How many grams of zinc chloride will be produced from 55. grams of zinc assuming hydrochloric acid is available in excess
Answer:
Mass = 114.5 g
Explanation:
Given data:
Mass of zinc = 55 g
Mass of ZnCl₂ produced = ?
Solution:
Chemical equation:
Zn + 2HCl → ZnCl₂ + H₂
Number of moles of Zn:
Number of moles = mass/molar mass
Molar mass of Zn = 65.4 g/mol
Number of moles = 55 g/ 65.4 g/mol
Number of moles = 0.84 mol
Now we will compare the moles of Zn and zinc chloride,
Zn : ZnCl₂
1 : 1
0.84 : 0.84
Mass of ZnCl₂:
Mass = number of moles × molar mass
Molar mass of ZnCl₂= 136.3 g/mol
Mass = 0.84 mol × 136.3 g/mol
Mass = 114.5 g
Apollo 11 made a ______ landing.
Answer:
Apollo 11 made a capsule landing
Explanation:
Answer: i don’t know what type of landing you mean
Explanation:
They did a lunar landing then reentry and then capsule landing.
What three traits are used to classify organisms
hope this answer helps and have a good day
How the lead (II) carbonate can be separated and collected from the product mixture with ammonium nitrate?
Answer:
fgedhwkmgfvhcdnxj
Explanation:
gtryijdohuygfvbhgfy
Can someone help
Me out pls if your good at chemistry
- Is energy absorbed or released by a material during the phase change from a solid to a liquid?
A)Absorbed
B)Released
Answer:
A) Abosrbed
Explanation:
The change is endothermic, meaning the material absorbs energy when it changes its phase from a solid to a liqiud.
Covalent bonds involve the sharing of?
Answer:
A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.
Explanation:
I hope this helps
Sally is building a list of the types of matter that have energy. She includes liquids on her list because she can see that liquids flow. Is her list complete?
a. yes, her list with just liquids on it is complete
b. no, she should add only gases to her list
c. no, she should add only solids to her list
d. no, she should add gases and solids to her list
Answer:
I just looked up the types of matter energy has.
Explanation:
I believe the answer is D.
Sally's list of matter that have energy is not complete as all the types of matter have energy as all matter have mass , and mass and energy are related, so she should have added gases and solids to her list.
What is matter?Matter in chemistry, is defined as any kind of substance that has mass and occupies space that means it has volume .Matter is composed up of atoms which may or not be of the same type.
Atoms are further made up of sub atomic particles which are the protons ,neutrons and the electrons .The matter can exist in various states such as solids, liquids and gases depending on the conditions of temperature and pressure.
The states of matter are inter convertible into each other by changing the parameters of temperature and pressure.
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I traveled for 0.5 hr at 80 km/h. How far did I travel?
Answer:
[tex]Distance = 40km[/tex]
Explanation:
Given
[tex]Speed = 80km/hr[/tex]
[tex]Time = 0.5hr[/tex]
Required
Determine the distance covered
Distance is calculated as:
[tex]Distance = Speed * Time[/tex]
Substitute values for Speed and Time
[tex]Distance = 80km/hr * 0.5hr[/tex]
[tex]Distance = 80km * 0.5[/tex]
[tex]Distance = 40km[/tex]
Hence, you travelled 40km
A sample of carbon dioxide gas at a pressure of 891 mm Hg and a temperature of 84 C occupies a volume of 5.61 L. If the gas is cooled at constant pressure to a temperature of 40 C, the volume of the gas will be __ L.
Answer:
4.92L
Explanation:
Given parameters:
Initial pressure = 891mmHg
Initial temperature = 84°C = 84 + 273 = 357k
Initial volume = 5.61L
New temperature = 40°C = 273 + 40 = 313k
Unknown:
New volume = ?
Solution:
Since we are dealing with constant pressure condition, we apply charles's law.
It states that the volume of a fixed mass of gas varies directly as its absolute temperature if the pressure is constant.
Mathematically ;
[tex]\frac{V1}{T1}[/tex] = [tex]\frac{V2}{T2}[/tex]
V1 is the initial volume V2 is the new volume
T1 is the initial temperature T2 is the new temperature
[tex]\frac{5.61}{357}[/tex] = [tex]\frac{V2}{313}[/tex]
V2 = 4.92L
A sample of methane gas collcted t a pressure of 0.0884 atm and a temperature of 6.00 C is found to occupy a volume of 26.5 L. How many moles of CH4 gas are in the sample? ____ mol
Answer:
0.1mole
Explanation:
Given parameters:
Pressure = 0.0884atm
Temperature = 6°C = 6 + 273 = 279K
Volume occupied = 26.5L
Unknown:
Number of moles = ?
Solution:
To solve this problem, we are going to use the ideal gas equation:
PV = nRT
P is the pressure
V is the volume
n is the number of moles
R is the gas constant = 0.082atmLmol⁻¹k⁻¹
T is the temperature.
