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Related Questions
A 0.205 g sample of CaCO3 (Mr = 100.1 g/mol) is added to a flask along with 7.50 mL of 2.00 M HCl. CaCO3(aq) + 2HCl(aq) → CaCl2(aq) + H2O(l) + CO2(g)Enough water is then added to make a 125.0 mL solution.
Answers
The volume of the NaOH used is calculated as 14 mL.
What is stoichiometry?The term stoichiometry has to do with the calculation of the amount of substance in a reaction using mass - mole or mass - volume relationship.
Here;
Number of moles of CaCO3 = 0.205 g/100.1 = 0.00205 moles
Number of moles of HCl = 2.00 M * 7/1000 L = 0.014 moles
2 moles of HCl reacts with 1 mole of CaCO3
x moles of HCl reacts with 0.00205 moles of CaCO3
x = 0.00205 moles * 2/1 = 0.0041 moles
Hence HCl is the excess reactant
Amount of excess HCl = 0.014 moles - 0.0041 moles = 0.0099 moles
Concentration of excess HCl reacted = 0.0099 moles/125 * 10^-3 = 0.0792 M
Using;
CAVA/CBVB = NA/NB
CAVANB = CBVBNA
VB = CAVANB/CBNA
VB = 0.0792 M * 10 mL * 1/ 0.058 M
VB = 14 mL
Missing parts;
A 0.205 g sample of caco3 (mr = 100.1 g/mol) is added to a flask along with 7.50 ml of 2.00 m hcl. caco3(aq) + 2hcl(aq) → cacl2(aq) + h2o(l) + co2(g) enough water is then added to make a 125.0 ml solution. a 10.00 ml aliquot of this solution is taken and titrated with 0.058 m naoh. naoh(aq) + hcl(aq) → h2o(l) + nacl(aq) how many ml of naoh are used?
Learn more about stoichiometry: https://brainly.com/question/9743981
Which of the following mainly drives surface runoff?
A. magnetism
B. gravity
C. electricity
D. thermal energy
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If 1.76 g of an ideal gas occupy 1.0 L at standard temperature and pressure (STP), what is the molar mass of the gas?
Answers
Answer:
Explanation:
Whenever you see molar masses in gas law questions, more often than not density will be involved. This question is no different. To solve this, however, we will first need to play with the combined ideal gas equation PV=nRT to make it work for density and molar mass. The derivation is simple but for the sake of time and space, I will skip it. Hence, just take my word for it that you will end up with the equation:M=dRTPM = molar mass (g/mol)d = density (g/L)R = Ideal Gas Constant (≈0.0821atm⋅Lmol⋅K) T = Temperature (In Kelvin) P = Pressure (atm)As an aside, note that because calculations with this equation involve molar mass, this is the only variation of the ideal gas law in which the identity of the gas plays a role in your calculations. Just something to take note of. Back to the problem: Now, looking back at what we're given, we will need to make some unit conversions to ensure everything matches the dimensions required by the equation:T=35oC+273.15= 308.15 KV=300mL⋅1000mL1L= 0.300 LP=789mmHg⋅1atm760mmHg= 1.038 atmSo, we have almost everything we need to simply plug into the equation. The last thing we need is density. How do we find density? Notice we're given the mass of the sample (0.622 g). All we need to do is divide this by volume, and we have density:d=0.622g0.300L= 2.073 g/LNow, we can plug in everything. When you punch the numbers into your calculator, however, make sure you use the stored values you got from the actual conversions, and not the rounded ones. This will help you ensure accuracy.M=dRTP=(2.073)(0.0821)(308.15)1.038= 51 g/molRounded to 2 significant figuresNow if you were asked to identify which element this is based on your calculation, your best bet would probably be Vandium (molar mass 50.94 g/mol). Hope that helped :)
The ground electron configuration of a Tc atom is (Kr) 5s2 4d5. What is the electron configuration of a Tc3 ion
Answers
Answer:
2:1 of Tc in the periodic table
2. The gas from an erupting volcano had the following composition: 494 torr CO₂, 0.054 atm HCI, 0.028 atm HF, 0.017 atm 50₂. 0.76 mmHg H₂5, and H₂. If the total pressure is 1.00 atm, what is the partial pressure of H₂?
