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2 years ago

A compound containing phosphorus and oxygen has a molar mass of 157.9 g/mol and an empirical formula of PO3 .

Chemistry

1 answer:

Yuki888 [10]2 years ago

3 0

Answer: The molecular formula of the compound is $P_2O_6$

Explanation:

The molecular formula is the chemical formula that tells about the number of atoms of each element present in a compound. Molecular formula and empirical formula can also be the same when the number of atoms is in the simplest whole-number ratio.

To calculate the molecular formula, the number of atoms of the empirical formula is multiplied by a factor known as valency that is represented by the symbol, 'n'.

$n=\frac{\text{Molecular mass}}{\text{Empirical mass}}$ ...(1)

Given empirical formula is $PO_3$

Empirical mass = $[(1\times 30.97) + (3\times 15.99)]=78.94 g/mol$

Molecular mass = 157.9 g/mol

Plugging values in equation 1:

$n=\frac{157.9 g/mol}{78.94g/mol}\\\\n=2$

Molecular formula of the compound becomes $P_{2\times 1}O_{2\times 3}=P_2O_6$

Hence, the molecular formula of the compound is $P_2O_6$

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Could someone explain what oxidation numbers are and what these questions are asking of me?

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The oxidation state, sometimes referred to as oxidation number, describes the degree of oxidation of an atom in a chemical compound.

Explanation:

The oxidation number of an atom is the charge that atom would have if the compound was composed of ions. 1. The oxidation number of an atom is zero in a neutral substance that contains atoms of only one element. The oxidation number of simple ions is equal to the charge on the ion.

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2 years ago

An atom of sodium has an atomic mass of 23 and an atomic number of 11. The atom contains

babunello [35]

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2 years ago

Delicious77 [7]

Answer:

C) How much energy was added to the substance to increase molecule motion?

Explanation:

The most relevant question to ask regarding this change must take into account the physical knowledge about matter.

When matter changes from liquid state to gaseous state, a physical change called evaporation, the particles (molecules or atoms) of the pure substance will separate from each other, take up more space and move faster.

Condensation is the opposite to evaporation, thus the option A) is not the most relevant question.

The charge of the particles does not change; so the option B) is not relevant at all.

The particles should gain energy from the surroundings to increase their motion (kinetic energy) when they pass from liquid state, where they move slower, to gas state, where they move faster. Hence, the option C), How much energy was added to the substance to increase molecule motion? , is totally relevant.

Since this is an increase in the kinetic energy of the molecules, the option D) is not relevant.

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2 years ago

2. How many moles are contained in 0.800 g of calcium chloride (CaCl2)?

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2 years ago

If wind is eroding an area at a rate of 2 mm per year and depositing it in a smaller area at a rate of 7 mm per year, how much l

amid [387]

Answer:

After 2000 years, the first after will be 4m lower.

After 2000 years, the second area will be 14m higher.

Explanation:

From the given information:

At the first area:

if the wind is eroding at 2 mm/year, then after 2000 years; we have:

2 mm/year × 2000 year = 4000 mm

4000 mm to meters, we have:

$=4000 \ mm \times \dfrac{1 \ m}{ 1000 \ mm}$

= 4 m lower

At the second smaller area:

Given that the wind is depositing it at the rate of 7 mm per year;

Then:

7 mm/year × 2000 year = 14000 mm

$=14000 \ mm \times \dfrac{1 \ m}{ 1000 \ mm}$

=14 m higher

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2 years ago