I NEED HELP!!!
How much heat (kJ) is needed to raise the temperature of 100.0 grams of water from 290.0 K to 325.0 K?
(Specific Heat of Water = 4.18 J/g °C)
• 10450
• 146
• 14630
• 10.5
• 14.6
Answer:
Explanation:
Formula
Heat = m * c * delta t
t = temperature in centigrade.
The first thing you have to do is convert kelvin degrees to centigrade. The conversion factor is - 273. The formula is degrees centigrade = degrees kelvin - 273. It is easier to understand with a couple of examples.
290o K = 290 - 273 = 17325. K = 325 - 273 = 52Solution
Heat = 100.0 grams * 4.18 J/g*C * (52 - 17)
Heat = 100 * 4.18 * 35
Heat = 14630 Joules
But you want kj
Heat = 14630 / 100 = 14.63
Answer
Heat = 14.6 kj
How much energy is needed to melt 230 g of ammonia (NH3)? (Heat of fusion is 5.66 kJ/mol)
Give your answer in units of kJ with correct significant figures.
Moles of ammonia
Given mass/Molar mass230/1713.5mol1mol requires 5.66KJ energy
13.5mol requires
5.66(13.5)76.4KJSuppose 0.258g of lead(II) acetate is dissolved in 250.mL of a 13.0 m M aqueous solution of ammonium sulfate.
Calculate the final molarity of acetate anion in the solution. You can assume the volume of the solution doesn't change when the lead(II) acetate is dissolved in it.
Round your answer to 3 significant digits.
Molarity is the estimation of the solute concentration in the solution. The final molar concentration of the acetate anion in the solution is 0.006 M.
What is Molarity?
Molarity is the ratio of the moles to the volume in liters.
Given,
Mass of lead (II) acetate = 0.258 gm
Volume of solution = 0.25 L
Moles are calculated as:
Moles = mass ÷ molar mass
= 0.258 g ÷ 325.29 g/mol
= 0.00079
Molarity is calculated as:
M = moles ÷ volume
= 0.00079 ÷ 0.25
= 0.0032
The molar concentration of the acetate ions: 2 × 0.0032 = 0.0064 M
Therefore, the molarity of the acetate anion in the solution is 0.006 M.
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screen shot is attached , please help
Answer: 0.680 mol
Explanation:
From the coefficients of the equation, we know that for every 3 moles of carbon dioxide produced, 5 moles of oxygen gas are consumed.
So, the answer is (5/3)(0.408) = 0.680 mol (to 3 sf)
If 45 g of O2 gas in a 500 mL container is exerting a pressure of 5.2 atm, what temperature is the gas?
If 45 g of O2 gas in a 500 mL container is exerting a pressure of 5.2 atm, 22.53K is the temperature in the gas.
What is an ideal gas equation?The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).
First, calculate the moles of the gas using the gas law,
PV=nRT, where n is the moles and R is the gas constant. Then divide the given mass by the number of moles to get molar mass.
Given data:
P= 5.2 atm
V= 500 mL =0.5 L
n=?
R= [tex]0.082057338 \;L \;atm \;K^{-1}mol^{-1}[/tex]
T=?
[tex]Moles = \frac{mass}{molar \;mass}[/tex]
[tex]Moles = \frac{45 g}{32}[/tex]
[tex]Moles = \frac{45 g}{32}[/tex]
Moles = 1.40625
Putting value in the given equation:
[tex]\frac{PV}{RT}=n[/tex]
[tex]1.40625= \frac{5.2 \;atm\; X \;0.5 \;L}{0.082057338 \;L \;atm \;K^{-1}mol^{-1} X T}[/tex]
T= 22.53167034 K= 22.53K
Hence, If 45 g of O2 gas in a 500 mL container is exerting a pressure of 5.2 atm, 22.53K is the temperature in the gas.
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If 3.66•10^23 molecules of a substance have a mass of 24.31g, what is the molar mass of the substance?
