If you know chemistry please be so kind and take some time to help me with these 2 problems!! Marking brainliest!!
Answers
Our balanced equation is Cu + 2AgNO₃ → Cu(NO₃)₂ + 2Ag.
The coefficients of reactants tell us that 1 mole of Cu reacts per 2 moles of AgNO₃. We want to know the mass of Cu that will react with a mass (specifically, 420 g) of AgNO₃. To start, we must convert the mass of AgNO₃ to moles of AgNO₃:
Moles of AgNO₃ = Mass of AgNO₃ ÷ Molar Mass of AgNO₃
Moles of AgNO₃ = 420 g AgNO₃ ÷ 169.88 g AgNO₃/mol AgNO₃
Moles of AgNO₃ = 2.47 moles of AgNO₃.
Since only half as many moles of Cu is consumed in reacting with the AgNO₃, the number of moles of Cu that will react with 2.47 moles of AgNO₃ would be half of 2.47, or 1.24 moles of Cu.
Finally, we can convert the molar quantity of Cu to mass by multiplying the number of moles of Cu by the molar mass of Cu:
Mass of Cu = Moles of Cu × Molar Mass of Cu
Mass of Cu = 1.24 moles Cu × 63.546 g Cu/moles Cu
Mass of Cu = 78.6 g of Cu
So, 78.6 grams of Cu are needed to react with 420 g of AgNO₃.
---
The way to solve the second question is identical to how we solved the first question. The coefficient of Ag is 2, so the molar ratio between the Ag produced and Cu reacted is 2:1. In other words, half as many moles of Ag produced is equivalent to the number of moles of Cu that was consumed in the reaction.
So, as we did with the first question, we first convert the mass of the Ag produced to moles. The molar mass of Ag is 107.8682 g/mol. Dividing 98.5 g of Ag by the molar mass gives us 0.913 moles of Ag produced. The number of moles of Cu that reacted to produce 0.913 moles of Ag would be 0.913/2 = 0.457 moles of Cu.
Lastly, multiplying 0.457 moles of Cu by the molar mass of Cu, we obtain the mass of Cu (in grams) that reacted: 0.457 × 63.546 = 29.0 g of Cu.
So, 29.0 grams of Cu reacted to produce 98.5 grams of Ag.
Note: I have provided the answers for both questions to three significant figures; while 420 technically has only two significant figures, it would seem consistent to treat it as having three since 98.5 has three digits and three significant figures.
Related Questions
4) How many liters are needed for a 5.1 Molar solution containing 2.3 moles of NaCl?
moles =
Molarity =
Liters =
Answers
Need help on this question asap please
Answers
Answer:
The correct answer is - 14.
Explanation:
In the given molecular formula of the aluminum sulphite which is Al2(SO3)3, this molecular formula there different type of elements are bonded together to form this compound each element has a specific number of atoms present. This compound has three elements that are aluminum, sulfur, and oxygen and the atoms are present are:
Al = 2 atoms represented by subscript
S = 3 atoms represented as whole subscripts of sulfite
O = 9 atoms 3 inside bracket and 3 outside of bracket that multiplies.
Thus, total number of atoms are 2+3+9 = 14
According to periodic trends, at which position on the periodic table would
an element most likely have an electronegativity HIGHER than that of calcium?
Select ALL correct answers.
Answers
Answer:
Just to the right of calcium
Explanation:
Electronegativity increases as we go from left to right the periodic table
How many spirals does a DNA molecule have?
Answers
Answer:
two
Explanation:
2
Answer:
two
Explanation:
nucleic acids are made up of chains of many repeating units called nucleotides. the dna molecule consists of two such chains that spiral around an imaginary axis to form a double helix (spiral.)
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when Henry mosléy came up with he's own atomic number?
I WILL MARK AS BR*NLIST IF YOU CORRECT ANSWER
Answers
Answer:
1911 is when he made it
Explanation:
Moseley's law provided a reasonably complete experimental set of data that supported the (new from 1911) conception by Ernest Rutherford and Antonius van den Broek of the atom, with a positively charged nucleus surrounded by negatively charged electrons in which the atomic number is understood to be the exact physical number of positive charges (later discovered and called protons) in the central atomic nuclei of the elements.
If 3.91 moles of H2 were used, how many moles of NH3 would be made?
HELP PLEASE ASAP
Answers
N + H2 → NH3
balance the equation
2N + 3H2 → 2NH3
3H2 → 2NH3
3 : 2
3.91 ÷ 3 = 1.303 mol
1.3 × 2 = 2.606 mol
Which one of the following compounds is insoluble in water?
a) Na2CO3
b) K2SO4
c) Fe(NO3)3
d) ZnS
Answers
Answer:
The answer is Na2CO3.Option a
Do you
think that the Nitrogen cycle has a negative or positive
impact on the environment?