Insert the parameters and solve for n;
0.084 x 26.5 = n x 0.082 x 279
n = 0.1mole
What is a disadvantage of geothermal energy
Answer:
it runs the risk of triggering earthquakes. releases harmful gases
How many particles are in 3.2 mole of neon gas
There are 1.93 x 10²⁴ particles
Further explanationGiven
3.2 moles of Neon gas
Required
Number of particles
Solution
The mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
So the number of particles for 3.2 moles :
N = 3.2 x 6.02.10²³
N = 1.93 x 10²⁴
or
we can describe it using Avogadro's number conversion factor
[tex]\tt 3.2~moles\times \dfrac{6.02\times 10^{23}}{1~mole}=1.93\times 10^{24}[/tex]
Is luster a chemical or physical change? (Worth 50 POINTS!)
Answer:
It is a Physical change, have a great day :)
Explanation:
A chemical change is a permanent change. A Physical change affects only physical properties i.e. shape, size, etc. ... Some examples of physical change are freezing of water, melting of wax, boiling of water, etc. A few examples of chemical change are digestion of food, burning of coal, rusting, etc.
What is water (H2O)? Select all that apply * an element a molecule 1 hydrogen and 2 oxygen 2 hydrogen and 1 oxygen
Answer:
2 hydrogen and 1 oxygen
Explanation:
H2O
Hydrogen has the coefficient so you multiply 1 by 2 and it equals 2
Oxygen does not have any sub or coe so its automatically 1
How many grams of K2Cr2O7, are soluble in 100 g of
water at 95 °C?
Answer:
75 grams
Explanation:
At 95 °C, you can dissolve up to 75 grams of K2Cr2O7 in 100 mL of water.
What is solubility?The solubility of a substance in a particular solvent is the maximum amount of that substance that can dissolve in the solvent at a given temperature. The solubility of a substance can be affected by factors such as temperature, pressure, and the presence of other substances.
For K2Cr2O7, the solubility in water is highly dependent on temperature. At 95 °C, the solubility of K2Cr2O7 in water is approximately 75 g/100 mL. This means that at 95 °C, you can dissolve up to 75 grams of K2Cr2O7 in 100 mL of water. Since 100 g of water is equivalent to 100 mL, you can dissolve up to 75 grams of K2Cr2O7 in 100 g of water at 95 °C.
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CAN SOMEBODY PLEASE HELP ME ANSWER THIS CORRECTLY?! (There’s only one option per term, I just really need help and I would appreciate it)
~TERMS~
1. Theory
2. Controlled
3. Variables
4. Hypothesis
5. Independent
6. Quantitative
~DEFINITIONS~
A.) a variable that stays the same during an experiment.
B.) All the things that can be tested and/or observed in an experiment.
C.) An explanation that best explains observable facts, has been well tested and is widely accepted.
D.) describing something using your senses.
E.) summary explaining whether or not the hypothesis was supported by the experimental results.
F.) the variable that changed after doing the experiment.
G.) the variable you choose to test.
H.) Using numbers or amounts to describe something.
I.) your prediction on how the experiment will turn out.
(Answer like 1a or 2b.) (I need answers for all 6 terms) if you help me, thank you like alot
Answer:
1: C
2: A
3: B
4: I
5: G
6: H
Explanation:
Please don't crucify me if I'm wrong ;-;
You have a particle of length 68 nm. What is this in meters? ( need help asap)
Answer:
B
Explanation:
How many liters of O2 at STP will react with 8.7 grams of C2H4 to form CO2 and H2O? C2H4 + 3 O2 -------> 2 CO2 + 2 H2O
Answer:
6.944 liters of O₂ at STP will react with 8.7 grams of C₂H₄ to form CO₂ and H₂O.
Explanation:
The balanced reaction is:
C₂H₄ + 3 O₂ ⇒ 2 CO₂ + 2 H₂O
Being the molar mass of the elements:
C: 12 g/moleH: 1 g/moleThen the molar mass of compound C₂H₄ is:
C₂H₄= 2*12 g/mole + 4*1 g/mole= 28 g/mole
By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), 1 mole of C₂H₄ acts. Then, being the mass of a mole of a substance, which can be an element or a compound, 1 mole of C₂H₄ is 28 g, which is the amount of mass that reacts in this case.
Then be able to apply the following rule of three: if by stoichiometry 28 grams of C₂H₄ react with 3 moles of O₂, 8.7 grams of C₂H₄ with how many moles of O₂ do they react?
[tex]moles of O_{2} =\frac{8.7 grams ofC_{2} H_{4}*3 moles of O_{2} }{28grams ofC_{2} H_{4}}[/tex]
moles of O₂= 0.31
The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.
Then we can apply the following rule of three: if by definition of STP 1 mole occupies 22.4 L, 0.31 moles how much volume will it occupy?
