Answer:
B
Explanation:
Please help and explain how to do it need the answer asap, please.
Answer:
45 and 20 c2 Or4
Explanation:
2.50 g of CO2 gas is confined in a rigid cylinder at a pressure of 4.65 atm. If 0.42 g of gas is released from the cylinder, what is the new pressure?
Answer:
5.59atm
Explanation:
boyles law
P1V1=P2V2
4.65×2.5=P2×(2.5-0.42)
11.625=P2×2.08
P2=5.59atm
If 50mL of 0.15M calcium sulfide is added to 30mL of 0.35M ammonium carbonate, how many grams of precipitate will form
Answer:
0.750 g
Explanation:
The reaction that takes place is:
CaS (aq) + (NH₄)₂CO₃ (aq) → CaCO₃ (s) + (NH₄)₂S (aq)First we calculate how many moles of each reactant were added, using the given volumes and concentrations:
CaS ⇒ 50 mL * 0.15 M = 7.5 mmol CaS(NH₄)₂CO₃ ⇒ 30 mL * 0.35 M = 10.5 mmol (NH₄)₂CO₃Given that they react in a 1:1 ratio, and that there are less CaS moles than (NH₄)₂CO₃ moles, CaS is the limiting reactant.
7.5 mmoles of CaS will produce 7.5 mmoles of CaCO₃.We now convert 7.5 mmol CaCO₃ into mg, using its molar mass:
7.5 mmol * 100 mg/mmol = 750 mgFinally we convert 750 mg to g:
750 mg / 1000 = 0.750 gWill Mark Brainliest.
1. Analysis of a hydrate of iron(III) chloride revealed that in a 10.00g sample of hydrate, 6.00 g is anhydrous iron(III) chloride and 4.00 g is water. Determine the formula and the name of the hydrate.
Answer:
FeCl₃ . 6H₂O, BRAINLIST PLZ
Explanation:
1) The chemical formula of iron(III) chloride is FeCl₃ (the oxidation number of Fe is 3+, and the oxidation number of Cl is 1-).
2) The formula that you are lookin for the hydrate is of the type FeCl₃ . n H₂O, where n is the number of water molecules per each unit formula of Fe₂O₃.
3) Find the mass of anhydrous FeCl₃ by difference:
mass of FeCl₃ = mass of the sample - mass of the water in the sample
mass of FeCl₃ = 5.49g - 2.20 g = 3.29 g
4) Convert the mass of FeCl₃ in number of moles
number of moles = mass in grams / molar mass
molar mass of FeCl₃ = 55.845 g/mol + 3×35.453 g/mol = 162.204 g/mol
number of moles = 3.29 g / 162.204 g/mol = 0.0203 mol FeCl₃
5) Convert the mass of water in number of moles:
molar mass of water = 18.015 g/mol
number of moles of water = mass in grams / molar mass = 2.20 g / 18.015 g/mol = 0.122 moles H₂O
6) Find the mole ratio of water to iron chloride:
0.122 mol water / 0.0203 mol iron chloride = 6.01 ≈ 6
Therefore, the complete formula of the hydrate is FeCl₃ . 6H₂O,
The chemical structures of eugenol and iso eugenol differ in what way?
a)Alkene location on aliphatic chain
b)Alkene geometry on aliphatic chain
c)Substitutions on the aromatic ring
d)These compounds are diastereomers of one another.
A radioactive nuclide is used to detect eye tumors. An atom of this radionuclide contains 15 protons, 15 electrons, and
17 neutrons. Which is symbol of this radionuclide?
Answer: ³²P
Explanation:
The radionuclide in question is known as Phosphorus-32. It is an isotope of Phosphorus that is radioactive and has one more neutron than the normal phosphorus does.
Phosphorus does not exist in nature and is created artificially by bombarding the normal stable phosphorus with neutrons. Due to its radioactive nature, it has proven to be useful in the medical industry where it has been used to detect eye tumors as well as in treating some diseases.
why does a plant have a cell wall and a cell membrane?
ASAP Pls have to turn it in at 11:00pm
Answer:
The cell wall surrounds the plasma membrane and provides the cell tensile strength and protection. ... The cell wall surrounds the plasma membrane of plant cells and provides tensile strength and protection against mechanical and osmotic stress.
hope It Helps U
Please Mark me As brainlist
The diameter of a circle is 17 cm. Find its circumference in terms of \piπ.
