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Valentin [98]
2 years ago
5

In a certain compound of iron and oxygen, FexOy, it is found that a sample of this compound weighing 6.285 g contains 4.396 g of

Fe. What is the formula of the oxide?
Chemistry
1 answer:
saveliy_v [14]2 years ago
5 0

Answer:

Formula of oxide is Fe_{2}O_{3}

Explanation:

The given compound consists of Fe and O.

So, mass of oxygen in sample = (mass of sample) - (mass of Fe in sample)

                                                   = (6.285 g ) - (4.396 g)

                                                   = 1.889 g

Molar mass of O = 16 g/mol and molar mass of Fe = 55.845 g/mol

So, ratio of number of moles of Fe and O (Fe : O)

      = \frac{4.396}{55.845}:\frac{1.889}{16}

      = 0.0787 : 0.118

      = 1:\frac{0.118}{0.0787}

      = 1 : 1.5

      = 2 : 3

So, formula of oxide is Fe_{2}O_{3}

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SnO2 is reduced by carbon according to this reaction: SnO2 + C ???? Sn + CO2. How many liters of CO2 are produced if 300.0 grams
andrew-mc [135]

Explanation:

The given reaction is as follows.

         SnO_{2} + C \rightarrow Sn + O_{2}

a).   Molar mass of SnO_{2} is [(mass of Sn) + (2 × mass of O)].

Therefore, molar mass of SnO_{2} = (118.7 + 2 × 16) g/mol = 150.7 g/mol

Since, it is known that number of moles equal mass divided by molar mass. So, moles of Sn will be calculated as follows.

               No. of moles = \frac{mass}{molar mass of SnO_{2}}

                                      = \frac{300 g}{150.7 g/mol}

                                      = 2.53 mol

As it is given that 1 mole of SnO_{2} produces 1 moles of Sn and 1 moles of CO_{2}. Hence, 2.53 moles of SnO_{2} will also produce 2.53 moles of Sn and 2.53 moles of CO_{2}.

Volume of 1 mole of CO_{2} at STP is 22.4 L. Therefore, volume of 2.53 moles of CO_{2} will be calculated as follows.

                  2.53 × 22.5 L = 56.67 L

Hence, 56.67 L of CO_{2} are produced if 300.0 grams of tin are produced at STP.

b).  Mass of tin is given as 1800.0 g. So, number of moles will be calculated as follows.

               No. of moles = \frac{mass}{molar mass of tin}

                                      = \frac{1800.0 g}{118.7 g/mol}

                                      = 15.2 moles

As 15.2 moles of SnO_{2} produces 15.2 moles of Sn. Therefore, weight of SnO_{2} will be calculated as follows.

                   Mass = no. of moles × molar mass of SnO_{2}

                             = 15.2 moles × 150.7 g/mol

                             = 2290.64 g

Hence, 2290.64 grams of SnO_{2} are required to produce 1800.0 grams of tin.

c).   Mass of carbon given is 100.0 grams.

             No. of moles = \frac{mass}{molar mass of carbon}

                                    = \frac{100 g}{12 g/mol}

                                      = 8.33 moles

As, 1 mole of carbon is produced by 1 mole of tin. So, 8.33 mole of carbon will be produced by 8.33 moles of tin.

Therefore, calculate mass of tin produced as follows.

                        Mass = no. of moles × molar mass of Sn

                             = 8.33 moles × 118.7 g/mol

                             = 988.8 g

Hence, 988.8 grams of tin will be produced per 100 grams of carbon used.

8 0
2 years ago
CAN SOMEONE PLEASEEEE DO THIS!!! ASAP ILL GUVE AS MANY POINTS AS I CAN Laboratory Techniques Lab Report
qwelly [4]

Answer:

how do you need me to help

Explanation:

7 0
2 years ago
What do you think happens to Difluoroethane at –24°C? Provide evidence to support your claim.
balandron [24]

Answer:

The following subsections explain the explanation according to the particular circumstance.

Explanation:

  • The boiling point seems to be the temperature beyond which the working fluid as well as the boiling phase would be at a predetermined pressure or voltage at equilibrium among one another and.  
  • The vapor or boiling temperature of 1,1 difluoroethane seems to be -25oC at 1 atm, although as a gas it can remain at a higher temperature around -24oC.
6 0
2 years ago
When you tapped the stick on one end of the tape, did you see a wave that
rusak2 [61]

Answer:

Yes.

Explanation:

Yes, I did see a wave that formed and rolled down the line because of tapping the stick on one end of the tape. The wave that had been created goes from one side of the tape to the other end of the tape. This movement occur in the tape due to the disturbance at one end of the tape so we can say that wave formed in the tape and rolled down the line.

7 0
2 years ago
How many paired and unpaired electrons are in magnesium?
pychu [463]

Answer:

Paired = 12

Unpaired = 0

Explanation:

Magnesium is alkaline earth metal.

It is present in second group.

Its atomic number is 12 and atomic mass 24 amu.

Electronic configuration:

Mg₁₂ = 1s² 2s² 2p⁶ 3s²

It can seen from electronic configuration that all electrons are paired because s subshell have one orbital and it can accomodate two electrons. Each s subshells in magnesium have two electrons so these are filled and have paired electrons. While p subshell have three orbitals and can accomodate six electrons two by each orbital with opposite spin thus 2p is also filled and have paired electrons.

8 0
2 years ago
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