3. When a 10L balloon is heated from 22.0°C to 97.0°C, to what volume does it inflate?
4. Calculate the pressure of a gas in a 205 mL container at 0.0°C when the container was initially at a volume of 300.0 mL and a pressure of 1.05 atm
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Answer: The gas from an erupting volcano had the following composition: 494 torr CO₂, 0.054 atm HCI, 0.028 atm HF, 0.017 atm 50₂. 0.76 mmHg H₂5, and H₂. If the total pressure is 1.00 atm, what is the partial pressure of H₂?
Explanation:
Sodium hydroxide (0.400 mol) is allowed to react with an excess of sulfuric acid. How many moles of
sodium sulfate could be recovered from the products?
NaOH + H2SO4 → Na2SO4 + H20
Answers
Answer:
2 moles
Explanation:
In this reaction, the stoichiometry (mole ratio) is 1 mole of sulfuric acid reacting with 2 moles of sodium hydroxide (1:2 ratio)
When a sodium atom becomes an ion, the size of the atom
A
decreases by losing an electron,
B
decreases by gaining an electron,
с
increases by losing an electron,
D
increases by gaining an electron,
Answers
Sodium has an electron configuration of 2-8-1. Since sodium is a metal, it loses that one electron and becomes a positive ion. Since it is losing an electron, it is decreasing in size.
What is the chemical name
for ca2 and clo3-
Answers
Answer:
Calcium chlorate | Ca(ClO3)2 - PubChem.
Explanation:
how do the parts of the liverworts above the soil get the minerals from the soil that are needed for plant processes
Answers
Answer:
I don't know but I'm curious now
What is molarity of 47.0 g KCl dissolved in enough water to give 375 mL of solution?
Answers
This question provides us –
Weight of [tex] \bf KCl [/tex] is = 47 gVolume, V = 375 mL__________________________________________
Molar Mass of [tex]\bf KCl [/tex] –[tex]\qquad[/tex] [tex]\twoheadrightarrow\bf 39.0983 \times 35.453 [/tex]
[tex]\qquad[/tex] [tex]\twoheadrightarrow\bf 74.5513[/tex]
Using formula –
[tex]\qquad[/tex] [tex]\purple{\twoheadrightarrow\bf Molarity _{(Solution)} = \dfrac{ W\times 1000}{MV}}[/tex]
[tex]\qquad[/tex] [tex]\twoheadrightarrow\bf Molarity _{(Solution)} = \dfrac{ 47 \times 1000}{74.5513\times 375}[/tex]
[tex]\qquad[/tex] [tex]\twoheadrightarrow\bf Molarity _{(Solution)} = \dfrac{47000}{27956.7375}[/tex]
[tex]\qquad[/tex] [tex]\twoheadrightarrow\bf Molarity _{(Solution)} = \cancel{\dfrac{47000}{27956.7375}}[/tex]
[tex]\qquad[/tex] [tex] \twoheadrightarrow\bf Molarity _{(Solution)} = 1.68117M [/tex]
[tex]\qquad[/tex] [tex]\pink{\twoheadrightarrow\bf Molarity _{(Solution)} = 1.7M} [/tex]
Henceforth, Molarity of the solution is = 1.7M___________________________________________
What type of reaction is 2NaBr+Cl2-NaCl+Br2
Answers
Answer:
An anionic single replacement reaction.
Explanation:
Hope this helps!!!
Answer:
Substitution or Displacement maybe?
An atom with more electrons than protons has an overall positive charge and is called a
positive ion
Answers
That is correct! It is a positive ion!
Which color object would be the hottest? A violet object, a red object or a green object? Why?
Answers
Answer:
A Violet object
Explanation:
An Violet object attracts the heat after white objects, followed by orange, yellow, green, blue, indigo and violet, which attracts the most heat of any visible color other than black.
the ability of atoms to attract electrons from surrounding atoms is called
Answers
Answer:
Electronegativity
Explanation:
The ability of an atom to attract itself an electron pair shared with another atom in a chemical bond.
PLEASE HELP!!!!!!!
You compare the gas generated from a reaction using two antacid tablets with the gas generated from a reaction using four antacid tablets (consider the antacid as the limiting reagent).
At constant pressure and temperature, how do the volumes of the gases compare?
The two reactions produce the same amount of gas.
The gas generated by four antacid tablets has a smaller volume.
The gas generated by two antacid tablets has a smaller volume.
Answers
Answer: The gas generated by two antacid tablets has a smaller volume.
