Answer:
a. Approximately [tex]1.3\; \rm mL[/tex].
b. Approximately [tex]7.2\; \rm mL[/tex].
Explanation:
The unit of concentration "[tex]\rm M[/tex]" is equivalent to "[tex]\rm mol \cdot L^{-1}[/tex]", which means "moles per liter."
However, the volume of both solutions were given in mililiters [tex]\rm mL[/tex]. Convert these volumes to liters:
[tex]\displaystyle 45\; \rm mL = 45\; \rm mL \times \frac{1\; \rm L}{1000\; \rm mL} = 0.045\; \rm L[/tex].
[tex]\displaystyle 330\; \rm mL = 330\; \rm mL \times \frac{1\; \rm L}{1000\; \rm mL} = 0.330\; \rm L[/tex].
In a solution of volume [tex]V[/tex] where the concentration of a solute is [tex]c[/tex], there would be [tex]c \cdot V[/tex] (moles of) formula units of this solute.
Calculate the number of moles of [tex]\rm NaCl[/tex] formula units in each of the two solutions:
Solution in a.:
[tex]n = c \cdot V = 0.045\; \rm L \times 0.10\; \rm mol \cdot L^{-1} = 0.0045\; \rm mol[/tex].
Solution in b.:
[tex]n = c \cdot V = 0.330\; \rm L \times 0.074\; \rm mol \cdot L^{-1} = 0.02442\; \rm mol[/tex].
What volume of that [tex]3.4\; \rm M[/tex] (same as [tex]3.4 \; \rm mol \cdot L^{-1}[/tex]) [tex]\rm NaCl[/tex] solution would contain that many
For the solution in a.:
[tex]\displaystyle V = \frac{n}{c} = \frac{0.0045\; \rm mol}{3.4\; \rm mol \cdot L^{-1}} \approx 0.0013\; \rm L[/tex].
Convert the unit of that volume to milliliters:
[tex]\displaystyle 0.0013\; \rm L = 0.0013\; \rm L \times \frac{1000\; \rm mL}{1\; \rm L} = 1.3\; \rm mL[/tex].
Similarly, for the solution in b.:
[tex]\displaystyle V = \frac{n}{c} = \frac{0.02442\; \rm mol}{3.4\; \rm mol \cdot L^{-1}} \approx 0.0072\; \rm L[/tex].
Convert the unit of that volume to milliliters:
[tex]\displaystyle 0.0072\; \rm L = 0.0072\; \rm L \times \frac{1000\; \rm mL}{1\; \rm L} = 7.2\; \rm mL[/tex].
What is one property of most complex solid compounds?
A. low boiling point
B. high melting point
C. high temperature
D. low temperature
If 8.500 g CH is burned and the heat produced from the burning is added to 5691 g of water at 21 °C, what is the final
temperature of the water?
The final temperature = 36 °C
Further explanationThe balanced combustion reaction for C₆H₆
2C₆H₆(l)+15O₂(g)⇒ 12CO₂(g)+6H₂O(l) +6542 kJ
MW C₆H₆ : 78.11 g/mol
mol C₆H₆ :
[tex]\tt \dfrac{8.5}{78.11}=0.109[/tex]
Heat released for 2 mol C₆H₆ =6542 kJ, so for 1 mol
[tex]\tt \dfrac{0.109}{2}\times 6542=356.539~kJ/mol[/tex]
Heat transferred to water :
Q=m.c.ΔT
[tex]\tt 356.539=5.691~kg\times 4.18~kj/kg^oC\times (t_2-21)\\\\t_2-21=15\rightarrow t_2=36^oC[/tex]
The nurse discovers that one of her assigned clients is bleeding excessively from an abdominal incision. The nurse gives specific prescriptions to an unlicensed assistive personnel (UAP) to attend to the other clients and tells another nurse to call the primary health care provider immediately. In this situation, the nurse is implementing which leadership style?
What is the concentration, mass/volume percent (m/v), of a solution prepared from 30.gNaCl and 1.5 L of water?
