvent)}$

Freezing point depression and molal are related as the following:

$\Delta T_{f}=K_{f}.m$

where

$\Delta T_{f}$ is freezing point depression of solution

$K_{f}$ is molal freezing point depression constant

m is molality

Now, to determine molar mass, first, find molality of the mixture:

$\Delta T_{f}=K_{f}.m$

$m=\frac{\Delta T_{f}}{K_{f}}$

For benzene, constant is 5.12°C/molal. Then

$m=\frac{3.5}{5.12}$

m = 0.683 molal

Second, knowing the relationship between molal and moles of solute, determine the last one:

$m=\frac{moles(solute)}{kg(solvent)}$

$mol(solute)=m.kg(solvent)$

mol(solute) = 0.683(0.065)

mol(solute) = 0.044 mol

The definition for Molar mass is the mass in grams of 1 mol of substance:

$n(moles)=\frac{m(g)}{MM(g/mol)}$

$MM=\frac{m}{n}$

In the mixture, there are 0.044 moles of X, so its molecular mass is

$MM=\frac{2.1}{0.044}$

MM = 47.30 g/mol

The molecular compound X has molecular mass of 47.30 g/mol.

7 0

4 years ago

Some landforms develop slowly and other landforms develop rapidly. Which rapidly developing landform is often found in Florida?

deff fn [24]

Answer:

Beaches.

Aquifers.

Sinkholes.

Caverns.

Coastal plains.

Upland (hilly areas)

Swampy Everglades.

Florida Keys (archipelago)

Explanation:

bc these are some of the landforms in flordida

3 0

3 years ago

Which statements describe dark matter? Check all that apply. It is invisible. It is the same as dark energy. It is well understo

Alla [95]

Dark matter is invisible and does not emit electromagnetic radiation. Dark matter is part of a theory that hypothesis the existence of a counterpart to the particles we know in physics, in order to balance the universe that otherwise would be largely unbalanced right now. However, the theory right now is not yet proven.

4 0

3 years ago

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