Answer:
1.79°C
Explanation:
Applying,
PV/T = P'V'/T'................. Equation 1
Where P = Initial presssure, V = Initial volume, T = Initial temperature, P' = Final pressure, V' = Final volume, T' = Final Temperature.
make T' the subject of the equation
T' = P'V'T/PV................ Equation 2
From the question,
Given: P = 760 mmHg (Standard pressure), T = 273 K (Standard temperature), V = 62.65 L, P' = 612 mmHg, V' = 78.31
Substitute these values into equation 2
T' = (612×78.31×273)/(760×62.65)
T' = 274.79 K
T' = (274.79-273) °C
T' = 1.79°C
A student claims that water's polarity is the reason it has a high specific heat.
What method could the student use to test his claim? (2 points)
Determine how dissolving salt in water affects the speccheat
Measure how much energy it takes to increase the temperature of water by one
degree
Perform research to see if other polar molecules have high specific heat
Mix water with an acid and test the new soeotic heat
Answer:
Perform research to see if other polar molecules have high specific heat
Explanation:
The specific heat of a substance is the amount of heat required to raise the temperature of a unit mass of the substance by 1°C.
In this question, the student is trying to establish a relationship between polarity and specific heat of substances. This claim can be tested by performing a research to see if other polar molecules have high specific heat.
If the research shows that a large number of other polar molecules have high specific heat, then the claim is confirmed to be true.
what is the net ionic equation for the neutralization of a strong acid and a strong base
Answer:
H^+(aq) + OH^-(aq) ------->H2O(l)
Explanation:
Neutralization is a reaction that occurs between an acid and a base to yield salt and water only.
The net ionic equation shows the species that are directly involved in a reaction. It eliminates the spectator ions.
Recall that a strong acid and a strong base ionizes completely in solution to yield hydrogen and hydroxide ions respectively.
The net ionic equation for the neutralization of a strong acid and a strong base is; H^+(aq) + OH^-(aq) ------->H2O(l)
What is the temperature of a 6.1 mole sample of He gas at 18.5 bar and volume of 115L? (Round answer to the hundredths place)
Answer:
4202.1 K
Explanation:
From;
PV=nRT
P= pressure of the gas = 18.5 bar
V = volume of the gas = 115L
n= number of moles of the gas = 6.1 mole
T= temperature of the gas = ?
R = gas constant = 0.083 L⋅bar⋅K−1⋅mol−1
T = PV/nR
T = 18.5 * 115/6.1 * 0.083
T = 2127.5/0.5063
T= 4202.1 K
11
Cr2O3 + 2Al → 2Cr + Al2O3
Chromium is produced by reacting its oxide with aluminum. If 76 g of Cr2O, and 27 g of Al completely react to form 51 g of Al2O3. how many grams of Cr are formed?
Answer:
Deci trebuie sa te aplici cu 2 din3 pe suprafata pamanyului chinez
Explanation:
Deci 1287+2086+2762+7:5
Which statements are true about physical changes? Select all that apply.
A.Physical changes are easily reversible.
B.An example is when wood burns and loses mass.
C.This is when atoms of an object change their state.
D.This is when there are changes between being a solid, liquid, or gas
Answer:
a
Explanation:
because physical changes are reversible while chemical changes are irreversible
Which of the following is an example of a nonmetal that is solid at room
temperature?
nitrogen
carbon
oxygen
bromine
Answer:
Carbon
Explanation:
At room temperature20–22 °C (68–72 °F), nitrogen and oxygen are gases, while bromine is a liquid.
If you say an object is hot, you are feeling the transfer of
a. chemical energy
b. thermal energy
c. potential energy
d. kinetic energy
Answer:
The answer to your question is B
can engineered food affect the environment? why? or why not?
Have GM crops caused damage to the environment? Crops do not damage the environment simply because they are GM. Some farming practices, such as the overuse of herbicides resulting in the excessive eradication of wild plants from farmland have been shown to harm the environment.