Answer:
Molar mass of substance = 40.0 g/mol
Explanation:
• First calculate the number of moles in 3.66 × 10²³ :
no. of moles = number of particles / Avogadro's Number
= (3.66 × 10²³) / (6.022 × 10²³)
= 0.6078 mol
• Now use the following equation to calculate the molar mass:
Molar mass = mass of substance / no. of moles
= 24.31 / 0.6078
= 40.0 g/mol
3.4x10^4=
In ordinary numbers
3.4x10^4 = 34000
3.4×104 = 3.4 ×10000 = 34×1000=34000
What is a ordinary number?In linguistics, ordinal integers or ordinal digit words are terms representing place or rank in sequential ordering; the order may be of a size, significance, record, and so on (e.g., "third", "tertiary").
They vary from cardinal digits, which mean quantity (e.g., "three") and other kinds of numerals.
Thus, 34000 is the answer.
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25cc of 5 % NaOH solution neutralized 30cc of h2sO4 solution. Whatis normality of H2SO4?
The normality of the H₂SO₄ that reacted with 25cc of 5 % NaOH solution is 1.1 N.
What is the molarity of 5% NaOH?The molarity of 5% NaOH is 1.32 M
25 cc of NaOH neutralized 30cc of H₂SO₄ solution.
Equation of reaction is given below:
2 NaOH + H₂SO₄ ---> Na₂SO₄ + 2 H₂OMolarity of H₂SO₄ = 1.32 x 1 x 25/(30 x 2) = 0.55 M
Normality = Molarity × moles of H⁺ ions per mole of acidmoles of H⁺ ions per mole of H₂SO₄ = 2
Normality of H₂SO₄ = 0.55 x 2 = 1.1 N
In conclusion, the normality of an acid is determined from the molarity and the moles of H⁺ ions per mole of acid.
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Question 21
How many moles of O atoms are in 88 grams of CO₂?
2.8 moles
6.0 moles
1.00 moles
2.0 moles
4.0 moles
Calculate the osmotic pressure of a 5% solution of glucose at 18°C.
Answer:
6.97 atm is the osmotic pressure.
Which is a true statement about an exterior angle of a triangle?
• A. It is formed by two segments that are not sides of the triangle.
B. It is formed by two segments that are sides of the triangle.
C. It forms a linear pair with one of the interior angles of the triangle.
D. It is complementary to one of the interior angles of the triangle.
SUBMIT
The only true statement about an exterior angle of a triangle from the above is that it forms a linear pair with one of the interior angles of the triangle.
What is a triangle?A triangle can be defined as a one of the plane shapes which has three sides and three angles
So therefore, the only true statement about an exterior angle of a triangle from the above is that it forms a linear pair with one of the interior angles of the triangle.
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What is the definition of specific heat? O A. The heat required to break the molecular bonds within a substance B. The total amount of energy contained within 1 mole of a substance C. The heat needed to raise the temperature of 1 g of a substance 1°C D. The temperature change between the melting and boiling points of a substance N What is the definition of specific heat ? O A. The heat required to break the molecular bonds within a substance B. The total amount of energy contained within 1 mole of a substance C. The heat needed to raise the temperature of 1 g of a substance 1 ° C D. The temperature change between the melting and boiling points of a substance N
Answer:
C
Explanation:
C . specific heat = J / gm-C
a student collects 0.36 mol of methane gas (CH4) at STP. Determine the following mass of the methane gas
5.7744 g is the mass of the methane gas.
What are moles?A mole is defined as 6.02214076 × [tex]10^{23}[/tex] of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
[tex]Moles = \frac{mass}{molar \;mass}[/tex]
[tex]0.36 mol = \frac{mass}{16.04 g/mol}[/tex]
Mass =5.7744 g
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The company claims that the mineral supplement can effectively prevent the common cold.A scientist disputes the claim, saying and error exists in the setup of the groups for the investigation. Which change to the investigation would remove the source of this error?
A change to the investigation which would remove the source of this error is to test a fourth group in which the people do not receive the mineral supplements.
What is a Scientific method?
This is the experimental techniques employed in science and involves hypothesis, observations etc.
Removing an error in a scientific method involves repeated experiments and using a large sample which is why the fourth group should be taken into consideration.
