CHEMISTRY HIGH SCHOOL

Two or more atoms that have been chemically combined are
called a

Answers

Answer 1
Answer:

Answer:

compound

Explanation:

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Write your question here (Keep it simple and clear to get the best answer)how can the boiling point of a liquid raised without adding soluble impurities?

Answers

The boiling point of a liquid can be raised by adding pressure. Like wise, if you lower the pressure the boiling point goes down. This can be explained by the fact that boiling occurse when the vapor pressure equals the outside pressure so when the outside pressure rises the vapor pressure required for boiling also rises. Vapor pressure is proportional to temperature and therefore temperature needs to increase to make the vapor pressure increase. I hope this helps. Let me know in the comments if anything is unclear or if you want me to explain anything further.

Calculate the number of moles of Al2O3 that are produced when 0.60 mol of Fe is produced in the following reaction: 2Al(s)+3FeO(s) = 3Fe(s)+Al2O3(s)

Answers

 2 Al(s) + 3 FeO(s) = 3 Fe(s)+Al₂O₃(s)

3 moles Fe ------------> 1 mole Al₂O₃
0.60 moles Fe ------- > ?

moles Al₂O3 = 0.60 x 1 / 3

moles Al₂O₃ = 0.60 / 3

= 0.2 moles of Al₂O₃

hope this helps!

The number of mole of{\text{A}}{{\text{l}}_2}{{\text{O}}_{\text{3}}}produced is\boxed{{\text{0}}{\text{.20 mol}}}.

Further explanation:

A balanced chemical reaction is a chemical reaction that has equal number of atoms of the different elements in the reactant as well as on the product side. The chemical equation is required to be balanced to follow the Law of the conservation of mass.

Stoichiometry of a reaction is used to determine the number of species present in the reaction by the relationship between the reactants and products. It can be used to determine the moles of a compound when the moles of another compound in the reaction are given.

The general reaction is as follows:

{\text{A}}+2{\text{B}}\to3{\text{C}}

Here,

A and B are reactants.

C is the product.

One mole of Aand two moles of B react to form three moles of C. The stoichiometric ratio between A and B is 1:2, between A and C is 1:3 and between B and C is 2:3.

The given chemical reaction is as follows:

{\text{2\;Al}}\left({\text{s}}\right)\;+\;{\text{3\;FeO}}\left({\text{s}}\right)\to {\text{3\;Fe}}\left({\text{s}}\right)+{\text{A}}{{\text{l}}_2}{{\text{O}}_{\text{3}}}\left({\text{s}}\right)

According to the stoichiometry of the above-balanced chemical reaction, 2 moles of Al react with 3 moles of FeO to produce 3 moles of Fe and 1 mole of {\text{A}}{{\text{l}}_2}{{\text{O}}_{\text{3}}}.

Therefore, the ratio of the moles of Fe and {\text{A}}{{\text{l}}_2}{{\text{O}}_{\text{3}}}will be 3:1.

The formula to determine the number of moles of{\text{A}}{{\text{l}}_2}{{\text{O}}_{\text{3}}}is written as follows:

{\text{Number of moles }}\left({{\text{A}}{{\text{l}}_2}{{\text{O}}_{\text{3}}}} \right)=(1)/(3){\text{(number of moles of  Fe}})             …… (1)

Substitute 0.60 mol for number of moles of Fe in equation (1).

\begin{aligned}{\text{Number of moles}}\left({{\text{A}}{{\text{l}}_{\text{2}}}{{\text{O}}_{\text{3}}}}\right)&=\frac{{\text{1}}}{{\text{3}}}\left({{\text{0}}{\text{.60 mol}}}\right)\n&={\text{0}}{\text{.20 mol}}\n\end{aligned}

Hence, 0.20 mol of {\mathbf{A}}{{\mathbf{l}}_{\mathbf{2}}}{{\mathbf{O}}_{\mathbf{3}}}is produced when 0.60 mol of Fe is produced in the reaction.

Learn more:

1. Write the equation to show how cation acts as an acid brainly.com/question/2396649.

2. Which are the characteristics of mixtures brainly.com/question/1917079?

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Solutions

Keywords: Balanced chemical reaction, stoichiometry, reactants, products, number of moles, Fe, Al2O3, FeO and Al.

How many grams are there in 3.5 moles of H20

Answers

Molar mass H₂O = 18.0 g/mol

1 mol ----- 18.0 g 
3.5 moles --- ?

Mass ( H₂O) = 3.5 x 18.0 / 1

=> 63.0 g

hope this helps!

What is the energy change that will occur when 25.5 grams of oxygen gas (O2) react with excess methane (CH4) according to the reaction below? CH4 + 2 O2yields CO2 + 2 H2O delta H = -889 kJ/mol

Select one:
a. 354 kJ of energy will be given off by the reaction
b. 354 kJ of energy will be absorbed by the reaction
c. 708 kJ of energy will be given off by the reaction
d. 708 kJ of energy will be absorbed by the reaction

Answers

amount of CH4 is excess, so no need to worry about it 
but the limiting factor is the Oxygen 

according to stranded equation, 

CH4 + 2 O2 --> CO2 + 2 H2O ΔH = -889 kJ/mol 


just by taking proportions 

(-889 kJ/mol) / 2 x 0.8 mol = - 355.6 kJ 

so i think the answer is (a)

Which element in period 3 has both metallic and non metalik properties​

Answers

Answer:

Siis the answer I hope this help

Climatology is a subspecialty of

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Climatology is a subspecialty of a Climate and for how the climate changes. This is averaged out from over a set of a period of time.

I hope this helps! ;D
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