Answer:
[tex]\large \boxed{0.012 \%}[/tex]
Explanation:
Data:
Solution 1: V₁ = 50.0 mL; c₁ = 0.05 mol·L⁻¹
Solution 2: V₂ = 100 mL; c₂ = 0.02 mol·L⁻¹
NaCl : ρ = 2.1 g/mL
1. Solution 1
(a) Moles of NaCl
[tex]n = \text{50.0 mL} \times \dfrac{\text{0.05 mmol}}{\text{1 L}} = \text{2.5 mmol}[/tex]
(b) Mass of NaCl
[tex]m = \text{2.5 mmol} \times \dfrac{\text{58.5 mg}}{\text{1 mmol}} = \text{150 mg} = \text{0.15 g}[/tex]
(c) Volume of NaCl
[tex]V = \text{0.15 g} \times \dfrac{\text{1 mL}}{\text{2.1 g}} = \text{0.070 mL}[/tex]
(d) Volume of water
V = 50.0 mL - 0.070 mL = 49.9 mL
(e) Mass of water
[tex]\text{Mass} = \text{49.9 mL} \times \dfrac{\text{1.00g}}{\text{1 mL}} = \text{49.9 g}[/tex]
2. Solution 2
(a) Moles of NaCl
[tex]n = \text{100 mL} \times \dfrac{\text{0.02 mmol}}{\text{1 mL}} = \text{2.0 mmol}[/tex]
(b) Mass of NaCl
[tex]m = \text{2.0 mmol} \times \dfrac{\text{58.5 mg}}{\text{1 mmol}} = \text{120 mg} = \text{0.12 g}[/tex]
(c) Volume of NaCl
[tex]V = \text{0.12 g} \times \dfrac{\text{1 mL}}{\text{2.1 g}} = \text{0.053 mL}[/tex]
(d) Volume of water
V =100 mL - 0.055 mL = 100 mL
(e) Mass of water
[tex]\text{Mass} = \text{100 mL} \times \dfrac{\text{1.00 g}}{\text{1 mL}} = \text{100 g}[/tex]
3. Combined solutions
(a) Mass of NaCl
Mass of NaCl = 0.015 g + 0.012 g = 0.018 g
(b) Mass of water
Mass of water = 49.9 g + 100 g = 150 g
(c) Mass percent
[tex]\text{Mass percent} = \dfrac{\text{Mass of component}}{\text{Total mass}} \times \, 100 \,\%\\\\\text{Mass \% NaCl} = \dfrac{\text{0.018 g}}{\text{150 g}}\times \, 100 \% = \mathbf{0.012 \%}\\\\\text{The mass percent of NaCl is $\large \boxed{\mathbf{0.012 \, \%}}$}[/tex]
This is how osmium appears in the periodic table. Rounded to the nearest whole number, how many neutrons, on average, are in an atom of osmium?
76
114
190
266
Answer:
114
Explanation:
bottom number minus top number. just did the test
112,300 joules heat is transferred when 240 g of a
metal sample is cooled from 880 °C to 13 °C. What
is the specific heat of this metal?
Answer:
0.54 J/goC
Explanation:
Recall that we define the heat transferred as ;
H= mcθ
Where;
H= heat transferred = 112300J
m= mass of the metal= 240g or 0.24 Kg
c= specific heat capacity of the metal = the unknown
θ= change in temperature = (880°C-13°C) = 867°C
Substituting values and making the specific heat capacity the subject of the formula;
c= H/mθ
c= 112300/ 240×867
c= 0.54 J/goC
Hence, the specific heat capacity of the metal is 0.54 J/goC.
Fabric is made of ___
Answer:
Fabric is made of cotton.
Explanation:
Hope that helps :)
Answer:
Hey mate your answer is
cotton
hope it helps you
mark as brainlist
Which of the following represents C 4 H 10
Answer:
B
Explanation:
Option be is the only molecular structure with 4 carbon molecules and 10 hydrogen molecules
difference between velocity and acceration
What volume (in liters) does 2.895 moles of oxygen occupy at stp?
Answer:
64.9 L
Explanation:
pls mark as brainliest
write an ionic equation of hydrogen peroxide reacting with sodium sulphite
Answer:
Na2SO3 + H2O2 = Na2SO4 + H2O
The ionic equation of hydrogen peroxide reacting with sodium sulphide is Na₂SO₃ + H₂O₂ = Na₂SO₄⁻ + H₂O⁺.
