Mass : 846.268 g
Further explanationThe mole is the number of particles contained in a substance
1 mol = 6.02.10²³
Moles can also be determined from the amount of substance mass and its molar mass
[tex]\tt mol=\dfrac{mass}{MW}[/tex]
mass of Al₂O₃ :
MW 101,96 g/mol
mass=mole x MW
[tex]\tt 8.3\times 101.96=846.268~g[/tex]
Silver has a density of 10.5 g/cm³, and gold has a density of 19.3 g/cm³. Which would have a greater mass, 5 cm³ of silver or 5 cm³ of gold?
Gold have a greater mass
Further explanationDensity is a quantity derived from the mass and volume
Density is the ratio of mass per unit volume
The unit of density can be expressed in g/cm³ or kg/m³
Density formula:
[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]
ρ = density
m = mass
v = volume
mass of Silver :[tex]\tt mass=\rho\times V\\\\mass=10.5\times 5=52.5~g[/tex]
mass of Gold :[tex]\tt mass=\rho\times V\\\\mass=19.3\times 5=96.5~g[/tex]
The velocity of a car changes from 10 m/s east to 30 m/s east in 4 seconds.
What is the acceleration of the car?
A. 5 m/s2 east
B. 10 m/s2 west
c. 10 m/s2 east
D. 5 m/s2 west
Answer:
5m/s²
Explanation:
Given parameters:
Initial velocity = 10m/s due east
Final velocity = 30m/s due east
Time = 4s
Unknown:
Acceleration of the car = ?
Solution:
Acceleration is the rate of change of velocity with time.
Mathematically;
Acceleration = [tex]\frac{v - u}{t}[/tex]
v is the final velocity
u is the initial velocity
t is the time taken
Insert the parameters and solve;
Acceleration = [tex]\frac{30 - 10}{4}[/tex] = 5m/s²
How many moles of water would be produced from 3 moles of oxygen in the following reaction? Don’t forget to include units in your answer.
PLZHELP I'LL AWARD BRAINLIEST
Answer:
6 mol H₂O
General Formulas and Concepts:
Chemistry
StoichiometryExplanation:
Step 1: Define
RxN: 2H₂ + O₂ → 2H₂O
Given: 3 moles O₂
Step 2: Stoichiometry
[tex]3 \ mol \ O_2(\frac{2 \ mol \ H_2O}{1 \ mol \ O_2} )[/tex] = 6 mol H₂O
Step 3: Check
We are given 1 sig fig.
Our final answer has 1 sig fig, so no need to round.
If 42.389 g of Fe3Br2 is dissolved in enough water to give a total volume of 750 mL, what is the molarity of the solution
Answer:
[tex]M=0.173M[/tex]
Explanation:
Hello!
In this case, since the molarity of a solution is defined in terms of the moles of solute divided by the volume of the solution in liters and has units of mol/L or M:
[tex]M=\frac{n}{V}[/tex]
For the solute, Fe3Br2, which has a molar mass of 327.3430 g/mol, the moles in 42.389 g are:
[tex]n=42.389g*\frac{1mol}{327.3430g} =0.12949mol[/tex]
Thus, since the volume in liters is 0.750 L from those given 750 mL, the molarity turns out:
[tex]M=\frac{0.12949mol}{0.750L}\\\\M=0.173M[/tex]
Best regards!
10. What is the IUPAC name of this compound? CH3 -CH2-C =C-CH3
Answer:
2-pentene or pent-2-ene
A compound composed of 3.3% H, 19.3% C, and 77.4% O3.3% H, 19.3% C, and 77.4% O has a molar mass of approximately 60 g/mol.. What is the molecular formula of the compound?
Answer:
Molecular formula of the compound = H₂CO₃
Explanation:
First, the empirical formula of the compound is determined
Percentage by mass of each element is given as shown below:
H = 3.3% ; C = 19.9%; O = 77.4%
Mole ratio of the elements= percentage mass/ molar mass
H = 3.3/ 1 = 3.3
C = 19.3/12 = 1.6
O = 77.4/16 = 4.8
whole number ratio is obtained by dividing through with the smallest ratio
H = 3.3/1.6; C = 1.6/1.6; O = 4.8/1.6
H : C : O = 2 : 1 : 3
Empirical formula = H₂CO₃
Molecular formula/mass = n(empirical formula/mass)
60 = n(2*1 + 12*1 + 16*3)
60 = n(62)
n = 60/62 = 0.96
n is approximately = 1
Therefore, molecular formula of the compound = (H₂CO₃) * 1
Molecular formula of the compound = H₂CO₃
The molecular formula of a compound composed of 3.3% H, 19.3% C, and 77.4% O and a molar mass of approximately 60 g/mol is CH2O3.
