Consider the reaction below. 2Al2O3 mc019-1.jpg 4Al + 3O2 How many moles of oxygen are produced if 11.0 mol of Al are produced?
Answers
Answer: 8.25 moles of oxygen are produced.
Explanation: The reaction follows:
By Stoichiometry,
As, 4 moles of Aluminium is produced by 2 moles of aluminium oxide
11 moles of aluminium will be produced by =
Now, 2 moles of aluminium oxide produces 3 moles of oxygen, so
5.5 moles of Aluminium oxide will produce =
Hence, 8.25 moles of oxygen will be produced.
4 moles Al ----------> 3 moles O₂
11.0 moles Al -------> ?
O₂ = 11.0 * 3 / 4
= 8.25 moles of O₂
hope this helps!
Related Questions
What is the correct way to represent 5600 L using scientific notation?–5.6 mc031-1.jpg 103 L –5.6 mc031-2.jpg 10–3 L 5.6 mc031-3.jpg 10–3 L 5.6 mc031-4.jpg 103 L
What are 3 signs that a chemical reaction is happening, what tells you that this is definitely a chemical reaction?
If 0.25 mol of Br2 and 0.55mol of Cl2 are introduced into a 3.0-L container at 400 K, what will be the equilibrium concentration of BrCl ?? Br2(g)+Cl2(g) 2BrCl at 400 K, Kc= 7.0
Chuck wants to know how many electrons in an atom are not paired up. Which model would be best for Chuck to writeout?a set of quantum numbers for the last electron in the atoma configuration with numbers, letters, and superscriptsa dot structure of the atoman orbital notation of the atom
b. are one of the major symptoms of depression
c. usually also lead to panic attacks
d. should be ignored even when they last a long period of time
Answers
A) Sadness can occur within anybody, not just a symptom of depression. This option is out of the question, since it is wrong.
B) Feelings of sadness are usually linked to depression when felt over a long period of time. Studies say that sadness is only a little part of depression, while you mostly feel rejected, hopeless, and worthless. Looking at the other options, this would be the most reasonable answer.
C) This CAN be true in some ways, but panic attacks can be triggered by so many things. The #1 reason is usually when you're nervous or anxious. Panic attacks can even happen out of the blue. Sadness can lead to panic attacks, but not usually. I would say no for this option.
D) Sadness should NOT be ignored when they last over a long period of time. If you are sad for a certain time period, you should look into talking to somebody about the issue. This option is obviously false.
Out of the choices, two out of four were reasonable, but I would have to go with B) are one of the major symptoms of depression.
Answers
I hope I helped! =D
(2) The nucleus is positive and the electron cloud is negative.
(3) The nucleus is negative and the electron cloud is positive.
(4) The nucleus is negative and the electron cloud is negative.
Answers
Atoms are made of nucleus and electrons. Nucleus have a positive charge due to the presence of protons and electrons are negative in charge . Thus option 2 is correct.
What is an atom?
Atoms are the basic unit every substance. Atoms combines to form molecules and compounds. An atom is made of nucleus and surrounding electrons which are revolving through a circular path of fixed energy.
Nucleus is the core of the atom and the 90% of the weight of atom is centered in the nucleus and it contains positively charged protons and neutral particles neutrons.
The nuclear model of atom was first proposed by Rutherford. He found the positive cloud of the atom and and named as nucleus. He discovered the positively charged particles protons.
The net charge of an atom is zero because all the positive charges are neutralised by equal number of negatively charged particles electrons.
Therefore, the nucleus is positive and the electron cloud is negative and option 2 is correct.
To find more about atomic nucleus, refer the link below:
#SPJ2
The electron cloud has a negative charge, because electrons have a -1 charge
So the answer is (2)
B. contain carbon, hydrogen, and oxygen respectively in a 1:2:1 ratio.
C. are produced by living organisms.
D. dissolve in water.
Answers
Final answer:
Organic molecules always contain carbon. They need not always be produced by living organisms and do not necessarily dissolve in water. Moreover, they are not restricted by the composition or ratio of other elements.
Explanation:
The answer to this question pertains to organic molecules. Organic molecules are a type of molecules that always contain carbon. This is represented by option A. This is not restricted by the presence of certain elements or the ratio in which they exist such as hydrogen and oxygen (1:2:1 ratio as mentioned in option B). The notion that organic molecules are produced only by living organisms (option C) is not entirely accurate either. Although they are predominantly found in and produced by living organisms, they can also be synthesized in a laboratory setup. Option D states that organic molecules always dissolve in water, which is not the case, as many organic compounds are
hydrophobic, meaning they repel or fail to mix with water. Therefore, the most accurate statement is A: organic molecules always contain carbon.
Learn more about Organic Molecules here:
#SPJ2
(1) C6H12O6 (3) CaCl2
(2) CH3OH (4) CCl4
Answers
During this reaction, the oxidation number of Fe changes from
(1) +2 to 0 as electrons are transferred
(2) +2 to 0 as protons are transferred
(3) +3 to 0 as electrons are transferred
(4) +3 to 0 as protons are transferred
Answers
let oxidation state of Fe = x
2x + (-2 * 3) = 0
2x - 6 = 0
2x = +6
x = +3
Oxidation state of Solid Iron
Fe
the rule is that the oxidation state of an uncombined element is zero
Redox pertains to electron transfer and not proton transfer thus your answer is OPTION 3 (+3 to 0 as electrons are transferred)