Some benefits of genetic engineering in agriculture are increased crop yields, reduced costs for food or drug production, reduced need for pesticides, enhanced nutrient composition and food quality, resistance to pests and disease, greater food security, and medical benefits to the world's growing population.
Answer:
Yes
Explanation:
Food that comes from the engineering food factories wrapped in plastic which can be dangerous for the environment.
How many moles of hypomanganous acid. H3 MnO4, are contained in 22.912 g?
Answer:
0.188mol
Explanation:
Using the formula;
mole = mass/molar mass
Molar mass of hypomanganous acid. (H3MnO4) = 1(3) + 55 + 16(4)
= 3 + 55 + 64
= 122g/mol
According to this question, there are 22.912g of H3MnO4
mole = 22.912g ÷ 122g/mol
mole = 0.188mol
What is the relationship between a planet's period of rotation and diameter?
There is, however, a relationship between a planet's distance from the Sun and its period of revolution. Kepler's third law of planetary motion says that the square of the planet's orbital period is proportional to the cube of its semimajor axis.
According to Kepler's third law of planetary motion, a planet's semimajor axis and orbital period are inversely proportional.
What is Kepler's third law?Kepler's third law is defined as the cubes of the semi-major axes of the planets' orbits are directly proportional to the squares of the planets' orbital periods. According to Kepler's Third Law, as an orbiting planet's radius increases, so does the time of its orbit around the Sun. A planet's orbits around the sun are accurately described by Kepler's third law in terms of their period and distance.
The cube (third power) of an orbital radius is directly related to the square (second power) of a planet's period (P2 = R3). The period of revolution shortens as the planet's distance from the sun rises.
Thus, according to Kepler's third law of planetary motion, a planet's semimajor axis and orbital period are inversely proportional.
To learn more about Kepler's third law, refer to the link below:
https://brainly.com/question/1608361
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What is a state function?
How many fluorine atoms are present in 125.0g of phosphorus pentafluoride?
molar mass of PF5 = 125.966 g/mol
125 g PF5 × (1 mol PF5/125.966 g PF5) = 0.992 mol PF5
0.992 mol PF5 × (6.022 × 10^23 molecules PF5);
= 5.97 × 10^23 molecules PF5
Since there 5 fluorine atoms per molecule of PF5,
(5.97.× 10^23 molecules PF5) × (5 atoms F/1 molecule PF5)
= 2.99 × 10^24 atoms F
I need help help me out with this plz
Answer:
D good luck on your test
Explanation:
What is the mole fraction of each component in a solution made by mixing 300 g of ethanol(C2H5OH) and 500 g of water?
Answer:
The mole fraction of ethanol and water in the solution are 0.19 and 0.81 respectively.
Explanation:
The Molar Fraction is a way of measuring the concentration that expresses the proportion in which a substance is found with respect to the total moles of the solution, which are calculated by adding the moles of solute (s) and solvent.
It is calculated by dividing the number of moles of one of the components by the total number of moles of the solution.
The sum of all the molar fractions of the substances present in a solution is equal to 1.
So, the expression to calculate the mole fraction is:
[tex]Molar fraction (Xi)=\frac{moles of sudstance}{total moles of the solution}[/tex]
Being the molar mass of the compounds:
Ethanol 46 [tex]\frac{g}{mol}[/tex] Water 18 [tex]\frac{g}{mol}[/tex]the number of moles that represent the mass quantities is calculated as:
Moles of ethanol: 300 grams* [tex]\frac{1 mol}{46 grams}[/tex] = 6.52 moles Moles of water: 500 grams* [tex]\frac{1 mol}{18 grams}[/tex] = 27.78 molesSo the total moles in solution are 6.52 moles + 27.78 moles = 34.3 moles
The mole fraction of ethanol in the solution is calculated as:
[tex]mole fraction of ethanol=x_{ethanol} =\frac{6.52 moles}{34.3 moles}[/tex]
[tex]x_{ethanol} =0.19[/tex]
The mole fraction of water in the solution is calculated as:
[tex]mole fraction of water=x_{water} =\frac{27.78 moles}{34.3 moles}[/tex]
[tex]x_{water} =0.81[/tex]
Then:
[tex]x_{water} +x_{ethanol} = 0.81 + 0.19[/tex]
[tex]x_{water} +x_{ethanol} =1[/tex]
The mole fraction of ethanol and water in the solution are 0.19 and 0.81 respectively.