HOW TO CALCULATE MOLECULAR FORMULA:
The molecular formula of an unknown compound can be calculated from the empirical formula. The empirical formula can be calculated as follows:C = 19.3% = 19.3gH = 3.3% = 3.3gO = 77.4% = 77.4gFirst, we calculate the number of moles in each element by dividing by their respective atomic mass. C = 19.3g ÷ 12g/mol = 1.61molH = 3.3g ÷ 1g/mol = 3.3molO = 77.4g ÷ 16g/mol = 4.84molNext, we divide by the smallest mole value. C = 1.61mol ÷ 1.61 = 1 H = 3.3mol ÷ 1.61 = 2.05O = 4.84mol ÷ 1.61 = 3.01Approximately, the empirical ratio of CHO is 1:2:3. Hence, the empirical formula is CH2O3. {CH2O3}n = 60g/mol{12 + 2 + 48}n = 6062n = 60n = 60 ÷ 62n = 0.968n = 1Therefore, the molecular formula of a compound composed of 3.3% H, 19.3% C, and 77.4% O and a molar mass of approximately 60 g/mol is CH2O3.Learn more at: https://brainly.com/question/21280037?referrer=searchResults
How does wavelength affect the pitch of a sound?
a. the shorter the wavelength, the lower the pitch
b. the longer the wavelength, the lower the pitch
c. the taller the wavelength, the lower the pitch
d. none of these
Answer:
D
Explanation:
because the higher the wavelength the shorter the pitch and the shorter the wavelength the higher the pitch
A 12.0 m hcl solution has a density of 1.18 g ml. What is the concentration of tthis solution in weight percent and moliarty?
Answer:
Percentage of HCL = 37.11 % (Approx)
Molarity = 16.17 m (Approx)
Explanation:
Given:
Molarity = 12.0 M of hcl
Density = 1.18 g/ml
Computation:
1L of hcl solution contains = 12 moles
Mass = Moles x Molar mass
Mass of HCl = 12 x 36.5
Mass of HCl = 438 g = 0.438 kg
Mass of 1 L solution = 1.18 x 1,000 ml
Mass of 1 L solution = 1180 g
Percentage of HCL = [438/1180]100
Percentage of HCL = 37.11 % (Approx)
Molarity = 12 / [1.18 - 0.438]
Molarity = 12 / [0.742]
Molarity = 16.17 m (Approx)
A 49 gram sample of an unknown metal requires 717 Joules of energy to heat it from 30.5◦C to 101◦C. What is the specific heat of this metal? Answer in units of J/g · ◦ C.
Answer:
The specific heat capacity of unknown metal is calculated using the following formula
Q=MC delta T where
Q= heat(862 j)
M= mass (17 g)
C= specific heat capacity=?
delta T = change in temperature ( 35-10= 25 c)
by making C the subject of the formula C=Q/m delta T
= 862 j/( 17 g x25 c) = 2.028 j/g/c
Explanation:
A balloon is filled to a volume of 1.50 L with 3.00 moles of gas at 25 °C. With pressure and temperature held constant, what will be the volume (in L) of the balloon if 0.80 moles of gas are added?
We know, when temperature and pressure is constant :
[tex]\dfrac{V_1}{n_1}=\dfrac{V_2}{n_2}[/tex] ....1)
[tex]n_1 = 3\ moles,\ V_1 = 1.50\ L[/tex]
[tex]n_2 = 3 + 0.80 = 3.80 \ moles[/tex]
Let, final volume is [tex]V_2[/tex].
Putting all values in equation 1), we get :
[tex]\dfrac{V_1}{n_1}=\dfrac{V_2}{n_2}\\\\\dfrac{1.50}{3}=\dfrac{V_2}{3.80}\\\\V_2 = \dfrac{1.50\times 3.80}{3}\\\\V_2 = 1.9\ L[/tex]
Therefore, volume (in L) of the balloon if 0.80 moles of gas are added is 1.9 L.
Hence, this is the required solution.
A 0.175 M solution of an enantiomerically pure chiral compound D has an observed rotation of +0.27° in a 1-dm sample
container. The molar mass of the compound is 133.0g/mol.
What is the specific rotation of D?
Answer:
The specific rotation of D is 11.60° mL/g dm
Explanation:
Given that:
The path length (l) = 1 dm
Observed rotation (∝) = + 0.27°
Molarity = 0.175 M
Molar mass = 133.0 g/mol
Concentration in (g/mL) = 0.175 mol/L × 133.0 g/mol
Concentration in (g/mL) = 23.275 g/L
Since 1 L = 1000 mL
Concentration in (g/mL) = 0.023275 g/mL
The specific rotation [∝] = ∝/(1×c)
= 0.27°/( 1 dm × 0.023275 g/mL )
= 11.60° mL/g dm
Thus, the specific rotation of D is 11.60° mL/g dm
How many moles of H20 are required to react completely with 7.30 moles of NO2?