[tex]volume=\frac{0.31 moles*22.4 L}{1 mole}[/tex]
volume= 6.944 L
6.944 liters of O₂ at STP will react with 8.7 grams of C₂H₄ to form CO₂ and H₂O.
The volume of O₂ at STP that will react with the given C₂H₄ is 20.8 L
First, we will determine the number of moles of O₂ required.
From the given balanced chemical equation,
C₂H₄ + 3O₂ → 2CO₂ + 2H₂O
This means
1 mole of C₂H₄ is required to react completely with 3 moles of O₂
Now, we will determine the number of moles of C₂H₄ present
Mass of C₂H₄ = 8.7 g
Using the formula
[tex]Number\ of\ moles = \frac{Mass}{Molar\ mass}[/tex]
Molar mass of C₂H₄ = 28.05 g/mol
∴ Number of moles of C₂H₄ = [tex]\frac{8.7}{28.05}[/tex]
Number of moles of C₂H₄ = 0.31016 mole
Since
1 mole of C₂H₄ is required to react completely with 3 moles of O₂
Then,
0.31016 mole of C₂H₄ will react completely with 3 × 0.31016 mole of O₂
3 × 0.31016 = 0.9305 mole
∴ Number of moles of O₂ required is 0.9305 mole
Now, for the volume of O₂ at STP that will react
Since 1 mole of a gas occupies 22.4 L at STP
Then,
0.9305 mole of O₂ will occupy 0.9305 × 22.4 L at STP
0.9305 × 22.4 = 20.8432 L
≅ 20.8 L
Hence, the volume of O₂ at STP that will react with the given C₂H₄ is 20.8 L
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Veronica's teacher asked her to add another material that will dissolve in water into her beaker of sugar water. Which material should she add and how could she get it to dissolve quickly?
Answer:
she should add salt to the mixture
Explanation:
salt is easily able to dissolve
Increasing the temperature of a given amount of gas at constant volume causes the pressure to increase because _____. there is less space where the molecules can move around there are more molecules the molecules are striking a larger area with less force the molecules are moving more quickly
Answer:
the molecules are moving more quickly
Explanation:
The relationship between temperature and pressure is explained using the kinetic theory of matter.
As the temperature of the gas is increased, the molecules have a greater kinetic energy. This increased energy of the gas molecules make the collision between the molecules and with the walls of the container more rapid.
The correct option is;
the molecules are moving more quickly
24.Og sample of carbon contains how may moles?
Answer:
2 moles
Explanation:
1.9982182553889358 real number but round up to 2
help me please!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Which products would form if chlorine gas was bubbled through a solution of sodium bromide?
a. Na and BrCl
b. Na snd BrCl2
c. Na and Br2
d. Na(cl)2 and Br2
Answer:
NaCl and Br2
Explanation:
Edge 2020
Answer:
The Answer is C: Na and Br3
Explanation:
What is an animal-like, unicellular protist called?
protozoan
euglenoid
slime mold
decompos
Answer:
protozoan
Explanation:
An animal - like unicellular protist is called a protozoan. Such organisms shows similarities with animals.
Protozoans are unicellular organisms. They are similar to animals in that they perform nearly all life functions that makes animals very unique. They are mostly heterotrophs which feed on foods that have been produced by autotrophs. Examples are flagellates and ciliates.How many grams of KClO3 will dissolve in 300g of water at 50°C?
Answer:
50 g
Explanation:
Please brainiest
If you have 8.5 moles of water (H2O), how many grams of water do you have?
Answer: i think it is 144.16
Explanation:
Stephanie the Skydiver has a mass of 48kg, what is the force that she
exerts as she is falling to the ground?
Answer:
470.4N
Explanation:
Given parameters:
Mass of Stephanie = 48kg
Unknown:
Force she exerts while falling to the ground = ?
Solution:
The force she exerts is her weight;
Weight = mass x acceleration due to gravity
Now insert the parameters ands solve ;
Weight = 48 x 9.8 = 470.4N
Which section of the ocean floor is near the coastline of all continents?
Answer shallow ocean
Explanation:
i think
A compound whose empirical formula is NO₂ could have a molecular mass of? 23 g/mol 39 g/mol 92 g/mol 120 g/mol
The molecular formula of a compound gives the actual number of atoms of various elements present in one molecule of the compound. The molecular mass is 92 g/mol. The correct option is C.
What is empirical formula?The empirical formula of a compound can be defined as the formula which gives the simplest whole number ratio of atoms of various elements present in one molecule of the compound.
The molecular formula of a compound is a whole number multiple of its empirical formula.
Molecular formula = n × Empirical formula
The value of 'n' can be obtained from the relation:
n = Molecular mass / Empirical formula mass
Here the value of n = 2. Then,
Molecular mass = n × Empirical formula mass
Empirical formula mass of NO₂ = 45.8 g
2 × 45.8 = 91.6 ≈ 92 g/mol
Thus the correct option is C.
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