Answer:
16.2mL of 0.1111M NaOH are used
Explanation:
volumetric flask of 250.0mL
As first, the HCl reacts with CaCO3 as follows:
2HCl + CaCO3 → H2O + CaCl2 + CO2
Where 2 moles of HCl react with 1 mole of CaCO3
To solve this question we must find the moles of each reactant in order to determine the moles of HCl that remains:
Moles HCl:
0.01800L * (2.125mol / L) = 0.03825 moles HCl
Moles CaCO3 -Molar mass: 100.09g/mol-
0.4104g * (1mol / 100.09g) = 0.00410 moles CaCO3
Moles HCl that reacts:
0.00410 moles CaCO3 * (2 mol HCl / 1 mol CaCO3) =
0.00820 moles HCl
Moles HCl that remains:
0.03825 moles HCl - 0.00820 moles HCl:
0.03005 moles HCl remains
The HCl reacts with NaOH as follows:
HCl + NaOH → H2O + NaCl
That means, to reach the equivalence point, the moles of NaOH that must be added = Moles HCl, in a sample of 15.00mL, the moles of HCl are:
0.03005 moles HCl * (15.0mL / 250.0mL) = 0.001803 moles HCl = Moles NaOH. The volume of 0.1111M NaOH is:
0.001803 moles NaOH * (1L / 0.1111moles) = 0.016L 0.1111M NaOH are required, that is:
16.2mL of 0.1111M NaOH are used7 organic compounds of plant origin
Answer:
carbohydrates, lipids, proteins and nucleic acids1) ____C3H8 + ____O2 → ____CO2 + ____H2O
what charge does copper have?
Answer: 1+charge
Explanation: hoped this helped:)
How many lone pairs are on the central atom of a molecule of RnCl4?
A. 0
B. 2
C. 3
D. 1
How can you tell if an atom has a positive charge? What type of ion is this?
Answer:i love you
Explanation:
Answer: An atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom. If the atom has more electrons than protons, it is a negative ion, or ANION. If it has more protons than electrons, it is a positive ion.
Explanation:
2) Using the following equation:
Water is added to iron and over time iron (III) oxide along with hydrogen gas is produced.
a. How many grams of iron (III) oxide will be produced when 15.5g of iron reacts with excess water?
b. Calculate the percent yield if your team produced 14.5g of iron (III) oxide.
c. If the reaction takes place under STP then how many liters of hydrogen gas are produced?
the answer is 133
because thats how the water is
What is the difference between 13.254 m/s and 7.7 m/s? Round your answer to the correct number of significant digits.
Answer:
5.6 m/s
Explanation:
Given,
First number = 13.254 m/s
Second number = 7.7 m/s
We need to find the difference between these two numbers. First we round off 13.254 to one decimal place i.e. 13.254 = 13.3 m/s
The difference between them is given by :
D = 13.3 - 7.7
= 5.6 m/s
Hence, the difference of the two numbers is 5.6 m/s.
In order to determine the magnetic properties of phosphorus atom we need to find out the number of unpaired electrons present in the ground state of phosphorus atom! Select one of the answers below that represents this number.
Group of answer choices
1
4
3
0
2
Answer:
Think of it this way If you have a phosphorus atom whats its oposites once you found that out you may be able to find the answer
Explanation:
Hope this helps :)
4 methyl 2 pentanone structural formula
Answer:
(CH3)2CHCH2COCH3
Explanation:
An acetate buffer solution is prepared by combining 50. mL of 0.20 M acetic acid,
HC2H3O2(aq), and 50. mL of 0.20 M sodium acetate, NaC2H3O2(aq). A 5.0 mL sample of 0.10 M NaOH(aq) is added to the buffer solution.
Which of the following is a correct pairing of the acetate species present in greater concentration and of the pH of the solution after the NaOH(aq) is added? (The pKa of acetic acid is 4.7.)
Acetate Species -- pH
(A) HC2H3O2 -- < 4.7
(B) HC2H3O2 -- > 4.7
(C) C2H3O2 -- < 4.7
(D) C2H3O2 -- > 4.7
Answer:
The answer is "Option B".