Explanation:
Since the antiacid is the limiting reagent, we know that the more tablets there are, the more gas there will be.
This means that there will be more gas generated by the four antiacid tablets when compared to the two antiacid tablets, which gives us that the gas generated by the two antiacid tablets has a smaller volume.
explain how sound is produced and travel from one place to another.
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Answer:
vibration of particles...........
Match each form of energy with its definition
Chemical energy
Kinetic energy
Potential energy
mechanical energy
energy of motion ----
the energy of the bonds between atoms-----
the sum of an object's kinetic and potential energies----
stored energy based on position or arrangement-------
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Answer:
energy of motion is kinetic
energy of Bond between atom chemical energy
stored energy based on position or arrangement-potential
the sum of an object's kinetic and potential energies----mechinical
Which of the following represents the velocity of a moving object?
Select one:
40 m north.
40.
40 m/s north.
40 m/s.
Answers
Answer:
The correct answer would be 40 m/s
Explanation:
The reason 40 m/s is the correct answer is because m/s stands for meters per second.
Hope this helps you with what you're working on! :D
Answer:
40 m/s north
Explanation:
Velocity is a vector quantity, so it have both direction and magnitude.
What metal speeds up rusting
Answers
Answer:
Vinegar
Explanation:
What liquid makes metal rust the fastest? Vinegar speeds up rusting because it contains a dilute form of acetic acid; positive hydrogen ions in the acid remove electrons from iron, ionizing it and making it susceptible to rust. How do you rust metal quickly?
Answer:
iron, especially if it is exposed to water and oxygen
1) Identify two different mineral nutrients present in the fertilizer
that helped the plant recover. Then, describe how each nutrient
benefits the plant.
Answers
The two different mineral elements that a fertilizer can contain are:
Phosphorus - build up of nucleic acid and ATPNitrogen- synthesis of proteinsWhat are fertilizers?Fertilizers are chemical substances added to the soil in order to improve crop growth and development.
Fertilizers are artificially made to contain mineral elements that are needed by the plants. Some of the mineral elements are as follows:
PhosphorusNitrogenPottasiumPhosphorus helps in the build up of nucleic acids and ATP for energy. Nitrogen is useful in the synthesis of proteins.Learn more about minerals at: https://brainly.com/question/18078524
Answer:
is the answer above right? im literally struggling rn
Explanation:
Determine the molar solubility of BaF2 in a solution containing 0.0550 M LIF. Ksp (BaF2) = 2.45 x 10^-5
Answers
Answer:
8.1*10^-3 or 0.00809917
Explanation:
Step 1: Identify the common ion
LiF and BaF2 both share the ion F^- therefore we can interchange the molarity of LiF for F.
Step 2: Set up a balanced equation
BaF2---Ba2+ + 2F
Step 3: Set up a solubility ice table
initial- Ba^2+: 0 2F: 0.0550
change- S 2F: S^2(exponent is result of coefficient)
Step 4: Set up Ksp equation
2.45*10^-5=[S][S]^2
Step 5: Plug in values
2.45*10^-5=[S][0.0550]^2
S=8.1*10^-3
73.5 mol of P4O10 contains how many moles of P ? moles of P:
Answers
Answer:
294 moles of P
Explanation:
For every 1 mol of P4O10 contains 4 mol of P
so;
73.5 mol P4O10 × 4 mol P
1 mol P4O10
= 73.5 × 4
= 294 moles of P
73.5 mol of [tex]P_4O_{10}[/tex] contains 294 moles of P. In 1 mole of [tex]P_4O_{10}[/tex], there are 4 moles of P.
The International System of Units (SI) uses the mole (abbreviated as mol) as its basic unit to measure the amount of a substance. It is mostly used in chemistry and is defined as the volume of a substance that contains exactly 12 grammes of pure carbon-12 in terms of atoms (or equivalent amounts of molecules, ions, or particles). The fundamental notion that atoms combine in whole-number ratios to form compounds serves as the foundation for the concept of the mole. It makes it simple for scientists to convert between a substance's mass and the quantity of atoms or molecules it contains.
In 1 mole of [tex]P_4O_{10}[/tex], there are 4 moles of P.
=4 × 73.5 moles of P.
= 294 moles of P
To know more about moles, here:
https://brainly.com/question/15209553
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A 25 L tank of oxygen under a pressure of.80 atm would require what pressure to
decrease the volume to 1.0 L?