The concentration, mass/volume percent (m/v) : 1.98%
Further explanation[tex]\tt \%m/v=\dfrac{mass~solute}{volume~of~solution}\times 100\%[/tex]
mass solute = mass of NaCl = 30 g
volume of solution = volume of water + volume of NaCl
volume of water = 1.5 L = 1500 ml
volume of NaCl :(density = 2.16 g/ml)
[tex]\tt V=\dfrac{30}{2.16}=13.8~ml[/tex]
volume of solution :
[tex]\tt 1500+13.8=1513.8~ml[/tex]
the concentration (%m/v) :
[tex]\tt \dfrac{30}{1513.8}\times 100=1.98\%[/tex]
-
How many different sublevels are in the second energy level?
A. 2
B. 1
C. 4
D. 3
SI
Answer:
A: 2
Explanation:
Level one has one sublevel, whereas a Level two has two sublevels.
what is the funny number
666
Explanation:
nhgytfghgtfgv
At 125 °C, 1 mol O₂ and 2 mol H₂ in a chamber have a total pressure of 3 atm. A current is run through the chamber, combining all the molecules into H₂O at constant volume. The pressure of the chamber, in atmospheres, is now:
Answer:
1.9998 atm
Explanation:
Balance the equation and then use PV=nRT to find the variable.
The final pressure of the chamber is 2 atm.
The given parameters;
Temperature of the gas, T = 125 ⁰CNumber of oxygen moles = 1Number of hydrogen moles, = 2Initial pressure of the gases, P₁ = 3 atmThe balanced chemical reaction of the given elements;
[tex]O_2 \ \ + \ 2H_2 \ \ ---> \ 2H_2O[/tex]
Initial number of moles of the gases, = 1 + 2 = 3 moles
Final number of moles of the product, = 2 moles
The final pressure of the chamber is calculated as follows;
[tex]PV = nRT\\\\\frac{P}{n} = \frac{RT}{V} \\\\\frac{P_1}{n_1} = \frac{P_2}{n_2} \\\\P_2 = \frac{P_1 n_2}{n_1} \\\\P_2 = \frac{3 \times 2}{3} \\\\P_2 = 2 \ atm[/tex]
Thus, the final pressure of the chamber is 2 atm.
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If you cross a purebred black fur (BB) parent with a purebred white fur
(bb) parent, all the offspring will be
Answer: Bb
Explanation:
The capital B (purbred black fur) is domaint the the lower case b(purebred white fur)
Bromine (Br) has ____ valence electrons. When it forms an ionic bond, it _____ one electron and has a charge of _____
Answer:
7 valence e-, obtain e-, negative
Determine the molarity of 1.2 mol KCl in 1.1 L of a solution?
Answer:
1.1 M
General Formulas and Concepts:
Molarity = moles of solute / liters of solutionExplanation:
Step 1: Define variables
1.2 mol KCL
1.1 L of solution
M = unknown
Step 2: Solve for Molarity
Substitute: M = 1.2 mol/1.1 LEvaluate: M = 1.09091Step 3: Check
We are given 2 sig figs. Follow sig fig rules.
1.09091 M ≈ 1.1 M
PLEASE HURRT I NEED HELP ASAP !!!!!!!!!!!!!!
Answer:
I think its b
Explanation:
well because thermal energy its connected to kidnetic energy
Calculate the pH of a solution with a [H 3 O + ]=5.6x10 -9 M.
Answer:
8.3
Explanation:
pH is the measure of the H+ or H30 (they r the same thing) ions in a solution. it is equal to -log[H+]. [H+]= Molar concentration of H+ ions.
What will occur if two reactant molecules collide but do not have the right alignment?
Answer: Collision theory explains why different reactions occur at different rates, and suggests ways to change the rate of a reaction. Collision theory states that for a chemical reaction to occur, the reacting particles must collide with one another. The rate of the reaction depends on the frequency of collisions. The theory also tells us that reacting particles often collide without reacting. For collisions to be successful, reacting particles must (1) collide with (2) sufficient energy, and (3) with the proper orientation.