Answer: sorry I didnt know the answer it wont let me get off
Explanation:
Climate change as we know it today is
characterized by a(n) __change in the
earth's temperature.
slow
abrupt (sudden)
rough
CH3 – CH2 – CH2 – CH2 – OH
Answer:
IUPAC name is butanol
I hope it's helps you
Calculate the volume, in liters, occupied by 0.775 mol of oxygen gas at STP.
Answer:
17.4 L
Explanation:
Step 1: Given data
Moles of oxygen (n): 0.775 molPressure of the gas (P): 1 atm (standard pressure)Temperature of the gas (T): 273.15 K (standard temperature)Step 2: Calculate the volume occupied by 0.775 moles of oxygen at standard temperature and pressure (STP)
At STP, 1 mole of an ideal gas occupies 22.4 L.
0.775 mol × 22.4 L/1 mol = 17.4 L
Rachard is studying a sample of a substance. The sample is in a large, triangle-shaped flask. Rachard moves the sample to a small, rectangular container. Both containers are closed. Below is an image of the containers used by Rachard. She notices that the shape and the volume of the substance both change when the sample is moved. In which state of matter is the substance?
it refers to the length of the entire path the object travelled
Answer:
Path length is the overall distance traveled following the path of where the object travel. ... Displacement is the distance from the starting point of the object to its final point irregardless where it travels.
an erlenmeyer flask contains 15.00mL of 0.030 M HCI before titration. 5.00 mL of 0.050 of M NaOH is added to the HCI in the flask during titration. What is the mole ratio of acid (HCI) to base (NaOH) in the balanced neutralization equation?
0.05 to 0.03
1:1
1:2
which expression. gives the actual moles of base added?
0.050x5.00
0.030x0.015
0.050x0.005
How many moles of H+ will be present following neautralization?
0.25
0.00025
0.025
Answer:
1.1
0.050*0.005
0.00025
Explanation:
PPLLLLLZZZZZ HELPPPPPPPPP ME WITH THIS QUESTION BRAINLIEST ANY ANSWERS WOULD BE GREATLY APPRECIATED :) chemical reaction will stop when the limiting reactant is used up.Question 1 options:
True
False
I believe that this statement is true
How is the molar mass of a molecule determined? What are its units?
Answer:
Explanation:
molar mass=valency of the element*atomic number
its unit is amu
What’s a chemical property
Answer:
A chemical property is any of a material's properties that becomes evident during, or after, a chemical reaction; that is, any quality that can be established only by changing a substance's chemical identity. ... They can also be useful to identify an unknown substance or to separate or purify it from other substances.
Hello I need help please
Answer:
The concentration of an acid in a solution can be determined by making an acid-base titration. To do this, a known volume of the acid solution is gradually added alkali solution whose concentration is known, until a neutral pH is reached.
Explanation:
A mixture of 14.0 grams of H2, 84.0 grams of N2, and 64.0 grams of O2 are placed in a flask. The partial pressure of the O2 is 78.00 torr. What is the total pressure in the flask
Answer:
[tex]P_{tot}=465.27torr[/tex]
Explanation:
Hello there!
In this case, according to the given information, it will be possible for us to use the Dalton's law, in order to solve this problem. However, we first need to calculate the mole fraction of oxygen by firstly calculating the moles of each gas:
[tex]n_{H_2}=\frac{14.0g}{2.02g/mol} =6.93mol\\\\n_{N_2}=\frac{84.0g}{28.02g/mol}=3.00mol\\\\n_{O_2}=\frac{64.0}{16.00g/mol} =2.00mol[/tex]
Next, we calculate such mole fraction as follows:
[tex]x_{O_2}=\frac{2}{6.93+3+2} =0.168[/tex]
Then, given the following equation:
[tex]P_{O_2}=P_{tot}*x_{O_2}[/tex]
So we solve for the total pressure as follows:
[tex]P_{tot}=\frac{P_{O_2}}{x_{O_2}} \\\\P_{tot}=\frac{78.00torr}{0.168} \\\\P_{tot}=465.27torr[/tex]
Regards!
When CO2(g) is put in a sealed container at 730 K and a pressure of 10.0 atm and is heated to 1420 K , the pressure rises to 24.1 atm . Some of the CO2 decomposes to CO and O2.
Calculate the mole percent of CO2 that decomposes.
Express your answer using two significant figures.
Answer:
48%
Explanation:
Based on Gay-Lussac's law, the pressure is directly proportional to the temperature. To solve this question we must assume the temperature increases and all CO2 remains without reaction. The equation is:
P1T2 = P2T1
Where Pis pressure and T absolute temperature of 1, initial state and 2, final state of the gas:
P1 = 10.0atm
T2 = 1420K
P2 = ?
