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weeeeeb [17]
3 years ago
14

A student wants to reclaim the iron from an 18.0 gram sample of iron (III) oxide, which occurs according to the reaction below:

how many grams of iron can be reclaimed.
Chemistry
1 answer:
geniusboy [140]3 years ago
4 0

Answer:

12.6 g

Explanation:

Step 1: Write the balanced decomposition reaction

2 Fe₂O₃ ⇒ 4 Fe + 3 O₂

Step 2: Calculate the moles corresponding to 18.0 g of Fe₂O₃

The molar mass of Fe₂O₃ is 159.69 g/mol.

18.0 g × 1 mol/159.69 g = 0.113 mol

Step 3: Calculate the moles of Fe formed from 0.113 moles of Fe₂O₃

The molar ratio of Fe₂O₃ to Fe is 2:4. The moles of Fe formed are 4/2 × 0.113 mol = 0.226 mol

Step 4: Calculate the mass corresponding to 0.226 moles of Fe

The molar mass of Fe is 55.85 g/mol.

0.226 mol × 55.85 g/mol = 12.6 g

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How much heat is needed to change 5g of ice at 0°C to<br> water at 50°C?
natta225 [31]

Answer:

400cal

Explanation:

Since ice melted at 0 Celesius then the heat gained by ice (latent heat) will melt it so you should substitute in that law

Q=mlf ..where Q is the heat required to convert ice to water , m is the mass of ice and lf is the latent heat of fusion

Q=5∗80=400cal

6 0
3 years ago
Which of the following symbols represents a chlorine ion with a stable arrangement of eight valence electrons?
frozen [14]

A stable arrangement of eight valence electrons : ³⁵Cl⁻¹

<h3>Further explanation</h3>

Chlorine is a halogen gas, located in group 17, p block

Chlorine has an atomic number of 17 and an atomic mass of 35

Electron configuration: [Ne] 3s²3p⁵

If we look at the electron configuration, then Cl will bind 1 more electron so that the configuration is stable like Argon (atomic number 18)

So by binding this one electron, chlorine forms negative ions (anions)

³⁵Cl⁻¹

B. Cl⁻² binds 2 electrons, exceeding the octet rule

C. Cl⁺¹, releases 1 electron, remains unstable

D. Cl, the neutral form of Cl, is still unstable with a 7-electron valence configuration

3 0
3 years ago
At what temperature does 0.019135 moles of Ne in a 878.3 mL container exert a pressure of 0.946 atm?
Reika [66]
<h3>Answer:</h3>

Temperature is 529.164 K

<h3>Explanation:</h3>

We are given

Number of moles of Ne (n) =  0.019135 moles

Volume (V) = 878.3 mL

Pressure (P) = 0.946 atm

We are required to calculate the temperature;

We can do this using the ideal gas law equation which is;

PV = nRT, where P is the pressure, n is the number of moles, V is the volume, R is the ideal gas constant (0.082057 Latm/mol/K) and T is the temperature.

From the equation;

T=\frac{PV}{nR}

T = \frac{(0.946)(0.8783)}{(0.082057)(0.019135)}

T=529.164 K

Therefore, the temperature will be 529.164 K.

5 0
3 years ago
Read 2 more answers
Predict the products and write balanced net ionic equations for the following reactions. (g) SnCl2 is added to KMnO4 solution (a
ch4aika [34]

Answer:

The answer to your question is:

Explanation:

Reaction

                  SnCl₂    +    2KMnO₄     ⇒    2 KCl     +    Sn(MnO₄)₂

                                               1 ----   Sn ----  1

                                               2 ----   K  ----- 2

                                               2 ----  Mn ----  2

                                               8 ----    O ----  8

                                               2 ----   Cl ----  2

6 0
3 years ago
Identify the intermolecular forces present in each of these substances ch4
djverab [1.8K]
There are four type of intermolecular forces: ionic, dipole-dipole, hydrogen bonds and London disperssion forces.

CH4 have  no ions, so there are  not ionic forces.

CH4 is a symetrical molecule, so there cannot be a net dipole in the molecule, so there is not dipole-dipole interaction.

Hydrogen bonding is only possbile when H is bonded to N, O or F, beacuse they are the atoms that considerable higher electgronegativy than hydrogen.

So, the only intermolecular force present in CH4 molecules is London disperssion forces, which is a force present in any molecule and is the weakiest one. That explains the low melting and boiling points of CH4. 
7 0
3 years ago
Read 2 more answers
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