!PLEASE HELP ASAP!
How many grams of aluminum can be produced by decomposing 12.3 grams of aluminum
oxide?
if the percentage yield of a reaction is 85%
Answer: % yield
=
actual yield
theoretical yield
⋅
100
%
So, let's say you want to do an experiment in the lab. You want to measure how much water is produced when 12.0 g of glucose (
C
6
H
12
O
6
) is burned with enough oxygen.
C
6
H
12
O
6
+
6
O
2
→
6
C
O
2
+
6
H
2
O
Since you have a
1
:
6
mole ratio between glucose and water, you can determine how much water you would get by
12.0
g glucose
⋅
1 mole glucose
180.0 g
⋅
6 moles of water
1 mole glucose
⋅
18.0 g
1 mole water
=
7.20
g
This represents your theoretical yield. If the percent yield is 100%, the actual yield will be equal to the theoretical yield. However, after you do the experiment you discover that only 6.50 g of water were produced.
Since less than what was calculated was actually produced, it means that the reaction's percent yield must be smaller than 100%. This is confirmed by
% yield
=
6.50 g
7.20 g
⋅
100
%
=
90.3
%
You can backtrack from here and find out how much glucose reacted
65.0 g of water
⋅
1 mole
18.0 g
⋅
1 mole glucose
6 moles water
⋅
180.0 g
1 mole glucose
=
10.8
g
Explanation:
Answer:no answer,
Explanation: but if the other dude see this can you re word Wht u said it’s hard to make sense of it
how many atoms are in the following:
2CH4
10Mg(OH)2
5Al2(SO4)3
3 H2O
Answer:
2CH4= 2+8 = 10 atoms
10Mg(OH)2 = 5 atoms
5Al2(SO4)3 = 85 atoms
3 H2O = 9 atoms
Explanation:
If you were going to draw a Lewis model of magnesium, how many valence electron dots would you do?
what is the molar mass of ammonium sulfite
Answer: 116.15 g/mol
Liquid octane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 1.1 g of octane is mixed with 1.04 g of oxygen. Calculate the maximum mass of carbon dioxide that could be produced by the chemical reaction. Round your answer to significant digits.
can Someone help me with this
Answer:
1. Mg²⁺ 2. Cl⁻ 3. PO₄³⁻
Explanation:
Answer:
1. Mg²⁺
2. Cl⁻
3. PO₄³⁻
Explanation:
Feel free to give brainliest.
Have a great day!
Acid rain is a type of pollution caused mainly from
fertilizer use
high concentrations of nitric and sulfuric acid from pollution
use of pesticides
CFC's
с
d
Answer:
im pretty sure its the second one
Which is bigger an atom or a cell?
Answer:
Both are small
Explanation:
Atom comprises to die molecules, and cell comprise to for tissues
Jocelyn and her friends put some raisins, hazelnuts,
almonds, and peanuts in a bowl to make a snack for their
hiking trip. What does this snack represent?
A. a solution
B. a new element
C. a new compound
D. a mixture
plspslsspslpsl help its revision for exam and i need it quick brainliest for the right answer :D
Answer: D. a mixture
Explanation: When you mix different types of nuts or snacks together including raisins, hazelnuts, almonds, and peanuts to make some kind of trail mix, then you are creating a mixture, specifically a heterogeneous mixture.
What occurred during Rutherford’s experiment that led to his discovery of the nucleus?
Answer:
Thomson's plum pudding model of the atom had negatively-charged electrons embedded within a positively-charged "soup." Rutherford's gold foil experiment showed that the atom is mostly empty space with a tiny, dense, positively-charged nucleus. Based on these results, Rutherford proposed the nuclear model of the atom.
Explanation:
What period has the highest ionization energy?
Answer:helium or the noble gases
Explanation: The ionization energy decreases from top to bottom in groups, and increases from left to right across a period. Thus, helium has the largest ionizing energy
Which is the correct orbital diagram for carbon?
ОА.
1s
2s
2p
OB.
1s
2s
2p
112 1
2p
Ос.
1s
2s
OD.
1s
2s
2p
11
The modern periodic table consists of the elements which are arranged in the increasing order of their atomic numbers. The element 'C' belongs to 14th group of the periodic table. The correct option is A.
