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3 years ago

which number should be placed before F2 on the reactants side equation to make equation balanced? Xe + ___F2 > XeF4

Chemistry

2 answers:

jolli1 [7]3 years ago

5 0

Answer:

The number that should be placed before F₂ is 2

Explanation:

For a chemical reaction to be balanced we need to have the same amount of mass in the reactants and in the products because by the<em> law of conservation of mass</em>, mass cannot be created or destroyed.

We can acomplish this by having the same amount of atoms of each element in the reactant side that in the product side.

For example:

C₃H₈ + 5O₂ → 3CO₂ + 4H₂0

In this case in the reactants side we have 3 C, 8 H and 10 O, so we have the same amount in the product side, so the equation is balanced.

In the equation Xe + F₂ → XeF₄ we have 1 Xe in each side, 2 F in the reactant side and 4 F in the product side, so we multiply the 2 F in reactan side to balance the equation.

Xe + 2Fe₂ → XeF₄

Ivahew [28]3 years ago

3 0

There are four F atoms on the products side.

Since two more F atoms are required on the reactant side, you multiply the number of F2 molecules by two.

So 2 should be placed in front of F2

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2 AIPO4 + 3 BaCl2 --> 2 AICIz + 1 Baz(PO4)2

givi [52]

Answer:

12.3 moles of $AlCl_{3}$ are produced by reacting 18.4 moles of $BaCl_{2}$ .

Explanation:

Balanced reaction: $2AlPO_{4}+3BaCl_{2}\rightarrow 2AlCl_{3}+Ba_{3}(PO_{4})_{2}$

According to balanced equation:

3 molecules of $BaCl_{2}$ produce 2 molecules of $AlCl_{3}$

So $3N_{A}$ molecules of $BaCl_{2}$ produce $2N_{A}$ molecules of $AlCl_{3}$ ( $N_{A}$ is avogadro number).

We know 1 mol of molecule = $N_{A}$ number of molecules.

So 3 moles of $BaCl_{2}$ produce 2 moles of $AlCl_{3}$ .

Hence 18.4 moles of $BaCl_{2}$ produce $(\frac{2}{3}\times 18.4)$ moles of $AlCl_{3}$ or 12.3 moles of $AlCl_{3}$ .

3 0

3 years ago

HURRRYYYY!!!!<br> Which of the following will lead to a thunderstorm?

romanna [79]

C!!!! The third one!

3 0

3 years ago

An electron has _____.

irina [24]

Answer:

An electron has more mass than a proton or a neutron.

Explanation:

Mass of electron - 9.109 e-31 kg

hope it helps!!

7 0

3 years ago

The Ksp can be used to find the concentration of hydroxide ions, and thus determine the pH given a concentration of of aluminum.

Anton [14]

Answer:

3.9.

Explanation:

(Molar mass of 342.15 g/mol).

The first thing to do in this question is to coverts our units. We are given 6.70 lb = 453.592 × 6.70 lb = 3039.0664 g of aluminum sulfate.

2050 gallons of water = 2050 × 3.785 = 7759.25 Litres.

After this we will now look for the Concentration aluminum sulfate using the formula below:

Concentration = number of moles ÷ volume. ------------------------------------(1).

Recall; Number of moles = 3039.0664/ 342.15 = 8.8823 moles. The volume = 2050 gallons = 7759.25 Litres.

Therefore, slotting in the values of of number of moles and volume into the equation (1) above, we have;

Concentration= 8.8823 moles/ 7759.25 Litres. = 0.001145 M.

The next equation we are going to make use of today is that of the solubilty product that is;

Ksp = (Al^3+) (OH^-)^3.

So, we have the ksp = 1.3 × 10^-33 and the value of (Al^3+)= 0.001145 M.

Hence, making (OH^-) the subject of the formula;

(OH^-) = ( 1.3 × 10^-33 / 0.001145)^1/3.

(OH^-) = 8 × 10^-11 M.

Hence, pOH = - log (OH^-)

pOH = - log (8 × 10^-11).

pOH = 10.1

Therefore, the values of pH is; 1

pH + pOH = 14.

pH = 14 - 10.1 = 3.9.

3 0

3 years ago

The number main-group elements'valance electrons can be determined by____ on the periodic table

Zanzabum

<h2>Answer:</h2>

Valance electrons can be determined by <u>Group</u> on the periodic table

<h2>Explanation:</h2>

Valence electrons are the electrons present in the outermost shell of an atom. We can determine the total number of valence electrons present in an atom by checking at its Group in which it is placed in the periodic table. For example, atoms in Groups 1 the number of valence electron is one and for group 2 the number of valence electrons is 2.
The groups have number of valance electrons as follow:

Group 1 - 1 valence electron.

Group 2 - 2 valance electrons.

Group 13 - 3 valence electrons.

Group 14 - 4 valance electrons.

Group 15 - 5 valence electrons.

Group 16 - 6 valence electrons.

Group 17 - 7 valence electrons.

Group 18 - 8 valence electrons.

Result: No of valence electron can be determined by the group no. of the element.

7 0

3 years ago