T1 = 730K
P2 = 10.0atm*1420K / 730K
P2 = 19.45 atm
The CO2 reacts as follows:
2CO2 → 2CO+ O2
Where 2 moles of gas react producing 3 moles of gas
Assuming the 100% of CO2 react, the pressure will be:
19.45atm * (3mol / 2mol) = 29.175atm
As the pressure rises just to 24.1atm the moles that react are:
24.1atm * (2mol / 19.45atm) = 2.48 moles of gas are present
The increase in moles is of 0.48 moles, a 100% express an increase of 1mol. The mole percent that descomposes is:
0.48mol / 1mol * 100 = 48%
ou discover that the complex decomposes in water. When 0.1000 g of the complex is dissolved in water with excess NaHg(SCN)4, all of the Co(II) is precipitated as CoHg(SCN)4 (s). After the precipitate is washed and dried, its mass is found to be 0.1102 g. How many grams of cobalt are contained in the original 0.1000 grams of the complex
Answer:
6.28x10⁻³ g
Explanation:
First we convert 0.1102 grams of CoHg(SCN)₄ into moles, using its molar mass:
0.1102 g ÷ 491.9 g/mol = 2.24x10⁻⁴ mol CoHg(SCN)₄There is 1 Co mol per CoHg(SCN)₄ mol, meaning there's also 2.24x10⁻⁴ moles of Co.
We now convert 2.24x10⁻⁴ moles of Co into grams, using its molar mass:
2.24x10⁻⁴ mol Co * 28.01 g/mol = 6.28x10⁻³ giaeurphgqihrgiqerhg;iadg;iwepi
Answer:
hkdhmfewavs,nxzjrgjngrnjm
Explanation:
Answer:h hed chd dechgde chsxqwertyuioplkjhgfdsaazxcvbnm
Explanation:
The density of a 25.0% HCl solution (by mass) is 1.05 g/mL, what is the molality of the solution?
(MW HCI: 36.46g/mol, H2O: 18.015g/mol)
a. 9.60 m
b. 6.86 m
c. 7.20 m
d. 9.14 m
e. None of the above
Answer:
[HCl] = 14.7M in HCl
Explanation:
Definition of Molarity (M) = moles solute / Liters of Solution
Given 25.0% HCl (aq) => 25g HCl/100g Solution => ? moles HCl/Liter Solution
Convert 25g HCl to moles = moles solute
moles HCl => moles HCl = 25g HCl / 18.015g HCl/mole HCl = 1.387732 mole HCl = 1.4 moles HCl (2sig.figs.)
Determine Liters of Solution as follows:
Given 25% HCl Solution => 25g HCl/100 g Solution
100 g Solution = (100 g solution) / (1.05 g Solution/ml Solution )
= 95.2381 ml Solution x 1 Liter Solution/1000 ml Solution
= 0.0952 Liters Solution
Apply above mole and volume data to definition of mole.
∴Molarity = moles solute / Liters solution
= 1.4 moles solute (HCl)/0.0952 L solution
= 14.7 Molar in HCl(aq)
What is the pH when the hydrogen ion concentration is 1 x 10-3 M?
O a. 3.3
O b. 4
O c. 2.7
O d. 2
O e. 3
Answer:
e. 3
Explanation:
In order to solve this problem we need to keep in mind the definition of pH:
pH = -log[H⁺]As stated by the problem, the hydrogen ion concentration, [H⁺], is 1x10⁻³ M.
As all required information is available, we now can calculate the pH:
pH = -log(1x10⁻³ M)pH = 3The correct option is thus e.
An empirical formula calculation gives a molar ratio of 1.0 oxygen, 4.8 hydrogen, 4.1 carbon and 1.8 nitrogen. If the molecular mass is approximately 200 amu, what is the molecular formula
Answer:
[tex]C_8H_{10}O_2N_4[/tex]
Explanation:
Hello there!
In this case, according to the given information about the empirical formula of this compound, we can infer that these mole ratios can be rounded to the following whole numbers in order to find the empirical formula:
[tex]C_4H_5ON_2[/tex]
Whose molar mass is 97.09 amu and thus, the ratio of the molecular to the empirical molar mass is:
[tex]200/97.09=2.1[/tex]
Which is almost a factor of 2; and therefore, the resulting molecular formula is:
[tex]C_8H_{10}O_2N_4[/tex]
Regards!
