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2 years ago

Given the balanced equation representing a reaction:

2 answers:

6 0

As aluminium loses 12 moles of electrons oxygen gain 12 moles of electrons.

Explanation
4Al + 3 O2→ Al2O3
first write the ions of Aluminium and oxygen

that is, Aluminium ion is = Al^3+
oxygen ion is = O^2-
therefore one atom of Al loses 3 electrons moles while
one atom of O gain 2 electrons moles

from equation above there a total of number of Al atom are 4 =( 1 x4=4) atoms while
Oxygen atoms are 6= ( 3 x2=6) atoms

therefore the total number of Moles of Al lost is = 3 x 4 = 12 moles of electrons

total number of moles of O gained = 2 x6 = 12 moles of electrons

Mamont248 [21]2 years ago

3 0

Base on the question, which of the following that sates the balance of the reaction and as the aluminum loses 12 moles of electrons, what could be the oxygen, and base on my research, the possible answer among them is in number (2) gains 12 moles of electrons, I hope you are satisfied with my answer and feel free to ask for more

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Consider the reaction described by the following chemical equation.

oee [108]

Answer:

Q = -897 kJ/mol

Explanation:

From the given information:

The heat released Q = -65.9 kJ

To start with the molar mass of $H_2O_2$ = 2 × (molar mass of H) + 2 × (molar mass of O)

= (2 × 1.008) + (2 × 16.0 )

= 34.016 g/mol

However, given that:

mass of $H_2O_2$ 2.50 g

The number of moles of $H_2O_2$ = $\dfrac{mass}{molar \ mass}$

$= \dfrac{2.5}{34.016}$

$= 7.349 \times 10^{-2} \ mol$

Finally; Using the formula:

$\Delta H = \dfrac{Q}{number \ of \ moles}\\ \\ Q = \dfrac{-65.9 \ kJ}{7.349 \times 10^{-2} \ mol}$

Q = -897 kJ/mol

6 0

2 years ago

What volume (in liters) does 2.895 moles of oxygen occupy at stp?

LekaFEV [45]

Answer:

64.9 L

Explanation:

pls mark as brainliest

5 0

3 years ago

Use this balanced equation to help you solve:

valentina_108 [34]

1. 842g of NaOH will form 547.3 g of Al(OH)₃

2. The yield is 93.55%

<u>Explanation:</u>

3NaOH + Al → Al(OH)₃ + 3Na

Molar mass of NaOH = 40 g/mol

Molar mass of Al = 27 g/mol

Molar mass of Al(OH)₃ = 78 g/mol

According to the balanced equation:

3 moles of NaOH requires 1 mole of Al to form 1 mole of Al(OH)₃

The ratio of NaOH : Al : Al(OH)₃ = 3 : 1 : 1

3 X 40 g of NaOH reacts with 27 g of Al to form 78 g of Al(OH)₃

120 g of NaOH + 27g of Al → 78 g of Al(OH)₃

120g of NaOH form 78g of Al(OH)₃

1g of NaOH will form $\frac{78}{120}$ g of Al(OH)₃

842g of NaOH will form $\frac{78}{120} X 842 g$ of Al(OH)₃

= 547.3 g of Al(OH)₃

Therefore, 842g of NaOH will form 547.3 g of Al(OH)₃

2. Only 512 g of Al(OH)₃ is formed

Yield % = ?

$Yield = \frac{512}{547.3} X 100\\\\Yield = 93.55$

Therefore, the yield is 93.55%

5 0

3 years ago

What happens to the air as a stove heats it? This question is about thermal expansion and convection, not “it gets hot”.

ratelena [41]

Answer:

When there is heat at the bottom of this air or water, the air or water molecules in contact with the heat start to move, and the molecules spread apart. The heated air or water becomes less dense. It rises up until it gets to air or water with the same density as it has, and when it gets there, it pushes the air or water that was there out of the way. At the same time, new air or water fills the space that was vacated when the heated molecules rose up. The air or water that gets pushed out of the way falls down. This sets up a circular motion. Air or water is heated at the bottom, travels to the top, cools, gets denser, falls, is heated again and the whole cycle starts again. Convection does not occur in space because there is no gravity. Ovens work by convection. The heating coils at the bottom of the oven heat the air which climbs to the top, cools slightly, and falls down again.

Explanation:

8 0

2 years ago

N=S+S A-nt+<br> -an+?<br> What does it mean

Bogdan [553]

n = Number of Moles

S is the symbol for Sulfur

t is usually temperature

+ and - are the charges of molecules

If they're next to each other, it means it's multiplication, or combined elements (molecules)

5 0

2 years ago