Answer:
-4.59°C
Explanation:
Let's see the formula for freezing point depression.
ΔT = Kf . m . i
ΔT = Freezing T° of pure solvent - Freezing T° of solution
Kf = Freezing constant. For water if 1.86°C/m
m = molality (moles of solute in 1kg of solvent)
i = Van't Hoff factor.
0°C - Freezing T° of solution = 1.86°C /m . 1.30m . 1.9
Freezing T° of solution = - (1.86°C /m . 1.30m . 1.9)
Freezing T° of solution = - (1.86°C/m . 1.30m . 1.9) → -4.59°C
NaCl → Na⁺ + Cl⁻
How many moles of NaCl can be made from 16 moles of Na?
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Answer:The answer is C) The total mass of C and D only.
If 2.50 grams of ethane is allowed to react with 5.00 grams of oxygen how many grams of water would be expected?
Answer:
The mass of water produced is 4.29 g.
Explanation:
Given;
reacting mass of ethane, C₂H₆ = 2.5 g
reacting mass of oxygen, O₂ = 5.0 g
The balanced combustion reaction is given as follows;
2C₂H₆ + 7O₂ ----------------> 4CO₂ + 6H₂O
Based on the balanced equation above;
requires
7.0 moles of oxygen -----------------------> 2.0 moles of ethane
requires
5.0 g of oxygen --------------------------> x gram of ethane
x = (2 x 5) / 7
x = 1.43 g
Ethane is in excess of 1.07g (2.5 g - 1.43g)
Now, determine the mass of water produced by 1.43 g of ethane;
requires
2.0 moles of ethane -----------------------> 6.0 moles of water
requires
1.43 g of ethane --------------------------> y gram of water
y = (6 x 1.43) / 2
y = 4.29 g
Therefore, the mass of water produced is 4.29 g.
Question 1 (1 point)
A party balloon is filled up under the following conditions: 1.1 atm 65°C, 1,55 liters. Then, the balloon is taken to an outdoor wedding with
sightly different conditions: 1.2 atm and 92°C. What is the new size of the balloon?
Do not enter a unit, just the number
Round your answer to 2 sig figs.
Answer:
.5
Explanation:
Answer:
1.5
Explanation:
1.5
An atom of a mystery element contains 6 protons, 6 electrons, and 8 neutrons.
What is the mass number?
Answer:
14
Explanation:
Mass number is just the value of the protons and neutrons added, in this case its 14
The mass of the Atom is determined mainly by the
a) mass of the neutrons
b) mass of the neutrons and protons
c) mass of the electrons
d) mass of the electrons and neutrons
Answer:
B.mass of the neutrons and protons
Explanation:
hope it's help..
A solution is prepared by mixing 769 mL of ethanol with 507 mL of water. The molarity of ethanol in the resulting solution is 10.8 M. The density of ethanol at this temperature is 0.7893 g/mL. Calculate the difference in volume between the total volume of water and ethanol that were mixed to prepare the solution and the actual volume of the solution.
Answer:
57 mL
Explanation:
To make things clear, when 769 mL of ethanol were mixed with 507 mL of water, the resulting volume was not (769+507) 1276 mL, but a lower value. This is because of the interactions between liquid molecules.
First we calculate how many grams of ethanol are there in 769 mL, using the given density:
mass = density * volume0.7893 g/mL * 769 mL = 606.97 g ethanolThen we convert 606.97 g of ethanol into moles, using its molar mass:
606.97 g ÷ 46.07 g/mol = 13.17 molNow we calculate the actual volume of the solution, using the definition of molarity:
Volume = Moles / Molarity13.17 mol / 10.8 M = 1.219 LFinally we convert 1.219 L to mL, and calculate the difference in volume:
1.219 L * 1000 = 1219 mL1276 mL - 1219 mL = 57 mLWhat do acids do in solution?
What is an Oxidizing Agent? ( answer in simple language)
Answer:
an agent that helps accept electrons on others like oxygen, halogens
Explanation:
a substance that tends to bring about oxidation by being reduced and gaining electrons.
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A student measures the volume of a rock, and then repeats the measurement two times. For the three measurements to be very precise, what must be true about them?
A. The measurements must be very close to the true volume of the rock.
B. The measurements must be very close to one another.
C. At least one of the measurements must be equal to the true volume of the rock.
D. The three measurements must be reported in whole numbers, not decimals.
Answer:
i think b
Explanation:
A student measures the volume of a rock and then repeats the measurement two times. For the three measurements to be very precise the measurements must be very close to one another for rock. Option B is correct.