.
The mole fraction of ethanol and water would be 0.19 and 0.81 respectively
Mole fractionThe mole fraction of a substance in a solution is the mole of that substance per total number of moles of substances in the solution.
Mathematically, mole fraction of a substance = mole of the substance/total mole of solution.
In this case:
Mole of 300 g ethanol = mass/molar mass
= 300/46
= 6.52 moles
Mole of 500 g water = 500/18
= 27.78 moles
Total moles = 6.52 + 27.78
= 34.3 moles
Mole fraction of ethanol = 6.52/34.3
= 0.19
Mole fraction of water = 0.81
Mole on mole fractions can be found here: https://brainly.com/question/2060778?referrer=searchResults
Where can you find the glands that produce salivary amylase?
Select one:
a. In your throat
b. In your stomach
c. In your mouth
d. In your intestines
Which is NOT part of the male reproduction system of a flower? stamen pollen anther pistil
Answer:
Pistil
Explanation:
I believe it is the pistil, because the pistil is part of the female reproductive system of a flower. A stamen is for the male reproductive system.
PLEASE HELP THIS IS SCIENCE
I'm pretty sure the answer is A.
Answer:
where is the answer??
Please do not just take the points without awnsering the question.
What is the frequency of a wave that has a wavelength of 0.50 m and a speed of 380 m/s?
Answer: f = 760 Hz
Explanation: speed = frequency · wavelength v = fλ.
frequency f = v/ λ = 380 m/s / 0.50 m = 760 Hz
What do modern scientist use in classifying organisms that Linnaeus did not use?
Answer:
The taxonomic units in modern taxonomy are domain, kingdom, phylum (division is sometimes used in botany in place of phylum), class, order, family, genus, and species.
The evidence used by scientists use to classify organisms are essentially form and evolutionary relationships.
Evolutionary relationships.
The diversity of living organisms on earth is very overwhelming. Human beings have come up with ways of organizing, or classifying, biological diversity throughout human history.
Organisms can be classified according to any number of criteria, including overall similarities, colors or ecological factors. It was agreed that the most useful way for scientists to organize biological diversity is to group organisms according to shared evolutionary history or characteristics. Grouping did not only result in an organized classification but it also contains and conveys information about our understanding of the evolutionary history of those groups.
Although our understanding of evolutionary relationships among organisms has greatly improved but it is not complete. Relationships among organisms and groups of organisms continues to be revised as new data becomes available comparing them to the past. Almost all taxonomies or systems of nomenclature based on evolutionary relationships among organisms are being revised.
The use of binomial nomenclature system was proposed by Carl Linnaeus. In this system, the phylogenetic relationship, cladistic analysis, and systematic approaches are used.
Explanation: Hello, i hope this helps. Your so very welcome!
name 3 common acids that you use in your home
Answer:
vinegar, soft drinks, seltzer water , citrus fruits
Explanation:
If 13 grams of copper sulfate is reacted with zinc how much of each product is produced?
Answer:
No. Of Moles of zinc = m/Ar
= 13/ 65.38 = 0.198 moles
From balanced equation, Mole ration between CuSO4 and Zn is 1 : 1
So only 0.198 moles of CuSO4 reacts, it is in excess
Mass = no of Moles X Mr
Mass = 0.198 X 159.5 = 31.59 grams
Volume = mass m denisty
Volume j 31.59 / 3.6 = 8.78 ml
Explanation:
i think this wrong
What do these two changes have in common?
a piece of avocado turning brown
butter melting on a hot day
Select all that apply.