Molecules must collide before they can react
This rule is fundamental to any analysis of an ordinary reaction mechanism. It explains why termolecular processes are so uncommon. The kinetic theory of gases states that for every 1000 binary collisions, there will be only one event in which three molecules simultaneously come together. Four-way collisions are so improbable that this process has never been demonstrated in an elementary reaction.
Explanation:hope this helped
If two reactant molecules collide but do not have the right alignment then formation of product does not takes place.
What is collision theory?Collision theory states that if reacting particles frequently collide without reacting. Reacting particles must collide with sufficient energy and the right orientation for collisions to be successful.
So it the two reactant molecules collide with each other without proper orientation then it will not convert into products.
Hence formation of product will not takes place if reactant does not collide with right allignment.
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Identify the common indicators that a chemical reaction has occurred.
a. A color change
b. A phase change
c. Precipitate being formed
d. A solid being dissolved
e. A change in temperature
f. Bubbles being produced
Answer:
a. A color change
c. Precipitate being formed
e. A change in temperature
f. Bubbles being produced
Explanation:
Two types of changes occur namely: physical changes and chemical changes. A physical change does not affect the chemical composition of the substance involved. Physical changes include change of state etc.
However, on the other hand, a chemical change alters the chemical composition of the substances involved, hence, leading to the formation of new product(s). It is also called a chemical reaction. Since a new product is formed from the alteration of the chemical nature of the reacting substances, the following changes or indicators will be present or evident in a chemical reaction:
- color change of substance
- Precipitate being formed i.e. solid deposit
- A change in temperature
- Bubbles being produced (evolution of gas)
Which model shows a molecule of a substance that is made up of three elements
Answer:
c or d
Explanation:
i tried a and it was wrong. its not B. and i cant see the rest. its the one that looks like a catipillar tho
Answer:
Its not A or B
Explanation:
Syrup used for hummingbird feeders is commonly 25% sucrose (C12H22O11) by mass. if you wish to make 1.0 kg of this soltion, what calculate the quantitity of sucrose and the quantitiy of water that you should use.
Calculate the molality (m) of the 25% sucrose solution in the question above,
The density 25% a sucrose solution at room temperature is 1.10 g/mL. calculate the molarity (M) of the 25% sucrose solutino.
Answer:
m
Explanation:
Given that 10.00mL of 0.1894M CH3COOH was titrated with 0.2006M NaOH in this experiment, calculate the volume, in mL, of NaOH required
Answer:
[tex]V_{base}=9.442mL[/tex]
Explanation:
Hello!
In this case, when acetic acid is titrated with sodium hydroxide, the following chemical reaction is carried out:
[tex]CH_3COOH+NaOH\rightarrow CH_3COONa+H_2O[/tex]
Whereas there is a 1:1 mole ratio between the acid and the base, which means that at the equivalence point we evidence:
[tex]n_{acid}=n_{base}[/tex]
Which in terms of volumes and concentrations is written as:
[tex]M_{acid}V_{acid}=M_{base}V_{base}[/tex]
Thus, solving for the required volume of base, we obtain:
[tex]V_{base}=\frac{M_{acid}V_{acid}}{M_{base}}=\frac{0.1894M*10.00mL}{0.2006M}\\\\ V_{base}=9.442mL[/tex]
Best regards!
Salt water is classifies as a
Answer:
Salt water is classified as a mixture.
Explanation:
Brad pushed a shopping cart directly toward his car at a constant velocity for 6.0 seconds.
During that time, Brad's daughter jogged past him at 2.4 meters per second, and the cart
moved 6.6 meters. What was the cart's velocity?