Answers
Answer:
Nitrogen, the most abundant element in our atmosphere, is crucial to life. Nitrogen is found in soils and plants, in the water we drink, and in the air, we breathe. It is also essential to life: a key building block of DNA, which determines our genetics, is essential to plant growth, and therefore necessary for the food we grow. But as with everything, balance is key: too little nitrogen and plants cannot thrive, leading to low crop yields; but too much nitrogen can be toxic to plants, and can also harm our environment. Plants that do not have enough nitrogen become yellowish and do not grow well and can have smaller flowers and fruits. Farmers can add nitrogen fertilizer to produce better crops, but too much can hurt plants and animals, and pollute our aquatic systems. Understanding the Nitrogen Cycle—how nitrogen moves from the atmosphere to earth, through soils, and back to the atmosphere in an endless Cycle—can help us grow healthy crops and protect our environment.
Explanation:
When calcium chloride is added to a sample of water, the boiling point will _________. A. increase B. decrease C. not change D. first decrease, then increase
Answers
Answer:
C
Explanation:
If you add salt to water, its boiling point increases.
When calcium chloride is added to a sample of water, the boiling point will increase. Option A is correct.
What is boiling point?The boiling point of the liquid is the temperature at which the vapor pressure of a given liquid equals the external pressure or atmospheric pressure surrounding the given liquid.
The calcium chloride is added to a sample of water it releases the some amount heat and become exothermic and the boiling point will increase due to the reaction of water and calcium chloride.
Therefore, when calcium chloride is added to a sample of water, the boiling point will increase. Option A is correct.
Learn more about boiling point, here:
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The image shows the mouth of a Tasmanian devil. The Tasmanian devil has four distinctive long teeth near the front of its mouth. Based on their shape, what are these teeth mostly like used for?
A.
holding and tearing meat
B.
crunching and crushing bone
C.
grinding up plant material
D.
rooting in soil for worms
Answers
Answer:
same as the answer of her
Explanation:
hshsjsjsjsjskwsksjsjjsjwwjsnsjsjwjkwis
How many atoms of hydrogen are in the compound 6(NH4)2CO3?
Answers
Height
O
Genetic
O Environmental
O Both
Answers
Answer:
its both because your hight can change if u do exercises
Hope it helped.
Ahhhh someone help me with this
Answers
Answer:
3.6g
Explanation:
2 moles of water gives 1 mole of oxygen
2(h2o)=1(o2)
2(molar mass of h2o)=1(molar mass of oxygen molecule)
2(18)=1(16×2)
36=32
3.6=x
cross multiply
3.6×32=36× x
115.2=36x
x=115.2÷36
x=3.6g
What happens during high tide?
a.The tidal range is at its minimum in a location.
b.The tidal range is at its maximum in a location.
c.The water level in the ocean rises to above average water level.
D.The water level in the ocean drops to below average water level.
Answers
Answer: c
Explanation:
Changes in the total amount of thermal energy provide evidence that chemical reactions have taken place. A chemical reaction in which energy has been absorbed is known as a(n):
Select one:
physical reaction.
endothermic reaction.
reversible reaction.
exothermic reaction.
Answers
Answer:
B. endothermic reaction
Explanation:
21. The formation of an ionic bond involves the a transfer of electrons. b. transfer of neutrons. c. transfer of protons. d. sharing of electrons.
Answers
Answer:
I think its C but if its not try A then
Explanation:
2.00g of Copper wire was added to 50.0 mL of a 0.050M solution of Silver Nitrate. The reaction
produced solid silver and aqueous copper II Nitrate. The silver precipitate was collected and
dried. It was determined that the mass of the silver precipitate was 0.24 g. Use this information
to determine the theoretical yield, limiting reactant, and percent yield.
Answers
Answer:
See explanation
Explanation:
Now, the equation of the reaction is;
Cu(s) + 2AgNO3(aq) --------> Cu(NO3)3 (aq) + 2Ag(s)
Number of moles of silver precipitate = 0.24/108 g/mol= 0.0022 moles
Number of moles of AgNO3 = 50/1000 * 0.050 = 0.0025 Moles
If 2 moles of AgNO3 yields 2 moles of Ag
Then 0.0025 moles of AgNO3 yields 0.0025 * 2/2 = 0.0025 moles of Ag
Number of moles of Cu = 2.00g/63.5 g/mol = 0.03 moles
If 1 mole of Cu yields 2 moles of Ag
0.03 moles of Cu yields 0.03 moles * 2/1 = 0.06 moles of Ag
Hence AgNO3 is the limiting reactant
Theoretical yield of Ag = 0.0025 moles of Ag * 108 = 0.27 g
Actual yield of Ag = 0.24 g
Percent yield = actual yield/theoretical yield * 100
Percent yield = 0.24/0.27 * 100
Percent yield = 88.8%
The measured pOH of a solution is 5.5. What is the hydrogen ion, [H+ ],
concentration?
Answers
First, calculate pH using the pOH:
14 - pOH = pH --> pH = 14 - 5.5 = 9.5
[H+] = 10^-pH = 10^-9.5 = 3.2 x 10^-10 M ≈ 3 x 10^-10 M (The answer should technically only be one sig fig, since the pOH is given to only one decimal place).