3NO2(g) + H20(1)
NO(g) + 2HNO3(aq)
1.86 mol
2.19 mol
2.43 mol
6.12 mol
7.30 mol
Answer:
2.43 moles of water are required.
Explanation:
Given data:
Moles of H₂O required = ?
Moles of NO₂ present = 7.30 mol
Chemical equation:
3NO₂+ H₂O → NO + 2HNO₃
Now we will compare the moles of NO₂ and H₂O.
NO₂ : H₂O
3 : 1
7.30 : 1/3×7.30 = 2.43 mol
About 25% of the world's population lives:
in the United States
without access to energy
in industrialized areas
near nuclear power plants
Answer:
I believe it is "in industrialized areas"
Explanation:
According to Calvert Academy it says "Only 25% of the world's population lives in industrial areas. Hope this helps :)
A chemist conducts an experiment in which 2.0 L of hydrogen gas is collected over water at 1 atm and 298 K. Remember the pressure due to the hydrogen gas is 0.97 atm. Using the combined gas law, calculate the volume in L of the dry hydrogen gas at 273 K and a pressure of 1 atm.
Answer:
[tex]V_2=1.80L[/tex]
Explanation:
Hello!
In this case, since in this problem we can see that the volume, pressure and temperature are changing, considering that the vapor pressure of water at 0 °C or also 273 K is 0.006 atm, the pressure of dry hydrogen would be 0.99 atm, thus, we can write:
[tex]\frac{P_1V_1}{T_1} =\frac{P_2V_2}{T_2}[/tex]
Now, as we need the final volume V2, by solving for it, we write:
[tex]V_2=\frac{P_1V_1T_2}{T_1P_2}[/tex]
In such a way, we plug in the given data to obtain:
[tex]V_2=\frac{0.97atm*2.0L*273K}{298K*0.99atm}\\\\V_2=1.80L[/tex]
Which means that the underwent a compression.
Best regards!
Taking into account the combined gas law, the volume of the dry hydrogen gas at 273 K and a pressure of 1 atm is 1.78 L.
Gay Lussac's LawGay-Lussac's law states that when there is a constant volume, as the temperature increases, the pressure of the gas increases. And when the temperature is decreased, the pressure of the gas decreases.
Mathematically, this law indicates that the quotient between pressure and temperature is constant:
[tex]\frac{P}{T}=k[/tex]
Boyle's LawBoyle's law says that the volume occupied by a certain gaseous mass at constant temperature is inversely proportional to pressure.
Boyle's law is expressed mathematically as:
P× V = k
Charles's lawCharles's law states that for a given sum of gas at constant pressure, as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases. That is, temperature and volume are directly proportional.
In summary, Charles's law is a law that says that when the amount of gas and pressure are kept constant, the ratio that exists between the volume and the temperature will always have the same value:
[tex]\frac{V}{T}=k[/tex]
Combined gas lawCombined law equation is the combination of three gas laws called Boyle's, Charlie's and Gay-Lusac's law:
[tex]\frac{PxV}{T}=k[/tex]
Studying two different states, an initial state 1 and a final state 2, it is satisfied:
[tex]\frac{P1xV1}{T1}=\frac{P2xV2}{T2}[/tex]
This caseIn this case you know:
P1= 0.97 atmV1= 2 LT1= 298 KP2= 1 atmV2= ?T2= 273 atmReplacing in the combined gas law:
[tex]\frac{0.97 atmx2 L}{298 K}=\frac{1 atmxV2}{273 K}[/tex]
Solving:
[tex]\frac{0.97 atmx2 L}{298 K}\frac{273 K}{1 atm} =V2[/tex]
1.78 L= V2
In summary, the volume of the dry hydrogen gas at 273 K and a pressure of 1 atm is 1.78 L.
Learn more about the combined gas law:
https://brainly.com/question/4147359?referrer=searchResultsWhich of the following would be a clue that a rock is metamorphic?
A It has a complete fossil in it.
B It has gas bubbles.
с It is very soft.
D It has ribbon-like layers, or bands.
and have
more energy moving from left to right on the electromagnetic
Electromagnetic waves are
radiation diagram
shorter/less
o longer/more
shorter/more
longer/less
Answer:
longer/less
Explanation:
In moving from left to right on the electromagnetic diagram, the wavelength becomes longer and the energy lessens.
The electromagnetic diagram presents a spectrum of radiation.
The left most wave is the most energetic and the right most radiation is the least energetic. Also, as energy decreases from left to right, the frequency of the wave also decreases. But the wavelength increases or becomes longer.
Which of the following is a consequence of humans using fossil fuels?