What is an ionic equation?A chemical equation known as an ionic equation expresses the constituents in an aqueous solution as dissociated ions. The ionic equation is written by using charge in them.
An example is "NaCl" is "Na⁺ + Cl⁻".
To write an ionic equation, we should write by dissolving all soluble ionic chemicals into their corresponding ions. To demonstrate that an ion is present in the solution, it should be displayed with its charge and an (aq). There is also a use of coefficient.
The reaction should be written as:
HS₂O₄ → 2H+ + (SO₄)²⁻
NaOH → Na+ + (OH)-
Na₂SO₄ → 2Na+ + (SO₄)²⁻
H2O exists in the molecular form
So we get 2H+ + (SO₄)²⁻ + 2Na+ + 2(OH)- →2Na+ + (SO₄)²⁻ + 2H₂O
Thus, the ionic equation is Na₂SO₃ + H₂O₂ = Na₂SO₄ + H₂O.
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Ethene is a useful substance that can form polymers. It has a melting point of 169°C and a boiling point of 104°C. At which temperature would ethene be a liquid?
Answer:
-169°C to -104°C
Explanation:
Ethene, also known as ethylene exists in solid, liquid and gaseous states. Ethene is an aliens with condensed structural formula C2H4. Athens is a colourless gas. It is flammable and is also a sweet smelling gas in its pure form. It is the monomer in the production of polyethylene which is of great importance in the plastic industry. In agriculture, it is used to induce the ripening of fruits. It can be hydrated in order to produce ethanol.
The liquid range of ethene refers to the temperatures at which ethene is found in the liquid state of matter. It is actually the difference between the melting point and the boiling points of ethene. Hence the liquid range of ethene is -169°C to -104°C
Group 2 in the penodic table contains the elements beryllium (Be), magnesium (Mg) , calcium (Ca) , strontium (Sf) )barium (Ba)and radium (Ra) What characteristic do these elements share ?
Answer:
They are all alkali earth metals.
Explanation:
Their valence shell each has 2 electrons. Also, they are all shiny, silvery-white, somewhat reactive metals at standard temperature and pressure. They form alkaline solutions, hydroxides, when reacting with water and their oxides are found in the earth’s crust.
Answer:
magnesium (Mg)
Explanation:
How many electrons in mole will discharge
2g of Copper 2 ions
Explanation:
96.485 columbs=1 faraday will
deposit 64/2g= 32 g cu ion
therfore it will require
96,485 ×2/32 =? coulombs or 1/16 of
Faraday= 1 / 16 mole of electrons .
What best describes the motion of iron atoms in solid iron?
Answer:
Vibration.
Explanation:
Answer:
vibration best describes it
Explanation:
(a) Complete the following sentences for an atom of uranium-238. (2)
mass number:
number of protons:
number of neutrons:
number of electrons:
how long was all the matter in the universe theorized to be compressed into a minuscule scalding mass?
Answer:
10⁻³⁶ s
Explanation:
There is much speculation, but many scientists believe the universe started expanding about 10⁻³⁶ s after the Big Bang.
Consider the unbalanced chemical equation HBr + B = BBr3 + H2. When
coefficients are added to balance the equation, which two substances will
have a coefficient of 2?
D A. H2
B. HBr
C. BBrg
D D B
Answer:
B and BBr3
Explanation:
1) 3HBr + B = BBr3 + H2 (double all equation because H2)
2) 6HBr + 2B = 2BBr3 + 3H2
how does the atomic mass of oxygen becomes 16??? pls answer ill mark u as brainliest
Answer:
this is the answer
Explanation:
If someone tells Atomic mass of oxygen is 16, then it means that One the mass of an atom of a oxygen expressed in atomic mass units is 16 It is approximately equivalent to the number of protons and neutrons in the atom of oxygen (the mass number) or to the average number allowing for the relative abundances of different isotopes of oxygen.
Atomic mass Of oxygen is 15.99u or 15.99 amu.
And the mass no. Of oxygen is 16 because total no. Of protons and neutrons (in oxygen 16) is 16.
8 protons+ 8neutrons
So we can say that mass no. And atomic mass are different things.