Determine the packing efficiency of a simple cubic unit cell that contains one atom with a metallic radius of 175 pm.
Answer:
the packing efficiency is 52.36%
Explanation:
Given the data in the question;
simple cubic unit cell that contains one atom with a metallic radius of 175 pm;
we know that;
Edge length of Simple cubic (a) is related to radius of atom (r) as follows;
a = 2r
since radius r = 175 pm
we substitute
a = 2 × 175 pm
a = 350 pm
Now we get the volume unit;
Volume of unit cell = a³ = ( 350 pm ) = 42875000 pm³
Next we get Volume of sphere;
Volume of Sphere = [tex]\frac{4}{3}[/tex]πr³
Volume occupied by 1 atom = [tex]\frac{4}{3}[/tex] × π × ( 175 pm )³
= [tex]\frac{4}{3}[/tex] × π × 5359375 pm³
= 22449297.5 pm³
Now, the packing efficiency = ( Volume occupied by 1 atom / Volume of unit cell ) × 100
we substitute;
packing efficiency = ( 22449297.5 pm³ / 42875000 pm³ ) × 100
= 0.523598 × 100
= 52.36%
Therefore, the packing efficiency is 52.36%
Fill the missing blank
i’m generally confused about this so if anyone could help me it would mean a lot!!!!
Answer:
The answers to your questions are given below.
Explanation:
1. The symbol of Zinc is Zn
2. Determination of the proton number
Atomic number is simply defined as the number of protons in the nucleus of an atom. Mathematically, it is expressed:
Atomic number = proton number
Atomic number = 30
Therefore,
Proton number = 30
3. Determination of the neutron number
Mass Number = 65
Proton number = 30
Neutron number =?
Mass number = Proton + Neutron
65 = 30 + Neutron
Collect like terms
65 – 30 = Neutron
35 = Neutron
Thus,
Neutron number = 35
4. Determination of the electron number
Since the element is in it's ground state (i.e it has no charge), thus, the number of protons of the element is the same as number of electrons i.e
Electron number = proton number
Proton number = 30
Thus,
Electron number = 30
If 45.6 g of Fe2O3 reacts with excess water, how much heat is required?
Explanation:
I
have not yet learnt chemistry so sorry
Answer:
350
Explanation:
Help.
Work needs to be shown
show equations and how you did it
Answer:
436.8 mmHg.
Explanation:
From the question given above, the following data were obtained:
Total pressure (Pₜ) = 0.93 atm
Pressure of N₂ (Pₙ₂) = 270 mmHg
Pressure of O₂ (Pₒ₂) =?
Next, we shall convert the total pressure to mmHg . This can be obtained as follow:
1 atm = 760 mmHg
Therefore,
0.93 atm = 0.93 × 760 mmHg / 1 atm
0.93 atm = 706.8 mmHg
Finally, we shall determine the pressure of the O₂. This can be obtained as follow:
Total pressure (Pₜ) = 706.8 mmHg
Pressure of N₂ (Pₙ₂) = 270 mmHg
Pressure of O₂ (Pₒ₂) =?
Pₜ = Pₙ₂ + Pₒ₂
706.8 = 270 + Pₒ₂
Collect like terms
706.8 – 270 = Pₒ₂
436.8 = Pₒ₂
Pₒ₂ = 436.8 mmHg
Thus, the pressure of O₂ is 436.8 mmHg
Chemical Reactions:Question 3
The graph shows the energy change that occurs during a chemical reaction.
Graph 1
Energy
Reaction Progress
What conclusion can be reached based upon the graph?
Select one
The energy of the reactants is less than the energy of the products,
The energy of the products and the energy of the reactants are equal.
The energy of the products is less than the energy of the reactants
Energy was neither absorbed not released during this reaction
Answer:
because of how big it is
Explanation:
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The graphs shows the energy change of an exothermic reaction. Hence, the energy of products is less than the energy of reactants. Thus, option c is correct.
What is an exothermic reaction?The reaction in which heat energy is evolved to the surroundings is called an exothermic reaction. The reaction where, the heat energy is absorbed by the system is called endothermic reaction.
An energy diagram is used to describe the energy change in a reaction and the energy difference between reactants and products. In an endothermic reaction, the reactants are absorbing sufficient energy and thus easily overcome the barrier potential.
In exothermic reactions, products are absorbing energy and overcome the barrier potential. Therefore, in exothermic reactions, the potential energy of products is less than that of reactants as shown in the diagram.
Find more on energy diagram:
https://brainly.com/question/30260225
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