Chemistry, 21.07.2019 03:31 Qpaoswp34

When a 30.98-g sample of phosphorus reacts with oxygen, a 71.00-g sample of phosphorus oxide is formed. what is the percent composition of the compound? what is the empirical formula for this compound?

Answers: 2

Show answers

Answers

Answer from: jourdyno

- P = 43.63% and O = 56.37% and the empirical formula is P_2O_5

Solution:- mass of Phosphorous = 30.98 g

mass of product(phosphorous oxide) = 71.00 g

mass of oxygen = 71.00 - 30.98 = 40.02 g

percentage of phosphorous in the compound = (30.98/71.00)100 = 43.63%

percentage of oxygen in the compound = (40.02/71.00)100 = 56.37%

moles of P = 30.98 g x ( 1mol/30.97 g) = 1.00 mol

moles of O = 40.02 g x (1 mol/ 16.00 g) = 2.50 mol

Ratio of moles of P to O is 1.00:2.50

The whole number ratio is 2:5

So, the empirical formula of the phosphorous oxide formed is P_2O_5

Answer from: Monicaamm12983

Answer : The percent composition of P = 43.63 % and O = 53.37 % .

Empirical formula of Phosphorous oxide = P₂O₅

Part A : Percent composition :

It is percent of each element present in compound . It is given by formula :

$Percent composition = \frac{mass of element}{ total mass of compound } * 100$

Given : Mass of Phosphorous (P ) = 30.98 g

Mass of Compound Phosphorous oxide = 71.00 g

Mass of Oxygen (O) = mass of compound - mass of P

= 71.00 g - 30.98 g = 40.02 g

$Percent composition of P = \frac{mass of P }{ mass of compound}$ $= \frac{30.98 g }{71.00 g} * 100$

Percent composition of P = 43.63 %

$Percent composition of O = \frac{mass of Al}{Mass of compound } * 100 = \frac{40.02 g }{71.00 g} * 100$

Percent composition of O = 53.37 %

Part B : Empirical formula of Phosphorous Oxide.

Empirical formula is formula which shows the proportion of element present in a compound . Following are the steps to calculate empirical formula of an compound :

Step 1 : Find masses of each element .

Mass of P = 30.98 g

Mass of O = 40.02 g

Step 2 : Conversion of masses of element to its mole .

$Mole = \frac{mass }{molar mass }$

Given : Mass of P = 30.98 g $Molar mass of P = 30.97 \frac{g}{ mol}$

$Mole of P = \frac{30.98 g }{30.97\frac{g}{mol} } = 1 mol$

Given: Mass of O = 40.02 g $Molar mass of O = 15.99\frac{g}{mol}$

$Mole of O = \frac{40.02 g}{15.99\frac{g}{mol}} = 2.5 mol$

Step 3 : Finding Ratio of mole .

In this step ratio is found by dividing each mole by smallest mole .Since mole of P is smaller , so this will be used for division.

$Ratio of mole of P= \frac{mole of P }{mole of P } = \frac{1 mol}{1 mol} = 1$

$Ratio of mole of O = \frac{ mole of O }{mole of P } = \frac{2.5 }{1 } = 2.5$

Hence , Ratio of P : O = 1 : 2.5

Since the ratio is in fraction , it need to be converted to whole number . So we multiply the ratio by such a minimum number which gives us a whole number ratio. This step is skipped if the ratio already comes in whole number.

On multiplication the ratio by 2 :

Ratio of P : O = ( 1 : 2.5 ) * 2 = 1 * 2 : 2.5 * 2

Ratio of P : O = 2 : 5

Step 4 : Writing the empirical formula

The ratio of P and O is 2: 5 , which gives the empirical formula of compound as P₂O₅ .

Answer from: Quest

ill try to . no promises tho.

explanation:

Answer from: Quest

Read the sentences below in 1962, i tried to enroll as the first black student at the university of mississippi. the governor of mississippi blocked my entrance which best describes the verbs used in the sentences? o they are past tense verbs, which are often used in narrative essays o they are past tense verbs, which are not often used in narrative essays. o they are future tense verbs, which are often used in narrative essays o they are future tense verbs, which are not often used in narrative essays.

Another question on Chemistry

Chemistry, 22.06.2019 04:30

Acamcorder has a power rating of 17 watts. if the output voltage from its battery is 7 volts, what current does it use?units:

Answers: 1

Answer

Chemistry, 22.06.2019 21:30

Is this correct if not can u correct me

Answers: 3

Answer

Chemistry, 22.06.2019 22:40

37.0 °c = °f (human body normal temperature)

Answers: 1

Answer

Chemistry, 23.06.2019 02:00

Pinene is an unsaturated hydrocarbon found in pine resin. if pinene has m+ = 136 and contains 1 double bond(s) and 2 ring(s); what is its molecular formula? enter the formula in the form ch first, then all other atoms in alphabetical order; do not use subscripts. the formula is case-sensitive

Answers: 3

Answer

You know the right answer?

When a 30.98-g sample of phosphorus reacts with oxygen, a 71.00-g sample of phosphorus oxide is form...

Questions