Then, the atomic mass of oxygen is not 16 rather 15.99amu or 15.99u
Which sentence best explains the movement of the oxygen molecules over time
Answer:
this option is the correct they move to an area with lower oxygen concentration because gas molecules can pass through semi-permeable and do not need transport proteins for the movement
Explanation:
i hope this will help you
can confirm that
They move to an area with a lower oxygen concentration
if the correct answer :)))
Explanation:
ape-x
give some examples from your surroundings where you have observed a=osmosis b=diffusion in gases 3=diffusion in liquids describe these phenomena with the help of pictures / diagram.
Answer: The phenomenon of osmosis can be seen in the surrounding as the when the raisins are put into water overnight. The water enters the raisins and it swells.
The osmosis can be defined as the biological phenomenon by which the water or any other liquid enters from an area of its higher concentration to an area of its lower concentration via semi permeable membrane.
Diffusion can take place in between gases and in between gases and liquid.
Exchange of gases in the lungs is an example of diffusion in liquids and burning an incense stick in the room is an example of diffusion in gases.
CH₂ - CH₂ - O-CH₂
what is it's IUPAC name?
I need help I don’t really get it
Answer:
The answer is 17.75%.
Explanation:
We are given [tex]NH_{3}[/tex] (ammonia) as a chemical formula. We want to find the percent composition of the formula.
We are given the atomic masses of each element: [tex]H = 1.008 amu[/tex] and [tex]N = 14.01 amu[/tex]. Then, we need to find out how many atoms are present of each element in the compound.
N has one atom (no subscript present). H has three atoms (subscript of 3 is present).
Now, we simply multiply the masses of each element by the number of atoms present of that element.
[tex]H = 1.008amu * 3atoms = 3.024amu[/tex]
[tex]N = 14.01amu * 1 atom = 14.01 amu[/tex]
Then, we add up those products to get the mass of the formula.
[tex]3.024amu + 14.01amu = 17.034amu[/tex]
Finally, we divide the masses of each element by the mass of the formula to get the percentages of each element present in the compounds.
For hydrogen:
[tex]\frac{3.024amu}{17.034 amu} =0.1775[/tex]
[tex]0.1775 * 100 = 17.75[/tex]
Hydrogen atoms account for 17.75% of the compound.
For nitrogen:
[tex]\frac{14.01amu}{17.034amu} = 0.8225[/tex]
[tex]0.8225 * 100 = 82.25[/tex]
Nitrogen atoms account for 82.25% of the compound.
For an extra step, add up the percentages to make sure you get within 100 ± 0.01. Otherwise, you may have rounded incorrectly or miscalculated somewhere within your work.
Hope this helps!
i. Give two differences between a physical change and a chemical change. ii. Explain whether condensation of water vapor is a physical or a chemical change. iii. Write word equations for the following reactions: a. Breaking down/ electrolysis of water b. synthesis of water c. decomposition of sugar d. photosynthesis in plants
Answer:
Explanation:
1) Chemical change :
It is permanent change.
Heat or energy is given out during the process
Physical change :
It is a temporary change.
Heat or energy in not given out during the process.
2) Condensation of water vapour is a physical change.
hope this helps
plz mark it as brainliest!!!!!!!
Answer:
i. The difference between physical and chemical change is that a physical change merely changes the shape and size of the substance while a chemical change produces altogether new substance.
ii condensation of water vapour is a physical change
Explanation:
How does temperature affect the speed with which the solute dissolves? Higher temperature increases the speed of solubility. Lower temperature increases the speed of solubility. A constant temperature increases the speed of solubility. A variable temperature increases the speed of solubility. HELP 17 POINTS
Answer:
higher temperatures increase the speed of solubility
Explanation:
This is because if the temperature of liquid is high and you place a solute inside it dissolves faster than a low temperature
Higher temperature increases the speed of solubility affect the speed with which the solute dissolves. Therefore, option A is correct.
What is solubility ?The term solubility is defined as the maximum amount of a substance that will dissolve in a given amount of solvent at a specific temperature.
Based on the concentration of solute dissolves in a solvent, solutes are divided into highly Soluble, sparingly Soluble or insoluble substance.
When a solvent is heated, the molecules gain kinetic energy. Because of the increased rapid motion, the solvent molecules collide with the solute more frequently and with greater force. Both factors accelerate the solute's dissolution.
This is because if the temperature of the liquid is high and a solute is placed inside, the solute dissolves faster than if the temperature is low.
Thus, option A is correct.
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how many grams of aluminum are required to produce 8.70 moles of aluminum chloride
Answer:
234.9 grams
Explanation:
Hope this helps
In general, atmospheric pressure is greatest near Earth's surface and ____ as you move upward away from sea level.