O A. All of these
B. Rising sea level
C. Destruction of habitats
D. More severe storms
What type of wave is shown here?
:transverse wave
:longitudinal wave
What happens when two cars converge
Which of the following examples from everyday life are made possible or explained possible or explained by modern chemistry
Answer: Where is the folowing?
Explanation:
3. Which of the elements listed below would you expect to form ions with a positive one charge?
Chlorine
Lithium
Sodium
Magnesium
Answer:
Lithium and Sodium
Explanation:
How many atoms of Chlorine would there be in 6.8 mol of Cl?
Answer:
241.08039999999588
Explanation:
Calculate the molar mass of Al(CH3O2)3
Answer:
The molar mass and molecular weight of Al(CH3CO2)3 is 204.1136.
Explanation:
Answer:
168.1 g/mol
General Formulas and Concepts:
Chemistry
Reading a Periodic TableExplanation:
Step 1: Define
Al(CH₃O₂)₃
Step 2: Find molar masses
Molar Mass of Al - 26.98 g/mol
Molar Mass of C - 12.01 g/mol
Molar Mass of H - 1.01 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of Al(CH₃O₂)₃ - 26.98 + 3(12.01) + 9(1.01) + 6(16.00) = 168.1 g/mol
5. What is the speed (Velocity) of a cyclist who covers 10 km (convert to meters
first!) in 14 minutes and 30 seconds? Remember time must be in seconds first!
[tex]\mathfrak{\huge{\pink{\underline{\underline{AnSwEr:-}}}}}[/tex]
Actually Welcome to the Concept of the Kinematics.
Here, we know that, Velocity = Distance / Time,
So here, Distance = 10km = 10×1000 = 10000 metres.
, Time = 14 min 30 sec = 870 seconds,
so now, we get velocity as,
=> V = 10000 ÷ 870 => 11.49 m/s .
Hence, Velocity is 11.49 m/s.
Geckos and some other animals can climb smooth surfaces. Which of these explanations of this
observation do you think is most reasonable?
The gecko's feet are rough, which increases the friction with the surface.
The gecko's feet have tiny suction cups on them that stick to the surface
The gecko's feet secrete a sticky substance that helps them adhere to the surface
The gecko's feet contain molecules that are attracted to the molecules on the surface.
Answer:
The gecko's feet have tiny suction cups on them that stick to the surface.
Answer:
c) pillars
Explanation:
What is accretion?????
Answer:
the process of growth or increase, typically by the gradual accumulation of additional layers or matter.
Explanation:
Answer:
The process of growth or increase, typically by the gradual accumulation of additional layers or matter.
Explanation:
Match the description to the advancement
Answer:
i podwmk
Explanation:
What element in period 4 has the lowest ionization energy? noble gas, alkali metal, halogen or alkaline earth metal?
Answer:
alkali metal
Explanation:
The alkali metals in period 4 will have the lowest ionization energy of the elements in the period.
Across a period ionization energy increases progressively from left to right due to decreasing atomic radii caused by the increasing nuclear charge which is not compensated for by successive electronic shells.
Ionization energy is the energy needed to remove the most loosely bound electrons of an atom in the gas phase in the ground state. The measure of the readiness of an atom to lose an electron is the ionization energy.Down a group, it decreases.
The periodic table is the arrangement of the elements based on the atomic numbers. The elements of the alkali period have the lowest ionization energy.
What is ionization energy?Ionization energy or the potential is the amount of the potential needed by the molecule or the atom to remove the electron from their shells. The alkali metal elements have the lowest ionization energy.
The ionization potential of the elements increases from the left towards the right of the period due to the decrease in the atomic radii and decreases from top to bottom in a group.
In the period from left to right the atomic radius of the atoms decreases due to the increase in the nuclear charge of the atoms.
Therefore, option B. alkali metal has the lowest ionization energy.
Learn more about ionization energy here:
https://brainly.com/question/837763
Mitosis occurs during which phase?
Answer:
Prophase
Explanation:
Prophase is the first stage in mitosis, occurring after the conclusion of the G2 portion of interphase. During prophase, the parent cell chromosomes — which were duplicated during S phase — condense and become thousands of times more compact than they were during interphase.
In going from room temperature 25° to 35 the rate of a reaction doubles calculate the activation energy for the reaction
Answer:
52.9 KJmol-1
Explanation:
From;
log(k2/k1) = Ea/2.303 * R (1/T1 - 1/T2)
The temperatures must be converted to Kelvin;
T1 = 25° C + 273 = 298 K
T2= 35°C + 273 = 308 K
R= gas constant = 8.314 JK-1mol-1
Substituting values;
log 2 = Ea/2.303 * 8.314 (1/298 - 1/308)
Ea = 52.9 KJmol-1