1.Both Result In A different type oh molecule
2.Both are Change of state
3.both conserve math
4.Both invole with chemical bonds breaking
both conserve mass.......
Answer:
3.both are change of state
PLS HELP THIS IS SCIENCE !!
IGNORE THE QUESTIONS I ACCIDENTLY PRESSED ON
Answer:
10.)14
Explanation:
MARK AS BRAINLEST!!
Answer:
where is the answer??
Please do not just take the points without answering the question.
8). How many moles of oxygen gas must be placed in a 35.0 L container in order
to exert a pressure of 2.80 atmospheres at 15.0°C?
Answer:
4.1 moles
Explanation:
Applying
PV = nRT................ equation 1
Where P = pressure, V = volume, n = number of moles, R = molar gas constant, T = Temperature.
make n the subject of the equation
n = PV/RT.............. Equation 2
From the question,
Given: V = 35 L , P = 2.8 atm, T = 15 °C = (15+273) = 288 K, R = 0.083 L.atm/K.mol
Substitute these values into equation 2
n = (35×2.8)/(0.083×288)
n = 4.1 moles
A gas with a volume of 250 mL at a temperature of 293K is heated to 324K. What is the new volume of the gas?
Answer:
The new volume of the gas is 276.45 mL.
Explanation:
What is meant by the term compound? Provide an example
Answer:
I hope it helps
Explanation:
When two or more elements chemically combine in a fixed ratio by mass, the obtained product is known as a compound. Compounds can be defined as substances consisting of 2 or more different types of elements in a fixed ratio of its atoms. When the elements combine, some individual property of the elements is lost and the newly formed compound has new properties.Chemical Formula: Compounds are represented by their chemical formula. A chemical formula is a symbolic representation of the proportions of atoms that constitute a particular chemical compound.The chemical formula of water is H2O which shows two atoms of hydrogen and one atom of oxygen have combined to form one molecule of H2O. The chemical formula for common salt is NaCl which shows one atom of sodium and one atom of chlorine combine to form one molecule of NaCl.Select the correct answer. Which statement is true for a heating curve?
OA. It shows how the pressure of a substance changes when heated.
ов. It shows how the temperature of a substance changes when heated
OC. It shows how the volume of a substance changes when heated.
OD. It shows how the mass of a substance changes when heated.
please help
Answer:
OB
Explanation:
tht is correct make me brainliest
please help!!!!
A certain reaction is endothermic in the forward direction. The reaction has less moles of gas on the product side. Which of the following stresses would increase the yield of the product (shift right)?
a) increase the temperature
b) decrease the temperature
c) increase the volume
d) decrease the reaction concentration
Answer:
The correct answer is A, "increase the temperature."
Explanation:
By increasing the temperature, it would shift the reaction to the right. All of the other options would either cause the reaction to shift left, or are simply invalid. I hope this helps!
Increase in temperature will increase the yield of the product and cause a shift to the right.
What is an Endothermic reaction?This is the type of reaction in which reactants absorb heat energy from the surroundings to form products.
This depicts that an increase in temperature will increase the yield of products thereby making option A the most appropriate choice.
Read more about Endothermic reaction here https://brainly.com/question/1447631
NEED ANSWER FAST !!
Using the following equation,
a. Balance the equation by putting the smallest whole number coefficient in each blank
Fe2O3 + H2 à Fe + H2O
b. Use the balanced equation to calculate how many grams of iron can be made from 0.025 mol of Fe2O3
Answer: grams Fe (Round your answer to the nearest hundreths)
Answer:
.-.
Explanation:
List two disadvantages of using synthetic dyes
• Synthetic fibres are nonbiodegradable .
• Synthetic fibres melt and burn easily.