Answer:
Watch Naruto that's the answer
Explanation:
Calculate the solubility of silver chloride in a solution that is 0.160 M in NH3. Express your answer using two significant figures. S
Balanced chemical equation :
[tex]2NH_3(aq)+AgCl(s) ->Ag(NH_3)_2^+(aq) + Cl^-(aq)[/tex], [tex]K_{sp}=2.9\times 10^{-3}[/tex]
So, solubility product will be equal to [tex]K_{sp}[/tex] :
[tex]K_{sp}=\dfrac{[Ag(NH_3)_2^+][Cl^-]}{[NH_3]^2}\\\\2.9\times 10^{-3}=\dfrac{S.S}{(1.6-2S)^2}[/tex]
Solving above we get :
S = 0.041
Therefore, solubility of silver chloride is 0.041 .
Hence, this is the required solution.
how many grams of potassium sulfite (K2SO3) are required to dissolve in 872 g of water to make a 0.128M solution
Answer:
17.7
hope this helps
have a good day :)
Explanation:
17.7 g of potassium sulfite ([tex]K_2SO_3[/tex]) are required to dissolve in 872 g of water to make a 0.128M solution.
What is molality?It is a measure of the concentration of a solute in a solution in terms of the amount of substance in a specified amount of mass of the solvent
You're looking for the mass of potassium sulfite, [tex]K_2SO_3[/tex], needed to make a 0.128 m, or 0.128 molal, solution.
Now, molality is used to express the concentration of a solution in terms of how many moles of solute it contains per kilogram of solvent.
This means that in order to find a solution's molality, you need to know
the number of moles of solute and the mass of the solvent expressed in kilograms.
In your case, you already know the mass of the solvent in grams, so the very first thing to do here is to convert it to kilograms.
872 g = 0. 872 Kg.
Now, a 0.128 m solution contains 0.128 moles of solute per kilogram of solvent. Since your sample contains 0.872 kg of solvent, it follows that it will contain 0.1116 moles [tex]K_2SO_3[/tex].
All you have to do now is use the molar mass of potassium sulfite to figure out how many grams would contain that many moles:
0.1116 moles x 158.26 g =17.7 g
Hence, 17.7 g of potassium sulfite ([tex]K_2SO_3[/tex]) are required to dissolve in 872 g of water to make a 0.128M solution.
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Is steel wool and vinegar an exothermic reaction? Explain.
Answer:
Vinegar contains acetic acid which removes this coating. When the protective coating is removed, oxygen in the atmosphere can reach the iron in the steel wool and a chemical reaction called oxidation occurs. ... This reaction is also an exothermic reaction. It creates heat energy
Explanation:
hope this helps u
Vinegar incorporates acetic acid which gets rid of this coating. When the defensive coating is removed, oxygen in the environment can reach the iron in the metal wool and a chemical reaction called oxidation occurs. This reaction is additionally an exothermic reaction. It creates warmth energy.
Hope it helped! Have a nice day! <3
4. a solution that is 0.025M in HCOOH and 0.025M in NaCOOH
Problem 7
I want to make a solution that will have [HCOO 1 3[HCOOH). I start with 100ml of a 0.1M HCOOH solution. How many ml of a 1M KOH solution
should I add?
KOH added : 7.5 ml
Further explanationBuffer solution of weak acid HCOOH and strong base KOH
Reaction
initial = 100 ml 0.1 M HCOOH = 10 ml mol HCOOH, and x mlmol of KOH
KOH + HCOOH ⇒ COOHK + H₂O
x 10
x x x x
- 10-x x x
[HCOO - ] = 3[HCOOH]
[tex]\tt \dfrac{x}{x+100~ml}=3\dfrac{10-x}{x+100}\\\\x=3(10-x)\\\\x=30-3x\\\\4x=30\rightarrow x=7.5~ml[/tex]
what is the difference between metals and non metals?
Answer:
Metals shows the property of malleability while non-metals are non-malleable. Metals are generally those substances that have a shiny surface and thus are lustrous. Whereas non-metals have non-shiny appearance and thus falls under the category of non-lustrous substances.
