Answer:
Psol = 433 torr
The solution is not ideal and the solution deviates from Raoult's law in a positive manner
Explanation:
The vapout pressure of a solution can be obtained using Raoult's law:
Psol = P°A* XA + P°B*XB
Where Psol is vapour pressure of solution
P° is vapour pressure of pure substance
X is mole fraction
As we have vapour pressure of pure carbon disulfide and acetone we need to find mole fraction of each compound to solve the vapour pressure of the solution:
Moles carbon disulfide:
3.95g CS₂ * (1mol / 76.13g) = 0.05188 moles
Moles acetone:
2.43g acetone * (1mol / 58.08g) = 0.04184 moles
Mole fraction of CS₂:
0.05188 moles / (0.05188mol + 0.04184mol) =
0.5536
Mole fraction acetone:
1 = X(CS₂) + X(Acetone)
X(Acetone) = 1 - 0.5536 = 0.4464
Solving for vapour pressure of the solution:
Psol = 515torr*0.5536 + 332torr*0.4464
Psol = 433 torrAs the experimental vapor pressure was 645torr > 433 torr (Theoretical vapor pressure), the solution is not ideal and the solution deviates from Raoult's law in a positive manner
The density of silver is 10.5 g/cm3. What is the mass (in kilograms) of a cube of silver that measures 0.94 m on each side?
Answer:
8721.132 Kg.
Explanation:
The following data were obtained from the question:
Density (D) of silver = 10.5 g/cm³
Length (L) of silver = 0.94 m
Mass (m) of silver =.?
Next, we shall determine the volume of silver. This can be obtained as follow:
Volume = Length × Length × Length
Volume = L × L × L
Volume = L³
Length (L) of silver = 0.94 m
Volume (V) of silver =?
Volume (V) of silver = 0.94³
Volume (V) of silver = 0.830584 m³
Next, we shall convert 0.830584 m³ to cm³. This can be obtained as follow:
1 m³ = 1×10⁶ cm³
Therefore,
0.830584 m³ = 0.830584 m³ / 1 m³ × 1×10⁶ cm³
0.830584 m³ = 830584 cm³
Therefore, 0.830584 m³ is equivalent 830584 cm³.
Thus, the volume of the silver is 830584 cm³.
Next, we shall determine the mass of the silver. This can be obtained as follow:
Density (D) of silver = 10.5 g/cm³
Volume of the silver = 830584 cm³.
Mass of silver =.?
Density = mass /
10.5 = mass of silver /830584
Cross multiply
Mass of silver = 10.5 × 830584
Mass of silver = 8721132 g
Finally, we shall convert the mass of silver, 8721132 g to kilogram (kg). This can be obtained as follow:
1000 g = 1 Kg
Therefore,
8721132 g = 8721132 g / 1000 g × 1 Kg
8721132 g = 8721.132 Kg
Therefore, the mass of each cube of silver is 8721.132 Kg
what is the volume occupied by 6.022 X 10*23molecules of any gas at STP.
The class measured the density of a copper block to be 8.6 +/-0.2 g/cm3 at the 95% confidence interval with a standard deviation of 0.4 g/cm. The true density of copper is 8.96 g/cm3.
a. What is the high and low number of the confidence interval range? Does the true value fall within the confidence interval?
high:
low:
within range?
b. What is the high and low of the standard deviation range? Does the true value fall within the standard deviation?
high:
low:
within range?
Answer: kindly check explanation
Explanation:
Given the following :
Measured density of copper block:
8.6+/-0.2 g/cm3
True density = 8.96g/cm3
Standard deviation = 0.4g/cm
a. What is the high and low number of the confidence interval range?
High : 8.6 + 0.2 g/cm3 = 8.8g/cm³
Low : 8.6 - 0.2 g/cm3 = 8.4g/cm³
Does the true value fall within the confidence interval? NO
Actual density = 8.96g/cm³ doses not lie in between (8.4 - 8.8)g/cm³
B.) High and low of the standard deviation range?
High = 8.6 + 0.4 = 9.0g/cm³
Low = 8.6 - 0.4 = 8.2g/cm³
Value falls within range of the true density value of copper block.
8.96g/cm³ falls in-between (8.2-9.0)g/cm³
You left a glass full of water by a window in your house in the morning. Three hours later you walk by the glass, and the water level is significantly lower than it was in the morning. You have made the observation that the water level in the cup is lower. Then, you ask the following question: “Why is the water level in the cup lower?” What is a possible hypothesis you could make?
