Answer:
Empirical formula: CH₃O
Molecular formula: C₂H₆O₂
Explanation:
All carbon is converted in CO2 and all hydrogen in H2O. Thus, we can find mass of each element and, by subtracting, the mass of Oxygen:
Mass C:
10.52g CO2 * (1mol / 44g) = 0.239 moles CO2 = Moles C * (12.01g / mol) =
2.87g C
Mass H:
6.460g H2O * (1mol / 18g) = 0.359 moles H2O * 2 = 0.718 moles H * (1g / mol) =
0.718g H
Mass O:
7.417g Sample - 2.87g C - 0.718g H =
3.829g O
Now, we can determine empirical formula defined as the simples whole number ratio of atoms present in a compound with moles of each atom:
Moles C: 0.239 moles C
Moles H: 0.718 moles H
Moles O: 3.829g * (1mol / 16g) = 0.239 moles O
The ratio of moles of each atom divided in moles of oxygen:
C: 0.239 mol / 0.239 mol = 1
H: 0.718 mol / 0.239 mol = 3
C: 0.239 mol / 0.239 mol = 1
Empirical formula: CH₃OThe molar mass of CH3O is:
12.01g/mol + 1g/mol*3 + 16g/mol =
31.01g/mol
That means molecular formula is twice empirical formula because its molecular mass is 31.01g/mol * 2 = 62.02g/mol ≈ 62.07g/mol
Molecular formula: C₂H₆O₂Where is the oldest rock layer in the dome?
Answer:
the oldest rocks are in the center of the dome structure.
Explanation:
Answer:
Center
Explanation:
If you have 0.341 m3 of water at 25.0 ∘C in an insulated container and add 0.127 m3 of water at 95.0 ∘C, what is the final temperature f of the mixture? Use 1000 kg/m3 as the density of water at any temperature.
Answer:
[tex]T_F=44.0\°C[/tex]
Explanation:
Hello!
In this case, since this calorimetry problem is about the mixing of two volumes of water, we can infer that the heat lost by the hot water is gained by the cold water so we can write:
[tex]Q_{W,hot}=-Q_{W,cold}[/tex]
Which in terms of mass, specific heat and temperature change is:
[tex]m_{W,hot}C_{W,hot}(T_F-T_{W,hot})=-m_{W,cold}C_{W,cold}(T_F-T_{W,cold})[/tex]
Clearly, the specific heat is the same for both waters and the masses, considering the given densities are:
[tex]m_{W,cold}=0.341m^3*\frac{1000kg}{1m^3} =341kg\\\\m_{W,hot}=0.127m^3*\frac{1000kg}{1m^3} =127kg\\[/tex]
Thus, we can solve for the the final temperature as shown below:
[tex]T_F=\frac{m_{W,hot}T_{W,hot}+m_{W,cold}T_{W,cold}}{m_{W,hot}+m_{W,cold}}[/tex]
And by plugging in the values we obtain:
[tex]T_F=\frac{341kg*25.0\°C+127kg*95.0\°C}{341kg+127kg}\\\\T_F=44.0\°C[/tex]
Best regards!
The final temperature of the mixture of hot and cold water at the given masses is 44 ⁰C.
The given parameters;
volume of the cold water, V = 0.341 m³ initial temperature of the wave, = 25⁰Cvolume of water added hot water, = 0.127 m³final temperature of water, = 95⁰ CThe mass of the cold water and the hot water are calculated as follows;
[tex]mass = density \times volume\\\\m_{cold} = 1000 \times 0.341 = 341 \ kg\\\\m_{hot} = 1000 \times 0.127 = 127 \ kg[/tex]
Apply the principle of conservation of energy to determine the final temperature of the mixture;
heat lost by the hot water = heat absorbed by the cold water
[tex]341 \times 4200 \times (t - 25) = 127 \times 4200 \times (95 - t)[/tex]
where;
t is the final temperature of the mixture[tex]341(t- 25) = 127(95-t)\\\\341t - 8525 =12065 - 127t\\\\468t = 20590\\\\t = \frac{20590}{468} \\\\t = 44 \ ^0C[/tex]
Thus, the final temperature of the mixture of hot and cold water at the given masses is 44 ⁰C.
