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user100 [1]
3 years ago
10

17. When 1 mol of the following substances react completely with oxygen, the

Chemistry
2 answers:
Len [333]3 years ago
3 0
I would say Na. Oxygen has 2 valence electrons and when reacting with other molecules, the ones with the fullest or emptiest shells will react the least. Both H2 and Na are in the Alkali Metals in the first row, but since H2 has 2 molecules, it would use more oxygen than Ana
goldenfox [79]3 years ago
3 0

Answer:

Option A. Na

Explanation:

Let us generate a balanced equation for the reaction of O2 with the individual elements. This is illustrated below:

1. 4Na + O2 —> 2Na2O

From the equation,

4moles of Na comsumed 1mole of O2.

Therefore, 1mole of Na will comsume = 1/4 = 0.25mol of O2.

2. 2Ca + O2 —> 2CaO

From the equation,

2moles of Ca consumed 1 mole of O2.

Therefore, 1mole of Ca will consume = 1/2 = 0.5mole of O2

3. 4Al + 3O2 —> 2Al2O3

From the equation,

4moles of Al consumed 3moles of O2.

Therefore, 1mole of Al will consume = 3/4 = 0.75mol of O2

4. 2H2 + O2 —> 2H2O

From the equation,

2moles of H2 consumed 1mole of O2.

Therefore, 1mole of H2 will consume = 1/2 = 0.5mole of O2

The following data were obtained from the above calculations:

1mole of Na requires 0.25mol of O2

1mole of Ca requires 0.5mole of O2

1mole of Al requires 0.75mol of O2

1mole of H2 requires 0.5mole of O2

From the above, we see clearly that 1mole of Na consumes the least amount of O2

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Is barium hydroxide Ba(OH)2 or is BaOH?
KiRa [710]

Answer:

What is the charge on the barium ion and what is the charge of the hydroxide ion.

Explanation:

To get the correct formula they have to add to zero over all.

6 0
3 years ago
What is the classification of a solution of naoh with a ph of 8.3?
Maksim231197 [3]

Answer:

  • <u>Alkaline or basic solution </u>(alkaline and basic means the same)

Explanation:

According to the <em>pH</em>,  solutions may be classified as neutral, acidic, or alkaline (basic).

This table shows such classification:

pH               classification

  7                   neutral

> 7                   alkaline or basic

< 7                   acidic

Thus, since the pH of the solution is 8.3, which is greater than 7, the solution is classified as basic (alkaline).

Additionally, you must learn that pH is a logarithmic scale for the concentration of hydronium ions in the solution.

  • pH = - log [H₃O⁺]

You can calculate the concentration of hydronium ions using antilogarithm properties:

pH=-log[H_3O^+]\\ \\ {[H_3O^+]}=10^{-pH}\\ \\ {[H_3O^+]}=10^{-8.3}=0.00000000501

NaOH solutions are alkaline solutions, bases, according to Arrhenius model,  because they contain OH⁻ ions and release them when ionize in water.

8 0
3 years ago
How do you convert from grabs to moles of a substance
Lorico [155]

The correct question is as follows:

How do you convert from grams to moles of a substance

1. Divide by the molar mass

2. Subtract the molar mass

3. Add the molar mass

4. Multiple by the molar mass

Answer: In order to convert from grams to moles of a substance divide by the molar mass.

Explanation:

The number of moles of a substance is the mass of substance in grams divided by its molar mass.

The formula to calculate moles is as follows.

Moles = \frac{mass}{molar mass}

This means that grams are converted to moles when grams is divided by molar mass.

Thus, we can conclude that in order to convert from grams to moles of a substance divide by the molar mass.

8 0
3 years ago
Convert 29.85 degree Celsius to Kelvin
Vlad [161]

Answer:

its 303 Kelvin. (typing this for characters)

4 0
3 years ago
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