All categories

3 years ago

Question 2

Chemistry

1 answer:

azamat3 years ago

8 0

Answer:

Explanation:

For A, 2Al(OH)3 contains 6H on the left side of the equation but only has 3H on the right side of the equation, thus its not balanced

For B, there is 2(Al2), which is 4, on the left side of the equation but only 2Al on the right side of the equation, so it is not balanced.

For D, theres a total of 6 H on the left side of the equation as there is (OH)3 and 3H, but none of the right side, so its not balanced.

C is the correct answer as

on the left side of the equation:

2 Al(OH)3 has 2Al, 6O, and 6H

on the right side of the equation:

Al2O3 has 2Al and 3O

3 H20 has 3H and 6O

this makes a total of 2Al, 6H and 6O, which is equal to the number of each element in the left side, thus it is balanced and is the right answer.

In the future for these type of qns, you want to add up the number of each element on the left, then the ride, and see compare the numver of element they have. if the number of all the elements on both sides are the same, the equation is balanced.

You might be interested in

Question 6 The mineral barite, (BaSO.) has a ke of 1.1 x 10" at 25°C. Calculate the solubility of barium sulfate in water, in: 6

Sav [38]

Explanation:

(6.1). The reaction equation will be as follows.

$BaSO_{4}(s) \rightleftharpoons Ba^{2+}(aq) + SO^{2-}_{4}(aq)$

Assuming the value of $K_{sp}$ as $1.1 \times 10^{-10}$ and let the solubility of each specie involved in this reaction is "s". The expression for $K_{sp}$ will be as follows.

$K_{sp} = [Ba^{2+}][SO^{-}_{2}]$ (Solids are nor considered)

= $s \times s$

s = $\sqrt{K_{sp}}$

= $\sqrt{1.1 \times 10^{-10}}$

= $1.05 \times 10^{-5}$

Therefore, solubility of barium sulfate in water is $1.05 \times 10^{-5}$ .

(6.2). As the molar mass of $BaSO_{4}$ is 233.38 g/mol

Therefore, the solubility is g/L will be calculated as follows.

$233.38 g/mol \times 1.05 \times 10^{-5}$

= $2.45 \times 10^{-3} g/L$

Therefore, solubility of barium sulfate in grams per liter is $2.45 \times 10^{-3} g/L$ .

8 0

3 years ago

Which element has 32 protons in its nucleus?

BartSMP [9]

germanium has 32 protons in its nucleus

3 0

4 years ago

Read 2 more answers

How to find efficiency of a pulley system

Digiron [165]

Multiply the weight of the object by the distance it traveled to find the amount of work output. For the example: 10 lbs. x 1 foot = 10 foot-pounds. Find the work efficiency by dividing the work output by the work input and multiplying by 100.

8 0

4 years ago

Which of the following conversion factors is correct to convert 0.25 moles of Na to particles of Na?

Stolb23 [73]

Answer:

6.02×10²³ particles / 1 mol

Explanation:

In this question the choices are missed.

For determine the particles of Na, in 0.25 moles we should know that the mole referrs to the Avogadro's number.

1 mol of anything contains 6.02×10²³ entities, that's why we should apply this conversion factor to find the final answer:

0.25 mol . 6.02×10²³ particles / 1 mol = 1.50×10²³ particles

In conclussion: 1.50×10²³ particles of Na are contained in 0.25 moles of Na

5 0

4 years ago

Is specific heat capacity always equal to heat capacity?

Luda [366]

Answer:

No specific heat capacity and heat capacity are not equal

8 0

3 years ago