How do you find how many electrons are in a atom?
Answers
Answer:
To determine how many total electrons there are, add the amount of charge to the atomic number. In this case, there are fewer protons than electrons. For example, N 3- has a -3 charge which means it has 3 more electrons than a neutral nitrogen atom. Nitrogen’s atomic number is 7, therefore this ion has 10 electrons.
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Explanation:
A star's mass determines the A.length of its lifecycle b.location of the star c.galaxy it belongs to. D.shape of the star
Answers
Answer:
A.length of its lifecycle
Explanation:
A star will go through evolutionary stages depending on their initial mass. These stages are determined by the internal structure of the star and how it produces energy. Therefore, scientists may use the HR diagram to determine the length of the stars lifecycle depending upon its initial mass.
What is the scientific method? *
a. A series of steps used by scientists to investigate an hypothesis
b. A series of steps used to determine which chemicals are good for use
c. A series of steps used to tell how life began on earth
d. A series of steps used to by scientists to find about technology
Answers
The temperature of a sample of gas in a steel tank at 60.0 kPa is increased from -105.0°C to 26.0
*C. What is the final pressure inside the tank?*
(
Answers
Answer:
106.785 kPa, I believe this is correct!
Explanation:
1, 2, or 3...help please
Answers
Answer:
molecular so number 3. ...
PLZZZ HELP ME WITH THIS
Answers
Answer:
1) The mole ratio of KClO₃ to 3O₂ is 2:3
The reciprocal of the mole ratio of KClO₃ to 3O₂ is 3:2
2) The mole ratio of K to NaNO₃ is 1:1
The reciprocal of the mole ratio of K to NaNO₃ is 1:1
Explanation:
The mole ratio (also known as mole-mole ratio) of two compounds involved in a chemical reaction, is the ratio of the number of moles of the compounds in the reaction which can be obtained from the coefficients of the compounds in the balanced chemical reaction
The mole ratio of compound A to compound B = A:B = A/B
1)The given chemical reaction can be expressed as follows;
2KClO₃ → 2KCl + 3O₂
Therefore;
[tex]The \ mole \ ratio \ of \ KClO_3 \ to \ O_2 = \dfrac{2 \ moles \ of \ KClO_3}{3 \ moles \ of \ O_2} = \dfrac{2}{3} = 2:3[/tex]
[tex]The \ reciprocal \ of \ the \ mole \ ratio \ of \ KClO_3 \ to \ O_2 = \dfrac{3 \ moles \ of \ O_2}{2 \ moles \ of \ KClO_3} = \dfrac{3}{2} = 3:2[/tex]
2) In the reaction NaNO₃ + K → Na + KNO₃
The mole ratio of K to NaNO₃ = 1:1
Therefore;
The reciprocal of the mole ratio of K to NaNO₃ = 1:1
2. A chef fills a 100 ml container with a 83.5 g of cooking oil.
What is the density of the oil?
Answers
Density (ρ) = 835 kilogram/cubic meter
Steps:
ρ =
m
V
=
83.5 gram
100 milliliter
= 0.835 gram/milliliter
= 835 kilogram/cubic meter
Which traits does the common garter snake have that might be adaptive for the environment where it lives?
Answers
Answer:
As the garter snake can be found almost in any kind of habitat, what makes them be able to survive in any environment include:
1. They hibernate to increase their chances of survival in unfavorable weather conditions.
2. They can blend with the background of any environment especially grass to escape being eaten.
3. They produce an odor that is usually unpleasant especially when about to be attacked.
Explanation:
The garter snakes are distinguished by the three stripes running the length of their body and can often be found in forests, places that are even close to water bodies, and almost any place, even in holes.
Answer:
Because it'll live in the desert!
Explanation:
It probably won't survive on time!
help please see attached file
Answers
Answer:
balanced equation of glucose
6CO2 + 6H2O----------C6H12O6 + 6O2
in the presence of sun light.
give an example of how an organism can use surface tension?
Answers
Answer:Insects, such as water striders, and spiders, such as fisher spiders, can glide or scamper across the surface of water. These critters are small enough that their weight can be supported almost entirely by surface tension, the relatively weak forces that hold water molecules together.
Explanation:
Answer:
Examples of surface tension Water striders are able to walk on top of water due to a combination of several factors. Water striders use the high surface tension of water and long, hydrophobic legs to help them stay above water. Water striders use this surface tension to their advantage through their highly adapted legs and distributed weight.
Explanation:
pls mark brainliest
Volcanic eruptions can be very dangerous for nearby human and animal populations. One danger is that lava and ash may bury habitats. What is another danger during a volcanic eruption?
A.
Lava or hot debris may start fires.
B.
Lava flows may cause tsunamis.
C.
Volcanic eruptions always cause flooding.
D.
Volcanic eruptions always cause high winds.
Answers
Answer:
B. Lava flows may cause tsunamis.
Balance the following equation
C₂H₆O + O₂ → CO₂ + H₂O
Answers
Answer:
C2H6O + 3O2 - > 2CO2 + 3H20