Explanation:
[tex]\to CH_3COOH + NaOH \longleftrightarrow CH_3COONa + H_2O\\\\\to CH_3COONa + NaOH\longleftrightarrow CH3COONa\\\\\therefore \ mol\ NaOH = (5 \ E-3\ L)\times(0.10 \ \frac{mol}{L}) = 5 \ E-4\ mol\\\\[/tex]
[tex]\to mol\ CH_3COOH = (0.05 \ L)\times(0.20 \frac{mol}{L}) = 0.01 \ mol\\\\\to C \ CH_3COOH = \frac{(0.01 \ mol - 5 \ E-4\ mol) }{(0.105 \ L)}\\\\\to C \ CH_3COOH = 0.0905 \ M\\\\\therefore \ mol \ CH_3COONa = (0.05\ L )\times (0.20 \ \frac{mol}{L}) = 0.01 \ mol\\\\[/tex]
[tex]\to C \ CH_3COONa = \frac{(0.01\ mol + 5 \ E-4\ mol)}{(0.105\ L )}\\\\\to C \ CH_3COONa = 0.1 \ M\\\\\therefore Ka = ([H_3O^{+}]\times \frac{(0.1 + [H_3O^+]))}{(0.0905 - [H_3O^+])} = 1.75\ E-5\\\\\to 0.1[H_3O^+] + [H_3O^+]^2 = (1.75 E-5)\times (0.0905 - [H_3O^+])\\\\[/tex]
[tex]\to [H_3O^+]^2 \ 0.1[H_3O^+] = 1.584\ E-6 - 1.75\ E-5[H_3O^+]\\\\\to [H_3O^+]^2 + 0.1000175[H_3O^+] - 1.584 \ E-6 = 0\\\\\to [H_3O^+] = 1.5835\ E-5 \ M\\\\\therefore pH = - \log [H_3O^+]\\\\\to pH = - \log (1.5835 \ E-5)\\\\ \to pH = 4.8004 > 4.7[/tex]
If a gas is cooled from 343.0 K to 283.15 K and the volume is kept constant what final pressure would result if the original pressure was 760.0 mm HG?
Answer:
627.4 mmHg
Explanation:
From Gay-Lussac law:
[tex] \frac{p1}{t1} = \frac{p2}{t2} [/tex]
p1 = 760 mmHg
t1 = 343 K
t2=283.15 K
[tex]p2 = p1 \times \frac{t2}{t1} [/tex]
[tex]p2 = 760 \times \frac{283.15}{343.0} [/tex]
[tex]p2 = 627.4 \: mmhg[/tex]
If a gas is cooled from 343.0 K to 283.14 K and the volume is kept constant the final pressure would be 627.4 mm Hg if the original pressure was 760.0 mm Hg.
Gay-Lussac's LawGay-Lussac's law states that the pressure of a given mass of gas at a constant volume varies directly with the temperature of the gas. Gay-Lussac's law defined the relationship between pressure and temperature of a gas when kept at a constant volume.
According to the Gay-Lussac's LawP ∝ T (When V = constant)
or, P = kT
or, [tex]\frac{P_1}{T_1} = \frac{P_2}{T_2}[/tex]
Here,
[tex]P_{1}[/tex] = 760.0 mm Hg,
[tex]T_{1}[/tex]= 343.0 K
[tex]T_{2}[/tex] = 283.15 K
Now put the values in above formula, we get
[tex]\frac{P_1}{T_1} = \frac{P_2}{T_2}[/tex]
[tex]\frac{760.0\ \text{mm Hg}}{343.0K} = \frac{P_2}{283.15\ K}[/tex]
[tex]P_{2} = \frac{760.0\ \text{mm Hg} \times 283.15\ K}{343.0\ K}[/tex]
[tex]P_{2} = \frac{215194\ \text{mm Hg}}{343}[/tex]
[tex]P_{2}[/tex] = 627.4 mm Hg
Thus, we can say that if a gas is cooled from 343.0 K to 283.14 K and the volume is kept constant the final pressure would be 627.4 mm Hg if the original pressure was 760.0 mm Hg.
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A piece of copper has a density of 8.96 g/cm3, what is the volume of a 4.2 g piece?