(decreaes
(doubles
(stays the same
(increaes
If a box has a forward force of 10N being applied to it, and a backward force of 220N. What is the resultant force?
Answer:
210
Explanation:
according to vectors since they are in two different direction u minus them
F1 =10 F2=220
F1 has a forward direction
while f2 goes backward
Answer:
-210N
Explanation:
you say acting force minus opposing force 10N-220N= -210N
What is the electron configuration when the valence electrons are removed from each of the elements listed in the chart?
A.1s22s22p63s2
B.1s22s22p6
C.1s22s2
D.1s22s22p63s1
Answer:
A. 1s²2s²
B. 1s²
C. 1s²
D. 1s²2s²2p⁶
Explanation:
The valency electron is the outer electron of an element. The valency electron resides in the outermost region of the shell.
Using the general configuration for the first 20 elements 2 8 8 2 the valency electrons can be identified.
A. 1s²2s²2p⁶3s² . The valency electron here are 2p⁶ and 3s² . Removing the valency electron we have 1s²2s²
B. 1s² 2s² 2p⁶. After removing the valency electron the configuration will be 1s².
C.1s²2s². After removing the valency electron the configuration will be 1s²
D.1s²2s²2p⁶3s¹. Removing the valency electron the electron configuration will be 1s²2s²2p⁶
The partial pressures of the gases in a mixture are 0.00461 atm O2, 1.78 atm
N2, and 0.975 atm Ar. What is the total pressure of the mixture?
Answer: The total pressure of the mixture is 2.76 atm
Explanation:
According to Dalton's law, the total pressure is the sum of individual pressures.
[tex]p_{total}=p_A+p_B+p_C...[/tex]
Given : [tex]p_{total}[/tex] =total pressure of gases = ?
[tex]p_{O_2}[/tex] = partial pressure of oxygen = 0.00461 atm
[tex]p_{N_2}[/tex] = partial pressure of nitrogen = 1.78 atm
[tex]p_{Ar}[/tex] = partial pressure of argon = 0.975 atm
putting in the values we get:
[tex]p_{total}=0.00461atm+1.78atm+0.975atm[/tex]
[tex]p_{total}=2.76atm[/tex]
Thus the total pressure of the mixture is 2.76 atm
Which of the following is the correct name for the compound MgBr2? A) Magnesium bromate B) Magnesium bromide C) Magnesium dibromide D) Magnesium (1) bromide
Answer:
It's A) magnesium bromide
Explanation:
The name for the compound MgBr2 is magnesium bromide. Mg is the symbol for magnesium, and Br is the symbol for bromine.
I Hope it will help
Sulfur dioxide is released when fossil fuels burn. What does sulfur dioxide cause? ASAP PLZ
Answer:
acid rain
Explanation:
When sulfur dioxide combines with water and air, it forms sulfuric acid, which is the main component of acid rain. Acid rain can: cause deforestation.
what is the percentage of nitrogen in the fertilizer urea ((nh2) 2co)
Answer:
You have 1680 grams of urea. It means (in it) there are 787 grams of nitrogen, 112 grams of hydrogen, 336 grams of carbon, and 448 grams of oxygen.
Explanation:
For the process 2SO2(g) + O2(g) Right arrow. 2SO3(g), Delta.S = –187.9 J/K and Delta.H = –198.4 kJ at 297.0 K are known. What is the entropy of this reaction? Use Delta.G = Delta.H – TDelta.S.
Answer:
The entropy of this reaction (ΔS) = -187.9 J/K
Explanation:
.Step : Data given
ΔS = -187.9 J/K
ΔH = -198.4 kJ
T = 297.0 K
Step 2: The balanced equation
2SO2(g) + O2(g) → 2SO3(g)
Step 3: Calculate the entropy
ΔG = ΔH - TΔS
⇒ΔG = the gibbs free energy
⇒ΔH = the change in enthalpy of the reaction = -198.4 kJ
⇒with T = the temperature = 297.0 K
⇒with ΔS = the change of entropy = -187.9 J/K
ΔG = -198400 kJ -297*(-187.9kJ/mol)
ΔG = -198400+55806.3
ΔG = - 142593.7 kJ = the gibbs free energy
The entropy of this reaction (ΔS) = -187.9 J/K
Answer:
C. -187.9 J/K
Explanation:
Entropy is just ΔS, which it gives you in the question as -187.9 J/K.