Explanation:
hope the answer was helpful
Calculate the new pressure of a gas if the gas at 50 ˚C and 81.0 kPa is heated to 100 ˚C at a constant volume.
Answer:
93.5 kPa
Explanation:
Step 1: Given data
Initial pressure (P₁): 81.0 kPaInitial temperature (T₁): 50 °CFinal pressure (P₂): ?Final volume (T₂): 100 °CStep 2: Convert the temperatures to the Kelvin scale
When working with gases, we need to consider the absolute temperature. We will convert from Celsius to Kelvin using the following expression.
K = °C + 273.15
T₁: K = 50°C + 273.15 = 323 K
T₂: K = 100°C + 275.15 = 373 K
Step 3: Calculate the final pressure of the gas
At a constant volume, we can calculate the final pressure of the gas using Gay-Lussac's law.
P₁/T₁ = P₂/T₂
P₂ = P₁ × T₂/T₁
P₂ = 81.0 kPa × 373 K/323 K
P₂ = 93.5 kPa
Does anybody know these questions ?
Answer:
proton 5
Explanation:
I think it is fluorine
A sled is at rest at the top of a slope 2 m high. The sled has a mass of 45 kg. What is the sleds potential energy
Answer:
[tex]\boxed {\boxed {\sf882 \ Joules}}[/tex]
Explanation:
Potential energy can be found by multiplying the mass by the height by the gravitational acceleration.
[tex]PE=mgh[/tex]
The mass is 45 kilograms. The height is 2 meters. The gravitational acceleration on Earth is 9.8 meters per seconds squared.
[tex]m=45 \ kg \\h= 2 \ m \\g=9.8 \ m/s^2[/tex]
Substitute the values into the formula.
[tex]PE=45 \ kg * 2 \ m * 9.8 m/s^2[/tex]
Multiply.
[tex]PE=441 kg*m/s^2*2 \ m[/tex]
[tex]PE= 882 \ kg *m/s^2 *m[/tex]
1 kg*m/s^² is equal to 1 Newton (N). Substitute N in for kg*m/s²
[tex]PE=882 \ N*m[/tex]
1 Newton meter (N*m) is equal to 1 Joule (J). Our current answer is equivalent to 882 Joules.
[tex]PE= 882 \ J[/tex]
The sled's potential energy is 882 Joules.
Answer:
882 J
Explanation:
How many mL (to the nearest mL) of 0.140-M KF solution should be added to 400. mL of 0.212-M HF to prepare a pH
Answer:
205mL of 0.140M KF solution
Explanation:
pH = 2.70 solution.
It is possible to obtain the pH of the buffer of HF-KF using the H-H equation:
pH = pKa + log [KF] / [HF]
Where pH is desire pH = 2.70
pKa is pKa of HF = 3.17
[KF] could be taken as moles of KF
And [HF] moles of HF: 400.0mL = 0.4L * (0.212mol/L) = 0.0848 moles of HF
Replacing:
2.70 = 3.17 + log [KF] / [0.0848 moles HF]
-0.47 = log [KF] / [0.0848 moles HF]
0.3388 = [KF] / [0.0848 moles HF]
[KF] = 0.02873 moles of KF must be added.
In mL using concentration of KF (0.140M):
0.02873 moles KF * (1L / 0.140 mol) = 0.205L =
205mL of 0.140M KF solutionWhen forming ions, nitrogen will gain or lose how many electrons, forming a cations or anions with a what charge?
Answer:
Nonmetals form negative ions (anions). A nitrogen atom must gain three electrons to have the same number of electrons as an atom of the following noble gas, neon. Thus, a nitrogen atom will form an anion with three more electrons than protons and a charge of 3−.
Explanation:
have advanced
Which method of heat transfer causes magma to circulate in the mantle?
Answer:
i hope this helps
Magma in the Earth's mantle moves in convection currents. The hot core heats the material above it, causing it to rise toward the crust, where it cools. The heat comes from the intense pressure on the rock, combined with the energy released from natural radioactive decay of elements.
Explanation:
