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3 years ago

Calculate the number of moles 230 g of C2H5OH 560 g of C2H4 0.640 g of SO2

1 answer:

6 0

Mass of C = 12g
mass of H = 1g
mass of O = 16g
mass of C2H5OH = 46g = 1 mole

1 mole of C2H5OH ------------ 46g
x moles of C2H5OH ----------- 230g
x = 5 moles of C2H5OH

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mass of C = 12g
mass of H = 1g
mass of C2H4 = 28g = 1 mole

1 mole of C2H4 -------------- 28g
x moles of C2H4 ------------- 560g
x = 20 moles of C2H4
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mass of S = 32g
mass of O = 16g
mass of SO2 = 64g = 1 mole

1 mole of SO2--------------------- 64g
x mole of SO2 -------------------- 0,64g
x = 0,01 moles of SO2

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If we mix 25 grams of sodium bromide with a large amount of potassium chloride, what will our theoretical yield of sodium chlori

erik [133]

Answer:

Theoretical yield of sodium chloride = 14.04 g

Explanation:

Given data:

Mass of sodium bromide = 25 g

Theoretical yield of sodium chloride = ?

Solution:

Chemical equation:

NaBr + KCl → NaCl + KBr

Number of moles sodium bromide:

Number of moles = Mass /molar mass

Number of moles = 25.0 g / 102.9 g/mol

Number of moles = 0.24 mol

Now we will compare the moles of NaCl with NaBr .

NaBr : NaCl

1 : 1

0.24 : 0.24

Theoretical yield of sodium chloride:

Mass = moles × molar mass

Mass = 0.24 mol × 58.5 g/mol

Mass = 14.04 g

7 0

3 years ago

16. Which of the following aqueous solutions contains the greatest number of 10ns.

gavmur [86]

Answer:

$\boxed{\text{b) 300.0 mL of 0.10 mol/L CaCl}_{2}}$

Explanation:

a) 400.0 mL of 0.10 M NaCl

(i) Moles of NaCl

$\text{ Moles of NaCl } = \text{0.4000 L NaCl} \times \dfrac{\text{0.10 mol NaCl}}{\text{1 L NaCl}} = \text{0.040 mol NaCl}$

(ii) Moles of ions

NaCl(s) ⟶ Na⁺(aq) + Cl⁻(aq)

We get 2 mol of ions from 1 mol of NaCl

$\text{Moles of ions } = \text{0.040 mol NaCl} \times \dfrac{\text{2 mol ions}}{\text{1 mol NaCl}} = \text{0.080 mol ions}$

b) 300.0 mL of 0.10 M CaCl₂

(i) Moles of CaCl₂

$\text{ Moles of CaCl}_{2} =\text{0.3000 L CaCl}_{2} \times \dfrac{\text{0.10 mol CaCl}_{2}}{\text{1 L CaCl}_{2}} = \text{0.030 mol CaCl}_{2}$

(ii) Moles of ions

CaCl₂(s) ⟶ Ca²⁺(aq) + 2Cl⁻(aq)

We get 3 mol of ions from 1 mol of CaCl₂

$\text{Moles of ions } = \text{0.030 mol CaCl}_{2} \times \dfrac{\text{3 mol ions}}{\text{1 mol CaCl}_{2}} = \text{0.090 mol ions}$

c) 200.0 mL of 0.10 M FeCl₃

(i) Moles of FeCl₃

$\text{ Moles of FeCl}_{3} =\text{0.2000 L FeCl}_{3} \times \dfrac{\text{0.10 mol FeCl}_{3}}{\text{1 L FeCl}_{3}} = \text{0.020 mol FeCl}_{3}$

(ii) Moles of ions

FeCl₂(s) ⟶Fe³⁺(aq) + 3Cl⁻(aq)

We get 4 mol of ions from 1 mol of FeCl₃

$\text{ Moles of FeCl}_{3} =\text{0.2000 L FeCl}_{3} \times \dfrac{\text{0.10 mol FeCl}_{3}}{\text{1 L FeCl}_{3}} = \text{0.020 mol FeCl}_{3}$

d) 200.0 mL of 0.10 M KBr

(i) Moles of KBr

$\text{ Moles of KBr} = \text{0.2000 L KBr} \times \dfrac{\text{0.10 mol KBr }}{\text{1 L KBr}} = \text{0.020 mol KBr}$

(ii) Moles of ions

KBr(s) ⟶ K⁺(aq) + Br⁻

We get 2 mol of ions from 1 mol of KBr

$\text{Moles of ions } = \text{0.020 mol KBr} \times \dfrac{\text{2 mol ions}}{\text{1 mol KBr}} = \text{0.040 mol ions}\\\\\text{We get the most ions ions from }\boxed{\textbf{300.0 mL of 0.10 mol/L CaCl}_{2}}$

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3 years ago

Which statement gives the main idea of the kinetic theory of heat?

seraphim [82]

Answer:

The best option is "Heat is transferred by the interaction of moving particles."

Explanation:

The Kinetic Molecular Theory of Heat states that molecules in a fluid increase their speed as temperature increases.

Kinetic theory of heat is a theory that the temperature of a body is determined by the average kinetic energy of its particles and that an inflow of heat increases this energy.

Heat and temperature are related to each other, but are different concepts.

1. Heat is the total energy of molecular motion in a substance while temperature is a measure of the average energy of molecular motion in a substance.

2. Temperature does not depend on the size or type of object.

Also heat can be transferred but temperature can't be transferred.

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2 years ago

How does silicon shape our technological reality?

Georgia [21]

Silicon is the most common element used in electronic devices. They are commonly termed as silicon wafers when incorporated into these electronics. Its beneficial property for this use is being a semi-conductor. It can be combined with other conductors through a process called doping, to make it ideal for making transistors that could amplify electric signals.

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3 years ago

The electron dot symbol for chlorine has the symbol Cl

Novosadov [1.4K]

Answer:

The correct option is 9

Explanation:

The number of dots in the electron dot symbol for chlorine = 7

The arrangement are 2 each on three of the for sides and one dot on the forth side

Therefore, given that the electronic configuration of the different orbital levels are;

1st = 1s²

2nd = 2s²2P⁶

The element that will have 7 electrons in the outermost shell similar to that of chlorine will have an electronic configuration as follows;

1s²2s²2P⁵, such that there are a total of 9 electrons (2 + 2 + 5 = 9) with 7 of the electrons in the outermost shell and 7 dots surrounding the element's symbol

However, since the for the atom to be electronically neutral, there are equal number of electrons and protons in the atom and given that the atomic number = The number of protons in the nucleus of the atom, we have that the atom having 7 dots surrounding its symbol similar to chlorine, Cl, has an atomic number of 9.

8 0

3 years ago