What is orbital diagram?The orbital diagrams are the pictorial representation of the electrons in an atom. The orbital diagrams are mainly based on the Auf Bau principle, Pauli's exclusion principle and Hund's rule of maximum multiplicity.
According to Auf Bau principle, the electrons are arranged in the orbitals in the increasing order of their energies. The pauli's exclusion principle states that no two electrons in an atom can have the same set of four quantum numbers.
The hund's rule states that the unpaired electrons in the orbitals have parallel spins. The atomic number of 'C' is 6, and its electronic configuration is 1s²2s²2p².
Thus the correct option is A.
To know more about orbital diagrams, visit;
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omg can somebody please help me with these 2 questions
Answer: Q4=1 Q5=2
Explanation:
Best of luck.
Answer:
4. '4' "pathogens can interfere with normal life functions."
5. '2' "synthesizing antibodies that mark these organisms to be destroyed."
Explanation:
Is salt and water a solution? Give a reason for your answer.
Answer:
yes
Explanation:
as the salt is a polar compound which means that its dissolvable in water
so the salt would be solute and the water is the solvent
A sealed 10.0 L flask at 400 K contains equimolar amounts of ethane and propanol in gaseous form. Which of the following statements concerning the average molecular speed of ethane and propanol is true?
(A) The average molecular speed of ethane is less than the average molecular speed of propanol.
(B) The average molecular speed of ethane is greater than the average molecular speed of propanol.
(C) The average molecular speed of ethane is equal to the average molecular speed of propanol.
(D) The average molecular speeds of ethane and propanol cannot be compared without knowing the total pressure of the gas mixture.
Answer:
Im a 100% sure it is B. average molecular speed of ethane is greater than the average molecular speed of propanol.
Explanation:
Sry I didnt' get the explaination from my teacher.
According to the Kinetic theory of gases, the average speed of all gases at the same temperature will be in the same range. Hence, option C is correct.
What is kinetic theory of gases ?Kinetic theory of gases states the properties and composition of gases at a temperature and pressure. According to this theory, gaseous substances are made of tiny particles which are free to move and collide to each other.
The kinetic energy of the particles is directly proportional to the temperature. Hence, as the temperature increases, the kinetic energy increases and their average molecular speed increases.
At the same temperature, all the gases have equal range of average molecular speed irrespective of their molecular weight. Hence, at 400 K the average molecular speed of ethane and propanol will be the same.
Find more on kinetic theory :
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Plz help it's due soon. Calculate the energy and frequency of red light having a wavelength of 6.55 x 10⁻7m.
Answer:
E = 3.035× 10-¹⁹J = 1.9eV
f = 4.58 × 10¹⁴Hz
Explanation:
wavelength = 6.55 × 10-⁷m
c = 3 × 10⁸m/s
f = ?
E = ?
a) f = c/wavelength
f = 3 × 10⁸/6.55 × 10-⁷
f = 4.58 × 10¹⁴Hz
b) E = hc/wavelength
E = 6.626×10-³⁴ × 3 × 10⁸/ 6.55 × 10-⁷
E = 3.035 × 10-¹⁹J
1ev = 1.6 × 10-¹⁹J
Therefore E = 3.035/1.6 = 1.9eV
Hope it's not too late man
What volume of 18.5 M nitric acid would be needed to make 25.0 mL of 3.0M?
Answer:What volume of 9.00 M nitric acid is needed to make 6.50 L of 1.25 M solution? 903 mL What molarity should the stock solution be if you want to dilute 25.0 mL to 2.00 L and have the final concentration be 0.103 M?
Explanation:
When electricity is produced from coal the chemical energy in coal is changed to ___ energy
Answer: electrical energy
Explanation:
According to law of conservation of energy, energy remains conserved. It only transforms from one form to another.
Chemical energy is the energy stored in the bonds of molecules.
Electrical energy is the energy possessed by a body by virtue of movement of electrons.
Thus when When electricity is produced from coal the chemical energy in coal is changed to electrical energy
PLEASE HELPPPPP :(
Megan likes to take hot showers before she goes to bed. She makes sure that the temperature of the water is warm enough to create steam. When she gets out of the shower, she has to wipe the mirror because there is so much water on it. Which statement best describes why there is water on the mirror?