What is precise?While measuring something is the measured value is close to each other then the result measurement is said to be precise and the phenomena are called precision.
In the measurement of rock, the measured values must be close to each other and do not vary much then only the measurement of students can be precise.
Therefore, Option B is correct, the measurements must be very close to one another for the rock student measures the volume of a rock and then repeat the measurement two times. For the three measurements to be very precise.
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Silver has a density of 10.5 grams/cm3. What would be the mass of a 5 cm3 piece of sliver
Answer:
52.5 g
Explanation:
Density= mass/volume
Rearranging the equation gives us m= d(V)
m= d(V)
m= (10.5 grams/cm^3)(5 cm^3)
m= 52.5 g
Kevin is working on a model that shows the positions of Earth, the Moon, and the Sun during the phases of the Moon. How should he position them to show a New Moon?
How many atoms can be found in 6.7 moles of Bromine (Br)
Question 7 options:
4.03 x 10^24
9.13 x 10^-24
8.99 x 10^22
3.31 x 10^24
Answer:
The first one is correct, 4.03 x 10^24.
Which statement is true? a. Energy is capability of doing work b. A cup of water has kinetic energy c. Kinetic energy is stored energy in substances. d. Potential energy is enery in motion. e. Heat and electricity are different forms of energy
Answer:
Option A an E.
Explanation:
Energy can be described as the capability to do work. It is what has to be transferred to an object in order to get this object to do work. Energy can be in various forms such as heat energy, kinetic, potential, electrical, chemical, nuclear etc.
It takes energy to do quite a number of things, from cooking food to driving and also in engaging in exercises.
The triple point of water occurs at a pressure of 4.59 mmHg.
What is the pressure in atm?
Answer:
The pressure in atm is 6.04 x 10^-3
Explanation:
Pressure of the gas is defined as the force exerted by the particles on the walls of the container. It is expressed in various terms like 'mmHg', 'atm', 'kiloPascals' etc..
All these units of pressure are inter convertible.
Pressure of the gas = 4.59 mm Hg
760 mm Hg = 1 atm
4.59 mm Hg= 1/760 x 4.59 = 6.04 x 10^-3atm
The pressure in atm is 6.04 x 10^-3
salat tarawih itu boleh dilakukan di masjis
You have 1 1/2 moles of 1 kg bottles of O2. What is the mass of O2 that you have? A. 9.033x10^23 kg B. 9.033x10^23 atoms C. 1.80x10^27 kg D. 1.806x10^24 moles
Answer:
b
Explanation:
trust
Answer:
B
Explanation:
How many grams of molecular chlorine will be required to completely react with 0.0223 moles of sodium iodide according to the following reaction?
2Nal + Cl2 ---> 2NaCl + I2
A. 1.57 104 grams
B. 3.16 grams
C. 0.0112 grams
D. 0.791 grams
The amount of chlorine will be 0.791 gram required to completely react with 0.0223 moles of sodium iodide .
The given chemical reaction is :
2Nal + [tex]Cl_{2}[/tex] → 2NaCl + [tex]I_{2}[/tex]
It is given that:
Amount of sodium iodide = 0.0223 mol.
Atomic mass of chlorine = 35.45 g.
The amount of chlorine can be calculated as:
0.0223mol. NaI × (1mol. Cl₂/2mol. NaI) × (35.45g/1mol. Cl2)
=0.791 grams
Therefore, the correct answer will be option (D).
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11.7 g of NaCl and 4.5 g of KBr were dissolved
in 47 g of water. What is the molality of NaCl
in the solution?
Answer:
4.26m
Explanation:
Molality , m, is an unit of concentration in chemistry defined as the ratio between moles of solute (In this case, NaCl) and kg of solvent (In this case, water).
To solve the question we need to find the moles of NaCl and the mass of water in kg:
Moles NaCl -Molar mass: 58.44g/mol-:
11.7g * (1mol / 58.44g) = 0.200 moles
Mass of Water in kg:
47g * (1kg / 1000g) = 0.047kg
Molality is:
0.200 moles / 0.047kg =
4.26m
periodic table
fill in the box :)
Answer:
I took a screen shot of your image, and wrote on top of it!
Explanation:
Hope this helps! :)
The volume occupied by a certain mass of methane gas (CH4)
at STP is 420 L. What will be its mass in grams at STP?
a
500 g
b 400 g
C 300 g
d None of the above
Answer: 300 g
Explanation: I guessed and got it right
420 liter of volume is occupied by 300 grams of methane gas at standard temperature and pressure (STP).