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116) If the juice from a lemon is mixed with 55% water the lemon juice is the A) solution B) solute C) solvent D) None of the above
117) If the juice from a lemon is mixed with 55% water the water is the A) solution B) solute C) solvent D) None of the above
118) Which of the following is NOT c onsidered a solution? A) Gasoline B) Coca-Cola C) Water
119) Which statement is true? D) Bleach A) All mixtures are solutions. B) All mixtures are acidic. C) All solutions are mixtures. D) All solutions are alkalizing
120) Which of the following is considered a solution? A) 14k gold ring C) Sand in the ocean B) Wood chips on the ground D) Rocks in water
Answer:
Explanation:
d because a b and c is in correct
A 0.250 L solution is made with 1.60 g of glucose, in water at 25.00∘C. What is the osmotic pressure of the solution?
Use −273.15∘C for absolute zero.
Use R=0.08206 L atmmol K for the ideal gas constant
The osmotic pressure of the 0.250 L solution made with 1.60 g of glucose, in water at 25.00°C is 0.869atm.
How to calculate osmotic pressure?The osmotic pressure of the solution can be calculated using the following expression:
PV = nRT
where;
P = pressureV = volumen = no of molesT = temperatureR = gas law constantno of moles of glucose = 1.60g ÷ 180g/mol = 8.89 × 10-³mol
P × 0.250 = 0.00889 × 0.08206 × 298
0.25P = 0.217
P = 0.217/0.25
P = 0.869atm
Therefore, the osmotic pressure of the 0.250 L solution made with 1.60 g of glucose, in water at 25.00°C is 0.869atm.
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If a balloon containing 0.342 moles of gas is left out in sun, the pressure is 1.54 atmospheres. If the temperature is 300 K, what is the volume of the balloon? Note R is 8.314 L kPa mol-1K-1 or 0.821 L atm mol-1K-1 .
Answer:
54.7 L
Explanation:
To find the volume, you need to use the Ideal Gas Law. The formula looks like this:
PV = nRT
In this formula,
-----> P = pressure (atm)
-----> V = volume (L)
-----> n = number of moles
-----> R = constant (0.821 L*atm/mol*K)
-----> T = temperature (K)
You need to use the second R constant because the pressure is measured in atmospheres (atm) and not kPa. Because you have the all of the necessary variables except for volume, you can substitute them into the Ideal Gas Law formula and solve.
P = 1.54 atm R = 0.821 L*atm/mol*K
V = ? L T = 300 K
n = 0.342 moles
PV = nRT
(1.54 atm)V = (0.342 moles)(0.821 L*atm/mol*K)(300 K)
(1.54 atm)V = 84.2346
V = 54.7 L
0.198 kg of ethyl alcohol, C2H5OH, in 0.500 L of solution, the concentration of ethyl alcohol in vodka .0
8.59 is the concentration of ethyl alcohol when 0.198 kg of ethyl alcohol.
Define the molarity of a solution.
Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution. Molarity is also known as the molar concentration of a solution.
Given data:
Volume of solution = 0.500 L
Given the mass of [tex]C_2H_5OH[/tex]= 0.198 kg= 198g
Molar mass of [tex]C_2H_5OH[/tex] = 46.07 g/mol
Moles of [tex]C_2H_5OH[/tex] = 4.297807684
[tex]Molality = \frac{Moles \;solute}{Volume \;of \;solution \;in \;litre}[/tex]
[tex]Molality = \frac{4.297807684}{0.500 L}[/tex]
Molality = 8.595615368 =8.59M
Hence, 8.59 is the concentration of ethyl alcohol when 0.198 kg of ethyl alcohol.
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Do the ch3f molecules appear to attract each other much? briefly describe their interaction.
Neither attract much nor allows it be free.
How the molecules behave in such way?