How does accuracy and precision impact your life
Explanation:
Accuracy refers to the closeness of a measured value to a standard or known value. For example, if in lab you obtain a weight measurement of 3.2 kg for a given substance, but the actual or known weight is 10 kg, then your measurement is not accurate. In this case, your measurement is not close to the known value.
Precision refers to the closeness of two or more measurements to each other. Using the example above, if you weigh a given substance five times, and get 3.2 kg each time, then your measurement is very precise. Precision is independent of accuracy. You can be very precise but inaccurate, as described above. You can also be accurate but imprecise.
For example, if on average, your measurements for a given substance are close to the known value, but the measurements are far from each other, then you have accuracy without precision.
A good analogy for understanding accuracy and precision is to imagine a basketball player shooting baskets. If the player shoots with accuracy, his aim will always take the ball close to or into the basket. If the player shoots with precision, his aim will always take the ball to the same location which may or may not be close to the basket. A good player will be both accurate and precise by shooting the ball the same way each time and each time
Humans breathe about 500 mL of air per breath and take about 12 breaths per minute during normal activities. If a person is exposed to an atmosphere containing benzene at a concentration of 10 ppm (by volume), how many grams of benzene will be deposited in the lungs during an 8-hour shift if all the benzene that enters remains in the lungs
Answer:
mass of benzene in the lungs = 28.8 g of benzene
Explanation:
Volume of air breathed per hour = 500 mL * 12 * 60 = 360000 ml = 360 Litres of air
In 8 hours, volume of breathed air = 360 L * 8 = 2880 Litres of air
Concentration of benzene in air = 10 ppm
Note: 1 ppm = 1 mg per liter (mg/L)
10 ppm = 10 mg/L
Therefore, mass of benzene in the lungs in an 8-hour shift = 10 mg/L * 2880 L
mass of benzene in the lungs = 28800 mg
Converting to grams = 28800/1000
mass of benzene in the lungs = 28.8 g of benzene
A cannonball made of iron has a volume of 110. cm3. What is the mass, in kilograms, of the cannonball?
Answer:
1 cubic centimeter (cu cm) = 0.001 kilogram (kg)
110cm³ =110*0.001=0.11kg
Explanation:
The volume has been the space occupied by the object and substances and uses the derived units. The mass of the iron ball with a volume of 110 cubic centimeters is 0.11kg.
What is volume?
Volume has been the three-dimensional space that an object has been using in space. The volume can be measured differently for the various states of matter in various units. Volume is the physical parameter to measure the states of matter.
The estimation of the volume can be given by density or mass and has been expressed by the various units like liters, milliliters, cubic meters, cubic centimeters, kiloliters, cubic decimeters, gallons, etc.
The unit cubic centimeter can be converted into kilogram (kg) as:
1 cubic centimeter = 0.001 kilogram
Given,
The volume of a cannonball made of iron = 110 cubic centimeters
The unit conversion from cubic centimeter to kg is shown as:
1 cubic centimeter = 0.001 kg
110 cubic centimeters = 0.11 Kg
Therefore, 0.11 kilogram is the mass of a cannonball made of iron.
Learn more about volume, here:
https://brainly.com/question/13807002
#SPJ2
Given that the specific heat of chromium is 0.455J/g∙K find the final temperature after 35.9J of energy is removed from 11.7g of chromium at 28.5°C.
Answer:
[tex]T_2=35.2\°C[/tex]
Explanation:
Hello,
In this case, since the heat is computed in terms of mass, specific heat and temperature as follows:
[tex]Q=mCp(T_2-T_1)[/tex]
In such a way, for the given heat, we obtain the following temperature:
[tex]T_2=T_1+\frac{Q}{mCp}\\ \\T_2=28.5\°C+\frac{35.9J}{11.7g*0.455\frac{J}{g\°C} }\\ \\T_2=35.2\°C[/tex]
Best regards.
What is 2.1 x 10^6 + 6.2 x 10^7 in scientific notation
Answer:
2100000 + 62000000
Explanation:
You move the decimal place to the right or left acording to the exponent (right if the exponent in positive, left of the exponent in negative.) Ex: if you're solving for 6.2*10^7 you move the decimal 7 places to the right.
Hope this helped,
-Kiddoo :)
What mass of aluminum has a total nuclear charge of 3.0 C?Aluminum has atomic number 13. Suppose the aluminum is all of the isotope with 14 neutrons.
