What is the mass percent of chlorine in magnesium chloride?

Answers

Answer 1

Answer: The total mass of magnesium chloride is 95.21g/mol

The mass of chlorine is 35.45g/mol

To find the mass percent of chlorine, divide its molar mass by the total mass of the substance and multiply the result by 100:
(35.45/95.21)(100)= 37.2%

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In chemical reactions, atoms area. created.
c. rearranged.
b. destroyed.
d. neutralized.

Answers

In chemical reaction, atomsalways are rearranged. They are never destroyed or created because it wouldcontradict the law of conservation of energy. The law of conservation of energystates that a matter cannot be created nor destroyed. It can only be formed inone way or the other. Also it cannot be neutralized. Resulting in one cannot bepart of a chemical reaction. An example of this is the reaction HCl + NaOH-> NaCl + H2O. the reactants and products are not created, they are justformed into another substance.

Final answer:

In chemical reactions, atoms are rearranged to form new substances.

Explanation:

In chemical reactions, atoms are rearranged.

Atoms are the fundamental building blocks of matter, and they cannot be created or destroyed in a chemical reaction. Instead, the atoms that make up the reactants rearrange themselves to form the products of the reaction.

For example, in the reaction between hydrogen gas (H2) and oxygen gas (O2) to form water (H2O), the atoms in the hydrogen and oxygen gases rearrange to form the water molecules. Thus we can correctly predict the arrangement of atoms as described above.

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Alkali metals react with water to produces what product?

Answers

Answer:

Alkali metals react with water to produce hydroxide and hydrogen gas.

Explanation:

That is a chemical property of alkali metals: they are highly reactive and react vigorously with water to produce the correspondant hydroxide and hydrogen gas.

These are some of those reactions:

2Li (s) + 2H₂O (l) → 2LiOH (aq) + H₂(g) ↑

2Na (s) + 2H₂O (l) → 2NaOH (aq) + H₂(g) ↑

2K (s) + 2H₂O (l) → 2KOH (aq) + H₂(g) ↑

The alkali metals are the elements of group 1 of the periodic table: Li, Na, K, Rb, Cs, and Fr. They have one valence electron which may lose easily to form an ion with charge +1.

Final answer:

Alkali metals react with water to produce hydrogen gas and a basic solution of the metal hydroxide (for instance, sodium hydroxide when lithium is in the reaction). This reaction signifies the easier oxidation of alkali metals compared to hydrogen.

Explanation:

When alkali metals react with water, they form hydrogen gas and a basic solution of the metal hydroxide. This vigorous reaction reveals that alkali metals are easier to oxidize than is hydrogen. For instance, considering the reaction of lithium with water:

2Li(s) + 2H₂O(l) --> 2NaOH(aq) + H₂(g)

The solid state (s) lithium reacts with liquid water to generate hydrogen gas and the ionic compound sodium hydroxide. This sodium hydroxide, which is a solid in its pure form, promptly dissolves in water.

The same kind of reaction occurs with other alkali metals and also some alkaline earth metals, although beryllium and magnesium are exceptions.

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A solution of hydrogen peroxide, H2O2, is titrated withpotassium permanganate, KMnO4, according to the following equation: 5H2O2 + 2KMnO4
+ 3H2SO4 = 5O2 + 2MnSO4 + 8H2O + K2SO4. It requires 46.0 mL of 0.145 Mol/L
KMnO4 to titrate 50.0 mL of the solution of H2O2. What is the mole per liter
concentration of H2O2 in the solution?

Answers

5H2O2 + 2KMnO4+ 3H2SO4 = 5O2 + 2MnSO4 + 8H2O + K2SO4

0,145 moles of KMnO4----------in--------1000ml
x moles of KMnO4---------------in------------46ml
x = 0,00667 moles of KMnO4

according to the reaction:
2 moles of KMnO4------------------5 moles of H2O2
0,00667 moles of KMnO4----------------x
x = 0,01668 moles of H2O2

0,01668 moles of H2O2---------in-----------50ml
x moles of H2O2--------------------in----------1000ml
x = 0,334 mol/L H2O2

In Dna, guanine always forms hydrogen bonds with?

Answers

The DNA or deoxyribonucleic acid is composed of a pentose sugar, a base and phosphate group. The bases are adenine, thymine, cytosine and guanine. Guanine always forms hydrogen bonds with cytosine. Remember the statement “Apples in the Tree, Cars in the Garage”. The A stands for adenine and pairs with T-thymine then C – cytosine and G – guanine.

What is the final temperature of the solution formed when 1.52 g of NaOH is added to 35.5 g of water at 20.1 °C in a calorimeter? NaOH (s) → Na+ (aq) + OH– (aq) ∆H = -44.5 kJ/mol

Answers

Answer : The final temperature of the solution in the calorimeter is, $31.0^oC$

Explanation :

First we have to calculate the heat produced.

$\Delta H=(q)/(n)$

where,

$\Delta H$ = enthalpy change = -44.5 kJ/mol

q = heat released = ?

m = mass of $NaOH$ = 1.52 g

Molar mass of $NaOH$ = 40 g/mol

$\text{Moles of }NaOH=\frac{\text{Mass of }NaOH}{\text{Molar mass of }NaOH}=(1.52g)/(40g/mole)=0.038mole$

Now put all the given values in the above formula, we get:

$44.5kJ/mol=(q)/(0.038mol)$

$q=1.691kJ$

Now we have to calculate the final temperature of solution in the calorimeter.

$q=m* c* (T_2-T_1)$

where,

q = heat produced = 1.691 kJ = 1691 J

m = mass of solution = 1.52 + 35.5 = 37.02 g

c = specific heat capacity of water = $4.18J/g^oC$

$T_1$ = initial temperature = $20.1^oC$

$T_2$ = final temperature = ?

Now put all the given values in the above formula, we get:

$1691J=37.02g* 4.18J/g^oC* (T_2-20.1)$

$T_2=31.0^oC$

Thus, the final temperature of the solution in the calorimeter is, $31.0^oC$

Four acids are analyzed and their Ka values are determined. Which of the following values represents the strongest acid?

Answers

Given four acids with different Ka's, the strongest acid will be the one with the greatest Ka. This can be verified by taking the -log(Ka). Larger Ka will result to less pH which means it becomes more acidic. Less Ka means it is relatively basic compared to others.

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