Answers
Answer:
20 atm
Explanation:
Use the equation P1 x V1 = P2 x V2.
1) Rearrange the equation with algebra to solve for P2.
P2 = (P1 x V1)/ V2
2) Plug in to the equation where V1 = 25L, P1 = 0.80 atm, and, V2 = 1 L
P2 = (25L x 0.80 atm)/ 1L
3) Solve: P2 = 20 atm
The pressure required to reduce the oxygen's volume to 1 L would be 20 atm.
A buffer was prepared containing 0.50 M formic acid (HCOOH) and 0.50 M sodium formate (NaCOOH). The Ka of formic acid is 1.7 x 10-4. What will be the pH after 0.010 mol of NaOH(s) is added to 100.0 mL of the buffer
Answers
For a buffer that was prepared contain 0.50 M formic acid (HCOOH) and 0.50 M sodium formate (NaCOOH). the pH is mathematically given as
pH=3.95
What is the pH after 0.010 mol of NaOH(s) is added to 100.0 mL of the buffer?Generally, the equation for the Hendersons equation is mathematically given as
pH=pKa+log(SALT)/(ACID)
Where
moles of (NaCOOH)=100*0.05/1000
moles of (NaCOOH)=0.05moles
and formic acid
moles of formic acid=100*0.05/1000
moles of formic acid=0.05moles
Therefore
pKa=-logka
pKa=1.4*10*3.77
pH=3.77+log{0.06/0.04}
pH=3.95
In conclusion, the pH is
pH=3.95
Read more about pH
https://brainly.com/question/1503669
0.75 mol hydrogen sulfide (H2S)
Answers
Answer:
• Information and media literacy
Directions
Read the instructions for this self-checked activity. Type in your response to each question, and check your answers. At the end of the activity, write
brief evaluation of your work.
Activity
Part A
Now that you have analyzed the resources provided in the lesson, write your own response to the question, What is the main reason the US Civil
War started? Base your
Explanation:
• Information and media literacy
Directions
Read the instructions for this self-checked activity. Type in your response to each question, and check your answers. At the end of the activity, write
brief evaluation of your work.
Activity
Part A
Now that you have analyzed the resources provided in the lesson, write your own response to the question, What is the main reason the US Civil
War started? Base your
Answer: =378.94000053g
Explanation:
I think that explains it
how can the ph of antiacid table de determine in laboratory
Answers
Answer:
Antacids are bases that react stoichiometrically with acid. The number of moles of acid that can be neutralized by a single tablet of a commercial antacid will be determined by back titration.
Correct me if i'm wrong, Hope This helps
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#Carryonlearning
What is added to balance hydrogen and oxygen atoms in an oxidation-
reduction reaction in basic solution?
A. OH and H2O
B. Ht and H20
C. H2 and 02
D. OH and Ht
Answers
Answer:
OH^- and H_2O
Explanation:
Remember these things about basic and acidic medium
In acidic medium we add H+ to balance Hydrogen and H_2O for OxygenIn basic we add OH- which turns H+ to waterSet up a cell that has a Mg electrode in a 1.0 M aqueous Mg2+ solution on the left side and a Cu electrode in a 1.0 M aqueous Cu2+ solution on the right side. Add the salt bridge. What is the balanced net ionic equation for this reaction? Include physical states.
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The cell notation is; Cu^2+(aq)/Cu(s)//Mg(s)/Mg^2+(aq). The standard cell notation helps us to write the cell equation easily.
What is electrochemical cell?The electrochemical cell involves the transformation of chemical energy to electrical energy in an electrochemical cell. The two electrodes involved are the cathode and the anode.
In this case, the Mg is the anode and the Cu is the cathode hence the cell notation is; Cu^2+(aq)/Cu(s)//Mg(s)/Mg^2+(aq).
Learn more about electrochemical cell: https://brainly.com/question/12034258
Which would lower the reaction rate?
A. Increasing the concentration of reactants.
B. Increasing the temperature of the system.
C. Raising the value of k.
D. Decreasing the temperature of the system.
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Answer:
D. Decreasing the temperature of the system
Explanation:
Identify the independent /manipulated variable
Answers
Answer:
independent- test variable
manipulated - outcome variable; if needed, there could be changes.
Explanation:
knowledge