Answer:
The value is [tex]m = 6.48*10^{-5} \ g [/tex]
Explanation:
From the question we are told that
The total nuclear charge is [tex]Q_t = 3.0 \ C[/tex]
The atomic number is [tex]n = 13[/tex]
The number of neutrons is [tex]n = 14[/tex]
Generally the number of protons is mathematically represented as
[tex]N_p = \frac{Q_t}{p}[/tex]
Here p is the charge on a proton with the value [tex]p = 1.60 *10^{-19} \ C[/tex]
=> [tex]N_p = \frac{3}{p}[/tex]
=> [tex]N_p = \frac{3}{1.60 *10^{-19} }[/tex]
=> [tex]N_p = 1.875*10^19 \ protons [/tex]
Generally the number of atoms present is mathematically represented as
[tex]N_a = \frac{N_p}{n }[/tex]
=> [tex]N_a = \frac{ 1.875*10^19}{13}[/tex]
=> [tex]N_a = 1.44*10^{18} \ atoms [/tex]
Generally the number of moles of atom present is mathematically represented as
[tex]N = \frac{N_a}{A_n }[/tex]
Here [tex]A_n[/tex] is the Avogadro's number with a constant value
[tex]A_n = 6.023*10^{23}[/tex]
So
[tex]N = \frac{1.44*10^{18}}{6.023*10^{23} }[/tex]
=> [tex]N = 2.4*10^{-6} \ mol[/tex]
Generally the total mass is mathematically represented as
[tex]m = N * M[/tex]
Here M is the molar mass of aluminum with
[tex]M = 27 \ g/mol[/tex]
So
[tex]m = 2.4*10^{-6} * 27[/tex]
[tex]m = 2.4*10^{-6} * 27[/tex]
[tex]m = 6.48*10^{-5} \ g [/tex]
The mass of aluminum has a total nuclear charge of 3.0 C is 6.45 * 10⁻⁵ g
Number of protonsNumber of protons = nuclear charge/charge on protonnuclear charge = 3.0 C
mass of proton = 1.60 * 10⁻¹⁹ C
Number of protons = 3.0/1.60 * 10⁻¹⁹ C
Number of protons = 1.875 * 10¹⁹ protons
Number of atomsNumber of atoms = number of protons /atomic numberatomic number = 13
Number of atoms = 1.875 * 10¹⁹/13
Number of atoms = 1.44 * 10¹⁸ atoms
Number of moles of atomsMoles of atoms = number of atoms / 6.02 * 10²³moles of atoms = 1.44 * 10¹⁸/ 6.02 * 10²³
moles of atoms = 2.39 * 10⁻⁶ moles
Mass of aluminummass = number of moles * molar massmolar mass of Aluminum is 27 g
mass of aluminum = 2.39 * 10⁻⁶ * 27
mass of aluminum = 6.45 * 10⁻⁵ g
Therefore, the mass of aluminum has a total nuclear charge of 3.0 C is 6.45 * 10⁻⁵ g
Learn more about nuclear charge and atomic mass at: https://brainly.com/question/14783477
https://brainly.com/question/14227831
The temperature at which carbon dioxide sublimes is about 195 K. What is this
temperature in units of degrees Celsius?
-78° Celsius is the temperature in units of degrees Celsius.
What is temperature?Temperature is the measure of hotness or coldness expressed in terms of any of several scales, including Fahrenheit and Celsius.
195 Kelvin = 195 - 273.15 = -78.15 Celsius.
-78° Celsius is the temperature in units of degrees Celsius.
Learn more about temperature here:
https://brainly.com/question/23411503
#SPJ2
What is a nebula? ...........................
a cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter.
a clouded spot on the cornea causing defective vision.
Hope this helped
Answer:
A cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter.
Explanation:
What particle(s) of an atom would NOT found in the nucleus?
Electrons
proton
neutron
neutrons and electrons
Answer:
Electrons, they circle the nucleus.
Which statement describes a property that is unique to metalloids?
Metalloids are shiny.
Metalloids are semiconductive.
Metalloids are solid.
Metalloids are brittle.
Answer:
Metalloids are semiconductive.
Explanation:
Answer: Metalloids are semiconductive.
What is an example of a physical change?
A. having less ash than the paper that was burned to form it
B. ice forming and then melting back into water
C. rust having a different identity than the iron it forms on
D. the irreversible reaction of vinegar and baking soda
What one would you guys choose?
Answer:
B is correct answer
Explanation:
Answer:
B.
Explanation:
Which statement best describes the polarity of SCL4F2?
a. The molecule is always polar.
b. The molecule s always nonpolar.
c. Depending on the arrangement of outer atoms, this molecule could be polar or nonpolar.
Answer: Depending on the arrangement of outer atoms, this molecule could be polar or nonpolar.
Explanation:
Polarity is when the electric charge that is leading to a molecule is being separated.
The polarity of SCL4F2 can either be polar or non polar and this depends on the arrangement of outer atoms. It is the arrangements of these outer atoms that'll help in the determination of its polarity.
The molecule SCl4F2 could be polar or nonpolar depending on the arrangement of outer atoms.
The molecule SCl4F2 could have different arrangements of outer atoms. That means that there are two possible arrangements of the molecule. Depending on which arrangement the outer Cl and F atoms have, the molecule cold be polar or nonpolar.
In the arrangement of SCl4F2 which could be polar is the one in which the dipoles in the molecule do not cancel out. In the other arrangement, the dipoles cancel out and the molecule is nonpolar.
Learn more: https://brainly.com/question/1340582
An open-topped tub is filled completely to the top edge with solid ice. What will happen when the ice melts?
A)
The tub will overflow.
B)
In the process of melting, 9 percent of the water will be converted to water vapor.
C)
The level of the water will be lower than the edge of the tub.
D)
There will be no change in the level of the tub.
Answer:
d
Explanation:
Answer:
B
Explanation:
Jack has a rock. The rock has a mass of 14 g and a volume of 2 cm3. What is the density of the rock? * 0 7 ml O 28 g/cm3 07 g/cm3 O 1/7 g/cm3
Answer:
The answer is
7.0 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question
mass of rock = 14 g
volume = 2 cm³
The density of the rock is
[tex]density = \frac{14}{2} \\ [/tex]
We have the final answer as
7.0 g/cm³Hope this helps you
Consider a closed container of gas that is a mixture of 30% CO2 and 70% N2 at room temperature 20°C. The gases are in thermal equilibrium with one another. a) Which has the higher kinetic energy, the average CO2 or N2 molecule? b) What is that root-mean-square velocity of a CO2 molecule? For reference, a carbon atom has 6 protons, a nitrogen atom has 7 protons, and an oxygen atom has 8 protons.
Answer:
a. the kinetic energy will be the same.
b. [tex]\mathbf{\overline v = 407.65 \ m/s}[/tex]
Explanation:
The kinetic theory deals with how the arrangement of particles of a substance determines the properties that substance will possess and the state in which it is likely to be found under a given set of conditions. From the postulates of the kinetic theory of gases, The average kinetic energy of the gas molecules is a measure of the temperature of the gas molecules, This implies that the kinetic energy is dependent on the temperature.
i.e
[tex]K.E = \dfrac{3}{2} \ KT[/tex]
where ;
K = Boltzmann Constant
Since the given gases are in thermal equilibrium, therefore, the kinetic energy will be the same.
b).
The root mean square velocity of CO2 molecule is represented by the equation :
[tex]\overline v = \sqrt{\dfrac{3RT}{M_m}}[/tex]
[tex]\overline v = \sqrt{\dfrac{3\times 8.314 \ J/K /mole \times (293.15 \ K ) }{44 \times 10^{-3} \ kg / mol}}[/tex]
[tex]\overline v = \sqrt{\dfrac{7311.7473 }{44 \times 10^{-3} }}[/tex]
[tex]\overline v = \sqrt{166176.075 \ m/s}[/tex]
[tex]\mathbf{\overline v = 407.65 \ m/s}[/tex]
which alkene represents the correct starting material phg?
Explanation:
The pH is larger than 7.
The relationship between pH and pOH is
pH + pOH = 14
if something is base, it's pH is greater than 7.
it's pOH is between 0 and 7.
Which is an example of pure chemistry? a. shape of a soybean plant b. chemicals containing carbon c. finding an antidote
In the reaction between Li and O, there is a transfer of electrons making an ionic bond. In the bond, lithium would be a (n) because it an electron, and oxygen would be an) because it electrons. O A anion, loses, cation, gains B cation, gains, anion, loses Oc cation, loses, anion, gains O D anion, gains, cation, loses INTL 5
Answer:
C) cation, loses, anion, gains
Explanation:
Lithium is a metal from Group 1, so it has 1 valence electron. Thus, it loses 1 electron to complete its octet and form the cation Li⁺.