Because fluorine has a higher electronegativity than carbon and hydrogen, CH3F possesses a non-zero dipole moment. As a result, fluorine draws a partial negative charge whereas other atoms (such as carbon or hydrogen) draw a partial positive charge, leading to a non-zero dipole moment in CH3F. Lewis' structure, CH3F, is made up of one carbon atom, three hydrogen atoms, and one fluorine atom. Carbon is the key atom in the CH3F lewis structure because it is the least electronegative. The CH3F lewis dot structure consists of 3 lone pairs and a total of 4 bound pairs.
Properties of CH3F
It molar mass is 34.03 g/mol.The density of CH3F is 1.4397 g/L and 0.557 g/cm³ at saturated pressure and temperature.The melting point of CH3F is -137.8ºC and the Boiling point is -78.4ºC.Its vapor pressure is 3.3 MPa.Its IUPAC name is Fluoromethane.Know more about carbon here:
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Oxygen decays to form nitrogen. 15 8 O → 15 7 N + 0 1 e This type of nuclear decay is called
The type of nuclear decay in which Oxygen decays to form nitrogen is beta plus decay.
What is a beta plus decay?A beta plus decay is a type of decay in which a proton in an element disintegrates to produce a neutron resulting in a decrease in the atomic number of the radioactive element.
In the given equation below:
[tex]^{15}_{7}O \rightarrow ^{15}_{7}N + ^{0}_{1}e[/tex]Oxygen decays to form nitrogen due to a decrease in atomic number.
This is an example of beta plus decay.
In conclusion, oxygen decays to form nitrogen beta plus decay.
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what is the study of matter called
How many total atoms are in 0.680 g of P₂O5?
Answer: 2.88×[tex]10^{24}[/tex]atoms [tex]P_{2}O_{5}[/tex]
Explanation: First, using stoichiometry, we must convert this from grams to moles, then from moles to atoms.
1. For the first step, we should also look at the periodic table to find the molar mass of the compound, then use that as the denominator.
[tex]0.680g P_{2} O_{5} *\frac{1molP_{2} O_{5} }{141.948gP_{2} O_{5} } =4.79mol P_{2} O_{5}[/tex]
2. Now that it is converted to moles, we must convert it to atoms by multiplying it by Avogadro's number.
[tex]4.79molP_{2} O_{5} *\frac{6.022X10^{23} }{1mol} =2.88*10^{24}[/tex]
With this information, we know that there are [tex]2.88X10^{24}[/tex] total atoms in 0.680 grams [tex]P_{2} O_{5}[/tex].
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What part of the scientific method involves controlling variables while testing a hypothesis? (2 points) Select one: a. Analyzing data b. Conducting an experiment c. Drawing a conclusion d. Making observations
Answer:
D
Explanation:
best choice, makes the most sense
In the scientific method, conducting an experiment involves designing and performing controlled experiments to test a hypothesis and the correct option is option B.
Scientists manipulate the independent variable while controlling other variables (dependent and controlled variables) to observe and measure the effect on the dependent variable.
By controlling variables, scientists can isolate the factors that influence the outcome, ensuring that any observed changes are a result of the manipulated variable and not other unrelated factors. This step allows for the collection of reliable data, which is essential for drawing meaningful conclusions based on the evidence gathered from the experiment.
Thus, the ideal selection is option B.
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Sulfuryl chloride, SO2Cl2(g), decomposes at high temperature to form SO2(g) and
Cl2(g). The rate constant at a certain temperature is 4.68 x 10-5s-1. What is the the order of the reaction?
A) zero
B) first
C) second
D) third
E) More information is needed to determine the order.
The rate constant is s-1 which is the unit of first order reaction rate constant thus the reaction is a first order reaction. Option B
What is the rate of reaction?The term rate of reaction refers to how fast or slow a reaction proceeds a reaction could be;
First orderSecond order or Third orderWe can know the order of reaction here by looking at the unit of the rate constant. The rate constant is s-1 which is the unit of first order reaction rate constant thus the reaction is a first order reaction.
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Question 1
One mole of C_2H_6OC
2
H
6
O has two moles of Carbon (C), six moles of Hydrogen (H) and one mole of Oxygen (O). How many moles of Hydrogen is in 0.2 moles of C_2H_6OC
2
H
6
O?