A. The steam collected on the mirror and got cooler, causing it to condense into water droplets.
B. The steam collected on the mirror and got warmer, causing it to condense into water droplets.
C. The steam collected on the mirror and then boiled, leaving behind water droplets.
D. The steam collected on the mirror and then evaporated, leaving behind water droplets.
Answer:
A
Explanation:
What might happen to the cryosphere if the insulating effect of the atmosphere increased?
Answer:
Acting like a highly reflective blanket, the cryosphere protects Earth from getting too warm. Snow and ice reflect more sunlight than open water or bare ground. Changes in snow and ice cover affect air temperatures, sea levels, ocean currents, and storm patterns all over the world.
Explanation: Hope this answers your question
Iridium has two naturally occurring isotopes, Iridium-191 and Iridium-193. If the average atomic mass of orodum s 192.217, what are the average percent abundances of each isotope?
Answer:
The percent isotopic abundance of Ir-193 is 60.85 %
The percent isotopic abundance of Ir-191 is 39.15 %
Explanation:
we know there are two naturally occurring isotopes of iridium, Ir-191 and Ir-193
First of all we will set the fraction for both isotopes
X for the isotopes having mass 193
1-x for isotopes having mass 191
The average atomic mass is 192.217
we will use the following equation,
193x + 191(1-x) = 192.217
193x + 191 - 191x = 192.217
193x- 191x = 192.217 - 191
2x = 1.217
x= 1.217/2
x= 0.6085
0.6085 × 100 = 60.85 %
60.85% is abundance of Ir-193 because we solve the fraction x.
now we will calculate the abundance of Ir-191.
(1-x)
1-0.6085 =0.3915
0.3915× 100= 39.15 %
Photosynthesis uses all of the following except___to make food.
A) Carbon dioxide
B) Chemical energy
C) Light energy
D) Water
Answer:
A
Explanation:
thanks me hehe lovelots
Plants contain three types of tissue. Describe the function of each. What are the tissues made of?
Each plant organ (roots, stems, leaves) contains all three tissue types: ... Vascular tissue is made of two specialized conducting tissues: xylem and phloem. Xylem tissue transports water and nutrients from the roots to different parts of the plant, and also plays a role in structural support in the stem
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Which of the following is an example of a chemical change?
A. Sugar Dissolving
B. Eggs frying
C. Ice melting
D. Flour and salt being mixed together
Answer:
Eggs Frying
Explanation:
;)
what is an autograph that transfers energy from the sun to make its own food?
Answer:
Photoautotrophs
Explanation:
I think you mean "autotroph"
The answer is photoautotrophs. they use sunlight to make their food
Don't forget to rate the answer for others
how many single covalent bonds does beryllium form in BeCl2?
Answer:
what I'm not really understand this question
Which refers specifically to a solution with as much dissolved solute as it can hold at a given temperature?
supersaturated
saturated
heterogeneous
homogeneous
Please and fast
Answer:
Saturated is the answer you are looking for
Explanation:
This is saturated's meaning: holding as much water or moisture as can be absorbed; thoroughly soaked.
"a mass of saturated air decreases in temperature as it rises in the atmosphere" Hence why the answer is saturated! :)
Hope this helps! :)
Answer: Saturated
Explanation: On Edge!!!!!!!!!!!!!
Explain the
purpose
of the heat exchanger in the nuclear power plant.
Answer:
yeah someone explain
Explanation:
tttttttttt%ttttttt
Answer:
A heat exchanger is device which is designed to transfer heat from one matter to another. In nuclear power plants, these heat exchangers are used to pass heat from primary system to the secondary system. In the process they produce steam from water, they are also called steam generators or pressurized water reactors.
1.5 mol of the complex substance carbon dioxide (CO2) is just a few oxygen atoms:
Answer:
9.03 x 10²³atoms
Explanation:
Given parameters:
Number of moles of CO₂ = 1.5mol
Unknown:
Number of atoms = ?
Solution:
In a mole of a substance, we have the Avogadro's number of particles which is 6.02 x 10²³atoms.
Using this number, we can determine the amount of atoms in any substance.
If;
1 mole of CO₂ contains 6.02 x 10²³ atoms;
1.5mole of CO₂ will contain 1.5 x 6.02 x 10²³ atoms
= 9.03 x 10²³atoms