Oxygen is a nonmetal from Group 16, so it has 6 valence electrons. Thus, it gains 2 electrons to complete its octet and form the anion O²⁻.
In the reaction between Li and O, there is a transfer of electrons making an ionic bond. In the bond, lithium would be a cation because it loses an electron, and oxygen would be an anion because it gains 2 electrons.
How many moles of calcium are in 5.82g of calcium?
Answer:
0.024951344877489 mole.
Explanation:
y
Is it possible to produce a blood type AB from blood type A and B
Answer:
Yes, it is possible to produce a blood type AB from blood type A and B.
Explanation:
If we were to do a hybrid cross and the mother's blood type was A, then her genotypes would be AA and AO. Additionally, if the father had type B blood, his genotypes would be BB and BO. From this, we can tell that the child's genotypes would have to be A, AB, B, O. Since AB is one of the choices, yes, it is possible to produce a blood type AB from blood type A and B.
The only times where you won't be able to produce a child with type AB is if both of the parents have type B blood and type O blood. Or if one parent has type B blood and the another has type O blood. Or if one parent has type AB and the other one has O blood. Or if both parents have type A blood.
help whats 2+2 i really don't know what the answer is i think it 1,250 but idk
Answer:
its 4
Explanation:
Answer:
4 is the answer
Explanation:
2 fingers plus 2 fingers is 4 fingers, Not 1,250
Exactly how many -OH groups are found in a 6 carbon alditol?
Answer:
The number of OH group found in found in a 6 carbon alditol is 6
Explanation:
The structure of a 6 carbon alditol is shown on the first uploaded image
Is condensation phyiscal change
Answer:
condensation is the change of the physical state of matter from the gas phase to the liquid phase :)
Explanation:
Answer:
Yes.
Explanation:
Condensation is the change of physical state of matter from gas to liquid.
3-An analysis that determines the relative amounts of analytes in numerical terms
A) Quantitative Analysis
B) Qualitative Analysis
C)Quantitative Synthesis
D) Qualitative Synthesis
Q1-(30 Marks) Choose the correct answer
Answer:
A.
Explanation:
Quantitative analysis.
Which of the following is a description of an exothermic reaction?
A. releases heat
B. reactants have less enthalpy than the products
C. ∆H is positive
D. gets cold
A description of an exothermic reaction is it releases heat. The correct option is A.
What is an exothermic reaction?An exothermic reaction is a reaction in which heat is released into the atmosphere. In these reactions, less energy is needed to start the reaction and the energy is released when bonds are made in the products. Delta H is always negative in these reactions.
Energy is always given off when the reaction happened, in the form of heat and light. Examples are burning of wood, melting of ice, combustion, corrosion, etc.
Thus, the correct option is A. releases heat regarding a description of an exothermic reaction.
Learn more about exothermic reaction, here:
https://brainly.com/question/18523044
#SPJ5
6. Un volumen de 1.0 mL de agua de mar contiene casi 4 x 10-12 g de Au. El volumen total de agua en los océanos es de 1.5 x 1021 L. Calcule la cantidad total de Au (en gramos) existente en los océanos y su valor total en dólares. ( 1 onza = $ 948)
Answer:
The total amount of Au is $ [tex]2.0\times10^{24}[/tex]
Explanation:
Given that,
Mass of 1.0 ml of Au [tex]m=4\times10^{-2}\ g[/tex]
Total volume of water in oceans [tex]V=1.5\times10^{21}\ L[/tex]
We need to calculate the volume in ml
Using given volume
[tex]V=1.5\times10^{21}\times1000\ mL[/tex]
[tex]V=1.5\times10^{24}\ mL[/tex]
We need to calculate the total mass of Au
Using given data
[tex]1\ ml\ volume = 4\times10^{-2}\ g[/tex]
[tex]1.5\times10^{24}\ ml=4\times10^{-2}\times1.5\times10^{24}[/tex]
So, The total mass of Au is [tex]6\times10^{22}\ g[/tex]
The mass will be in ounce,
[tex]Mass=0.035274\times6\times10^{22}[/tex]
[tex]Mass=2.12\times10^{21}\ ounce[/tex]
The total amount of the Au Will be
[tex]Total\ amount=2.12\times10^{21}\times948[/tex]
[tex]Total\ amount=2.0\times10^{24}[/tex]
Hence, The total amount of Au is $ [tex]2.0\times10^{24}[/tex]