Answer:
0.47 cm³
Explanation:
[tex]Volume=Mass/Density\\[/tex]
Plug in the mass (4.2 grams) and the density (8.96 g/cm³)
[tex]Volume=4.2/8.96\\Volume=0.47[/tex]
Therefore, the volume of a 4.2 g piece of copper is approximately 0.47 cm³.
I hope this helps!
what do you mean by antibodies
Consider a iron-silver voltaic cell that is constructed such that one half-cell consists of the iron, Fe, electrode immersed in a Fe(NO3)3 solution, and the other half-cell consists of the silver, Ag, electrode immersed in a AgNO3 solution. The two electrodes are connected by a copper wire. The Fe electrode acts as the anode, and the Ag electrode acts as the cathode. To maintain electric neutrality, you add a KNO3 salt bridge separating the two half-cells. Use this information to solve Parts B, C, and D. Part B The half-cell is a chamber in the voltaic cell where one half-cell is the site of the oxidation reaction and the other half-cell is the site of the reduction reaction. Type the half-cell reaction that takes place at the anode for the iron-silver voltaic cell. Indicate the physical states of atoms and ions using the abbreviation (s), (l), or (g) for solid, liquid, or gas, respectively. Use (aq) for an aqueous solution. Do not include phases for electrons. Express your answer as a chemical equation.
Answer:
See explanation
Explanation:
In the voltaic cell, energy is produced by spontaneous chemical reaction. One half cell functions as the anode (in this case it is the Fe/Fe^2+ half cell) while the other half cell functions as the cathode (in this case it is the the Ag/Ag^+ half cell).
At the anode;
Fe(s) -----> Fe^2+(aq) + 2e
At the anode;
2Ag^+(aq) + 2e ------> 2 Ag(s)
Overall cell equation;
Fe(s) + 2Ag^+(aq) ------> Fe^2+(aq) + 2 Ag(s)
What is the % Yield if 3.8 g of Cu was produced?
If 18.0 g of CO2 is produced in the reaction of C2H2 with O2 to form CO2 and
H2O, how many grams of H20 are produced in this reaction?
O 3.68 g
9.0 g
14.7 g
None of the above
7.37 g
Answer:
3.68 g
Explanation:
[tex]n_{CO2}[/tex] = 18 ÷ 44 = 0.4
2C2H2 + 5O2 → 4CO2 + 2H2O
2 : 5 : 4 : 2
0.409 (moles)
⇒ [tex]n_{H2O}[/tex] = 0.409 × 2 ÷ 4 = 0.2045 moles
⇒ [tex]m_{H2O}[/tex] = 0.2045 × 18 = 3.68 grams
Express the Following number in scientific notation with 3 significant figures:
450,000
[ ? ] x 10 to the power of ?
Answer:
4.50x10^5
Explanation:
dont forget the zero on the 4.50
a gas has a pressure of 0.470 atm at 60.0 C. What is the pressure at standard temperature?
Answer:
P2=0.385atm
Explanation:
step one:
Given that the temperature T1= 60 Celcius
we can convert this to kelvin by adding 273k to 60 Celcius
we have T1= 333k
pressure P1= 0.470 atm
step two:
we know that the standard temperature is T2= 273K
Applying the temperature and pressure relationship we have
P1/T1=P2/T2
substituting our given data we have
0.47/333=P2/273
cross multiply we have
P2= (0.47*273)/333
P2= 128.31/333
P2=0.385 atm
if u mix 10ml of 70%ethanol with 20ml of 80% ethanol with 50ml water what is the concentration of the resulted solution
Answer:
29% is the final concentration
Explanation:
To solve this question we must find the volume of ethanol added and the volume of the whole solution. The concentration will be:
Volume ethanol / Total volume * 100
Volume ethanol:
10mL * 70% = 7mL ethanol
+
20mL * 80% = 16mL ethanol
= 23mL ethanol
Total volume:
10mL + 20mL + 50mL = 80mL
Concentration:
23mL / 80mL * 100
= 29% is the final concentration
what are the isomers of hexane
Physical properties
Isomer M.P. (°C) B.P. (°C)
n-hexane −95.3 68.7
3-methylpentane −118.0 63.3
2-methylpentane (isohexane) −153.7 60.3
2,3-dimethylbutane −128.6 58.0
1 more row
What type of matter do alloys fall under?
a) Element
b) Compound
c) Heterogeneous mixture
d) Homogeneous mixture
Answer:
An alloy is a homogeneous mixture
Explanation:
D
An alloy, a metallic substance composed of two or more elements, as either a compound or a solution is a homogeneous mixture. The correct option is d.