How we write the ideal gas equation at STP?Ideal gas equation of methane gas at STP (standard temperature pressure) can be written as:
PV = nRT, where
P = pressure = 1 atm
V = volume = 420 L (given)
R = universal gas constant = 0.082 L.atm / k.mole
T = absolute temperature = 273 K
n = no. of moles to find?
Putting all these values in the above equation and calculated for the n:
n = (1 × 420) / (0.082 × 273) = 18.76 moles
Now we calculate mass of methane by the definition of moles as:
n = W/M, where
M = molar mass of methane = 16 g/mole
W = to find?
W = 18.76 × 16 = 300.2 grams or 300grams.
Hence, option (c) is correct i.e. 300 grams of methane occupy 420 L volume.
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is the maximum population that a given area can support.
Carrying capacity
Population growth
Limiting factor
Immigration rate
The carrying capacity is the maximum number of individuals of a species that an environment can support. Population size decreases above carrying capacity due to a range of factors depending on the species concerned, but can include insufficient space, food supply, or sunlight.
All of the following are empirical formulas EXCEPT
a) Fe(OH)3
b) Na2SO4
c) N204
d) Sn3(PO4)2
menciona tres ejemplos en los que un cálculo incorrecto en los en ingredientes indispensables para la elaboración de un producto traería consecuencias graves químicamente hablando
Explanation:
Cada producto o servicio, independientemente de su propósito, debe ser seguro de usar y desarrollado de acuerdo con los más altos estándares de calidad y seguridad.
Algunos ejemplos de cálculo incorrecto de ingredientes que tendrían graves consecuencias químicas podrían ser:
Medicamentos y vacunas: Este es quizás uno de los ejemplos que tendría las consecuencias más graves para las personas si hubiera un cálculo incorrecto de ingredientes, ya que la producción de medicamentos y vacunas es una industria que requiere la máxima calidad agregada debido a que se ocupa directamente de la salud y los errores de formulación pueden agravar la enfermedad y causar la muerte. Actualmente tenemos el ejemplo de la vacuna para el control de la pandemia, que antes de ser aprobada tuvo que someterse a una serie de investigaciones, pruebas en humanos y diferentes fases para demostrar su efectividad y no causar daño al organismo humano.
Cosméticos: Existen cosméticos de la industria de la belleza que tienen la función de prevenir el envejecimiento cutáneo, alisar el cabello, etc. Por tanto, un cálculo incorrecto de los ingredientes químicos también podría provocar daños irreversibles a la salud, como quemaduras en la piel, caída del cabello, alergias, cáncer, etc.
Alimentos: La industria alimentaria utiliza componentes químicos con el fin de conservar los productos y aumentar la vida útil, por lo que si se usan en cantidades mayores de las necesarias, dichos compuestos pueden causar enfermedades en las personas como intoxicación alimentaria, cáncer, gastritis, etc.
What is the mass of 5.80 × 10²³ atoms of silver (Ag)?
A. 0.00893 g
B. 0.00963 g
C. 104 g
D. 112 g
Answer:
104 g
Explanation:
i just solved it
Sound Wave, Ripple in water, Guitar String, TV Signal, Which one does not belong? Why?
Answer:
The TV signal.
Explanation: Hope this is right! :)
What is the mass of 0.0071 moles of lead?
Answer: 1.47 g
Explanation:
207.2 g/mol × 0.0071 mol = 1.47 g
You can find the molar mass of lead, Pb, on the periodic table, 207.2 g/mol.
0.0071 moles lead = 1.47112 grams
True or False. Physical changes result in the formation of a new substance.
True or False. A major clue to a chemical change is the formation of a new
substance.
Answer:
1. false
2. true
Explanation:
I hope this helps
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Answer:
finally found
31th July 2000
ANSWER FAST
is water wet?
a.) yes
b.) no
c.) a baby goat is a kid
Answer:
c
Explanation:
Explain what a conjugate acid is and what a conjugate base is.
Answer:
A conjugate acid, within the Brønsted–Lowry acid–base theory, is a chemical compound formed when an acid donates a proton to a base—in other words, it is a base with a hydrogen ion added to it, as in the reverse reaction it loses a hydrogen ion
Explanation:
According to the A.P.E.X. glossary:
A conjugate acid is the form a base takes after it gains a hydrogen ion (or proton), and a conjugate base is the form an acid takes after it loses a hydrogen atom (or proton).