Which mixture can be separated through filtration because one the substances is insoluble in water?

S8 + 12 O2 —> 8 SO3 what volume of oxygen would be required to completely react with 45.7g of S8

ahrayia [7]

Answer:

47.9L of oxygen would be required

Explanation:

Assuming oxygen gas is at STP

Based on the reaction:

S₈ + 12 O₂ → 8SO₃

1 mole of S₈ (Molar mass: 256.52g/mol) reacts with 12 moles of oxygen.

To solve this question we must find the moles of S₈ added. With the reaction we can find the moles of O₂ and using PV = nRT we can find the volume of oxygen required:

Moles S₈:

45.7g * (1mol / 256.52g) = 0.178 moles S₈

Moles O₂:

0.178 moles S₈ * (12 moles O₂ / 1mol S₈) = 2.138 moles O₂

Volume O₂:

PV = nRT

V = nRT / P

Where V is volume

n are moles = 2.138 moles

R is gas constant 0.082atmL/molK

T is absolute temperature = 273.15K at sTP

P is pressure = 1 atm at STP

V = 2.138mol*0.082atmL/molK*273.15K / 1atm

V = 47.9L of oxygen would be required

4 0

3 years ago

What mass of salt would you need to add to 1.00kg of water to achieve a freezing point of -5 degrees C

Serga [27]

Answer:

The type of salt to be added to the water is not known from the question but no worries, I will try to give you the step by step procedure to answer any type of question similar to this.

To answer this question, we should know some facts.

1. the molar freezing point depression constant of water (Kf) = 1.86 K kg/mol

2. the molar mass of the salt if NaCl = 58.5 g/mol ; KCl = 74.5 g/mol

3. since the salt can dissociate if NaCl or KCl into two ions, the Van't Hoff factor ( i )= 2

Note that: the change in freezing point, molarity, deepression constant and van't Hoff factor are related by this formula;

ΔTf = i Kf m

So lets take NaCl as the salt:

Molar mass = 58.5 g/mol

Van't Hoff factor = 2

1. calculate the number of moles

So we can calculate the molarity of the salt NaCl from the formula;

m = ΔTf / i Kf

m = 5 / 2 * 1.86

m = 5 / 3.72

m = 1.344 mol/kg

2. calculate the number of moles of the salt required

Next is to multiply the molarity by the mass of water. Density of water = 1kg/L

number of moles = 1.344 mol/kg * 1 Kg/L * 1 kg water

number of moles = 1.344 moles.

3. calculate the mass of the salt.

numner of moles = mass / molar mass

mass = number of moles * molar mass

mass = 1.344 * 58.5

mass = 78.624 g of NaCl salt.

You can follow these steps to solve for the type of salt you are given in the question.

6 0

4 years ago

Which color of visible light has the shortest wavelength?

Otrada [13]

Answer:

Hi! Your answer should be (C.) violet

Explanation:

Violet had the shortest wavelength, at around 380 nanometers. Red has the longest wavelength, at around 700 nanometers. Hope this helps!

8 0

3 years ago

Read 2 more answers

Hydrogen, a potential future fuel, can be produced from carbon (from coal) and steam by the following reaction: C(s)+2H2O(g)→2H2

madam [21]

The question is incomplete , complete question is:

Hydrogen, a potential future fuel, can be produced from carbon (from coal) and steam by the following reaction:

$C(s)+ 2 H_2O(g)\rightarrow 2H_2(g)+CO_2(g).\Delta H=?$

Note that the average bond energy for the breaking of a bond in CO2 is 799 kJ/mol. Use average bond energies to calculate ΔH of reaction for this reaction.

Answer:

The ΔH of the reaction is -626 kJ/mol.

Explanation:

$C(s)+ 2 H_2O(g)\rightarrow 2H_2(g)+CO_2(g).\Delta H=?$

We are given with:

$\Delta H_{H-O}=459 kJ/mol$