What is an alloy?An alloy is a mixture of chemical elements of which at least one is a metal. Unlike chemical compounds with metallic bases, an alloy will retain all the properties of metal in the resulting material, such as electrical conductivity, ductility, opacity, and lustre, but may have properties that differ from those of pure metals, such as increased strength or hardness.
In some cases, an alloy may reduce the overall cost of the material while preserving important properties. In other cases, the mixture imparts synergistic properties to the constituent metal elements such as corrosion resistance or mechanical strength. Alloys are defined by a metallic bonding character. The alloy constituents are usually measured by mass percentage for practical applications, and in atomic fraction for basic science studies.
Alloys are usually classified as substitutional or interstitial alloys, depending on the atomic arrangement that forms the alloy.
Learn more about alloy, here:
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Draw the atomic structure with electronic configuration of Potassium
Answer:
Explanation:
i try to help you
✧Kindly see the attached picture! ☄
♪ Hope I helped! ♡
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☞ [tex] \underbrace{ \overbrace{ \mathfrak{Carry \: On \: Learning}}}[/tex] ✎
A cation with a +4 charge has 26 neutrons and 18 electrons. What is the identity of the element?
Answer: Titanium has 22 protons
Explanation: If an atoms donates 4 electrons, it forms cation with charge +4. So original atom have 22 electrons and because atom is neutral, it has 22 protons. Number of neutrons does not matter, there are more neutrons than protons in heavier atoms.
During the age of the dinosaurs, most mammals grew no bigger than a?
Answer:
T-rex
Explanation:
What is the pH of a solution that has a hydrogen ion concentration of 6.9*10^-4?
The pH would be 3.16 because the formula for finding the pH from a H± ion is pH = -log [H±]
So with that formula, you first have to substitute the H± with your numbers which in this case is 6.9 × 10^-4.
It should like this:
pH = -log (6.9 × 10^-4)
And lastly, just calculate.
pH = 3.16
Hope that helps, do let me know if you need more help in understanding this!
Calculate the pH and pOH of a solution of sodium hypoiodite NaOI, with a formal concentration of 0.05784 mol L-1. Note that the compound is soluble, dissolves into sodium and hypoiodite ions, and these react with water. The p K a of hypoiodous acid at 298 K is 10.64. Calculate the pH and the pOH of the resulting solution. Use all the approximations you can, be sure to verify them.
Answer:
pH = 11.70
pOH = 2.298
Explanation:
As we know
NaOI + H2O NaOH + HOI
pH = 7 + ½ (pKa + log (HOI))
Substituting the given values, we get –
pH = 7 + ½ (10.64 + log (0. 0.05784))
pH = 7 + ½ (10.64 -1.2377)
pH = 11.70
pOH = 14 – pH
pOH = 14 -11.70
pOH = 2.298
URGENT PLEASE HELP! Given 3.4 grams of x element with a molar mass of 24 g/mol and 4.2 grams of y element with a molar mass of 35 g/mol. How much of compound xy2 can be generated?
x + 2y -> xy2
4.4 g XY
I'm not sure but that's the closest I can get or try
Calculate the molar mass of PbSo3
Answer:
Lead sulfite is the inorganic compound with the formula PbSo3 or O3PbS.
Explanation:
How many moles in 2.5 x 10^24 atoms of calcium
There are 6.02*10 ^23 atoms in one mole of any substance according to avogadros law. Therefore in 2.41*10 ^25 calcium atoms, there are (2.41*10 ^25/6.02*10 ^23) moles of calcium, which is 40.03322259 or approximately 40 moles of calcium.
What will increased temperature in a reaction cause
1 Particles in a reaction to move more slowly
2 Particles in a reaction to move faster
3 Particles in a reaction to generate more electrical ions
4 Particles in a reaction to lose more electrical ions