In the given compound, 0.2 mole of C₂H₆O will contain 1.2 moles of hydrogen.
chemical compoundIn the balanced chemical compound C₂H₆O, we can deduce the following;
1 mole of C₂H₆O contains 6 moles of hydrogen
0.2 mole of C₂H₆O = ?
= 0.2 x 6 moles = 1.2 moles of hydrogen
Thus, in the given compound, 0.2 mole of C₂H₆O will contain 1.2 moles of hydrogen.
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11 . A guest orders a drink that contains 4 1/2 ounces of 80-proof liquor. Approximately how many drinks does this beverage contain?
From the calculations that have been done, there are 3 drinks.
How many drinks are there?The information that we have been provided here is very important. We can obtain the amount of alcohol by looking at the fact that it contains 80-proof liquor.
This 80-proof liquor. is an equivalent of 40% alcohol this means that there is 1.5 ounce of distilled spirit.
Thus, the number of drinks there is;
4.5/1.5 = 3
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A section of a high speed test track is circular with a radius of curvature R = 1860 m.
At what angle of θ should the track be inclined so that a car traveling at 61.0 m/s (136 mph) would keep moving in a circle if there is oil on that section of the track, i.e., it would not slip sideways even with zero friction on that section. (Hint: The car's vertical acceleration is zero.)
Using Newton's second law, the car is experiencing a net force parallel to the banked curve such that
[tex]mg \sin(\theta) = \dfrac{mv^2}r \implies \sin(\theta) = \dfrac{v^2}{rg}[/tex]
where [tex]v[/tex] is the tangential speed of the car and [tex]r[/tex] is the radius of the curve. Solve for [tex]\theta[/tex] :
[tex]\sin(\theta) = \dfrac{\left(61.0\frac{\rm m}{\rm s}\right)^2}{(1860\,\mathrm m)g} \approx 0.204 \implies \theta = \sin^{-1}(0.204) \approx \boxed{11.8^\circ}[/tex]
how many moles of pbcl2 are produced when 16 alcl3 are consumed
25g of gold with initially 27grade centigrade what is the final temperature uppon absorbing 2.3kj of heat
The final temperature of the mass of gold is 737 °C.
What is the specific heat capacity of gold?The specific heat capacity of gold is 0.126 J/g/K
The final temperature, T2 of the gold is calculated as follows:
T2 = T + Q/mc
where;
T is initial temperature, m is mass, and c is specific heat capacity of gold.
T2 = 27 + 2.3 x 1000/(25 x 0.126)
T2 = 737 °C
Therefore, the mass and heat capacity of gold determines its final temperature.
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A rate constant obeys the Arrhenius equation, the factor A being 2.2 10^13 s-1 and the
activation energy being 150. kJ mol-1. What is the value of the rate constant at 227C, in
s-1?
4.743 x [tex]10^{-3}[/tex] s-1 is the value of the rate constant.
What is an Arrhenius equation?The Arrhenius equation describes the relationship between the rate of reaction and temperature for many physical and chemical reactions.
As per Arrhenius equation,
k = Ae-Ea÷RT
T = 227 = 500.15 K
R = 0.008314 kJ/K mol
Ea = 150 kJ/mol
Ea÷RT
= 150÷(0.008314 x 500.15)
= 36.073
k = Ae-36.073 = (2.2 x [tex]10^{13}[/tex] s-1) (2.156 x [tex]10-{16}[/tex])
k = 4.743 x [tex]10^{-3}[/tex] s-1
So, the correct answer is option d) i.e. 4.7 x [tex]10^{-3}[/tex] s-1
As per Arrhenius equation,
k = Ae-Ea/RT
T = 227 = 500.15 K
R = 0.008314 kJ/K mol
Ea = 150 kJ/mol
Ea÷RT = 150÷(0.008314 x 500.15) = 36.073
k = Ae-36.073 = (2.2 x [tex]10^{13}[/tex] s-1)(2.156 x [tex]10^{-16}[/tex])
k = 4.743 x [tex]10^{-3}[/tex] s-1
Hence, 4.743 x [tex]10^{-3}[/tex] s-1 is the value of the rate constant.
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