What is a percent volume of ethanol c2h60 in the final solution when 85 ml of it is diluted to a volume?

Heating devices can be made by passing an electric current through a conductor of:

olchik [2.2K]

Answer:

High resistance

Low conductivity

Explanation:

The more resistance (aka less conductivity) there is, the more the energy is turned into heat than simply passing through the object.

6 0

3 years ago

What type of soils are more likely to transmit contaminants

Sindrei [870]

Answer:

Chemicals can attach more easily to soils with a higher content of clay and organic matter. In addition, sandy soils generally do not contain a large amount of soil organisms compared with other soil types.

Explanation:

4 0

3 years ago

Read 2 more answers

3Fe + 4H2O Fe3O4 + 4H2

aalyn [17]

These are five questions with its five answers.


First, we have to explain main question.


The statement provides the chemical equation for the reaction of Fe with water to produce iron(III) oxide and hydrogen.


Fe3O4 is a weird chemical formula. It belongs to the product named oxoiron.


Next, I have to tell how you must interpret the question. The five questions are based on the complete reaction of the same number of moles as the coefficients indicated in the chemical equation.


Those coefficients are 3 for Fe, 4 for H₂O, 1 for Fe₃O₄ and 4 for H₂.

With that understood, let's work every question.

1) How many molecules of H₂ are produced?

Answer: 4 moles of molecules.

Justification:


This is, the number of moles of H₂ produced is given by the coefficient indicated in the chemical equation.


2) How many oxygen atoms are required?


Answer: 4.

This is, the atoms of oxygen are supplied in the molecules of water. Since the coeffcient of water is 4, and each molecule o fwater has 1 atom of oxygen, 4 moles of water contain 4 moles of atoms of oxygen.


3) How many moles of Fe₃O₄ are formed?


Answer: 1.


Justification: the coefficient of for formula Fe₃O₄ is 1, indicating that the theoretical yield is 1 mol of molecules.


4) What is the mole ratio of Fe to H₂O?


Answer: 3:4


Justification:


The ratio is the quotient of the two coefficients: the coefficient of the Fe divided by the coefficient of the H₂O.


5) How many hydrogen atoms are involved in this reaction?


Answer: 8 moles of hydrogen atoms.


Justification: as you can see each molecule of H₂O has 2 atoms of hydrogen, then 4 moles of molecules of H₂O have 8 moles of atoms of hydrogen. And of course the same number are in the produt: 4 moles of H₂ contain 8 moles of atomos of hydrogen

3 0

3 years ago

Read 2 more answers

F Calculate the pH of 1.00 X 10^-6 M HCI *

amid [387]

Explanation:

A.ph 6 B. correct ph goes in a scale up to 14 below 7 is acidic above 7 is basic and in the middle is newtral when they say pH they are asking how acidic is it when they ask for pOH they are asking how basic it is pH is calculated using logs as is pOH so ans

12.65

5 0

4 years ago

How many moles of oxygen are formed when 58.6 g of KNO3 decomposes according to the following reaction? 4 KNO3(s) → 2 K2O(s) + 2

Leya [2.2K]

Answer:

0.725 mol

Explanation:

Moles are calculated as the given mass divided by the molecular mass.

i.e. ,

moles = ( mass / molecular mass )

since,

mass of KNO₃ = 58.6 g ( given )

Molecular mass of KNO₃ = 101 g / mol

Therefore,

moles of KNO₃ = 58.6 g / 101 g / mol

moles of KNO₃ = 0.58 mol

From the balanced reaction ,

4 KNO₃ (s) ---> 2K₂O (s) + 2N₂ (g) + 5O₂ (g)

By the decomposition of 4 mol of KNO₃ , 5 mol of O₂ are formed ,

hence, unitary method is used as,

1 mol of KNO₃ gives 5 / 4 mol O₂

Therefore,

0.58 mol of KNO₃ , gives , 5 / 4 * 0.58 mol of O₂

Solving,

0.58 mol of KNO₃ , gives , 0.725 mol of O₂

Therefore,

58.6g of KNO₃ gives 0.725 mol of O₂.

3 0

3 years ago