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Which of the following describes a study that is “longitudinal”? A study that follows people for an extended period of time to see if they develop a disease or condition. A study that looks at people in one location, to reduce any bias introduced by varying locations. A study that follows people taking a drug or placebo for 6 weeks to see if they develop a disease or condition. A study that follows people taking medication in different locations, to see if their location impacts the medication’s effectiveness.
Answer:
I'd say it's the first option, A study that follows people for an extended period of time to see if they develop a disease or condition.
Explanation:
What statement best describes what a circle graph shows?
A. The average of a data set
B. A frequency distribution
ООО
C. The relationship between two variables
D. Data as proportions of a whole
A
map shows the physical properties or characteristics of a region.
highway
topographical
population
computer
compound
Answer:
Topographical is the correct ans
Please Please! help help! so stress
A sample of gas contains 0.1200 mol of NH3(g) and 0.1500 mol of O2(g) and occupies a volume of 13.0 L. The following reaction takes place: 4NH3(g) + 5O2(g)4NO(g) + 6H2O(g) Calculate the volume of the sample after the reaction takes place, assuming that the temperature and the pressure remain constant.
Answer:
14.44 Liters
Explanation:
4NH3(g) + 5O2(g) -----> 4NO(g) + 6H2O(g)
From the equation of the reaction, the mole ratio of NH3 to NO2 = 1:1
Therefore 0.12 moles of NH# produces 0.12 moles of NO
Also from the equation of reaction, mole ratio of NH3 to H20 is 4:6
Therefore, 0.12 moles of NH3 will produce 0.12 * 6/ 4 moles of H2O =0 0.18 moles of H2O
Total moles of gases produced = 0.30 mole
From Avogadro's law:
v1/n1 = v2/n2
v1 = 13.0 L
n1 = 0.12 + 0.15= 0.27 moles
v2 = ? =
n2 = 0.30
V2 = v1n2/n1
v2 = 13.0 * 0.30/0.27
V2 = 14.44 Liters
The beginning of this chemical equation represents the
starting materials for a chemical reaction,
H2O + S03 - ?
Which compound is likely produced by the chemical reaction?
A. HF
B. H2CO3
C. H2SO4
D. CO2
SUBMIT
Answer:
C. H₂SO₄
Explanation:
Given expression:
H₂O + SO₃ → H₂SO₄
In the chemical reaction, the product and the reactant have the same species.
Chemical reactions obeys the law of conservation of matter.
This way, atoms combine with one another to give a desired product. The products will contain a mix of the reactants.
Fluorine is not part of the reactantsCarbon is not part of the reactantsCarbon is not part of the reactants.Answer:
cccccccccc
Explanation:
Which of the following is a pure substance?
Answer:
Examples of pure substances include tin, sulfur, diamond, water, pure sugar (sucrose), table salt (sodium chloride) and baking soda (sodium bicarbonate). Crystals, in general, are pure substances. Tin, sulfur, and diamond are examples of pure substances that are chemical elements. All elements are pure substances
Explanation:
Questlon 3 of 5 Which kind of energy does an object have because of its height above Earth's surface? O A. Electrical O B. Chemical O C. Elastic D. Gravitational
Answer:Electrical
Explanation:because its above the earth's surface
Answer:
Chemical O
Explanation:
What type of cells are gametes?
Answer:
Reproductive cells(also known as sex cells) are gametes.
Explanation:
Have a great day :)
Answer:
Gametes are an organism's reproductive cells
Explanation:
What’s the full electronic configuration for lead
Answer:
1s2, 2s2, 2p6, 3s2, 3p6, 3d10, 4p6, 5s2, 4d10, 5p6, 6s2, 4f14, 5d10, 6p2.
Explanation:
mark as brainliest
9.78 cm equals how many
mm
Answer:
97.8
Explanation:
Calculate the mass of 5.3 moles of chloric acid (hcl03)
The molar mass of an imaginary molecule is is 93.89 g/mol. Determine its density at STP.
Answer:
Density = 4.191 gm/L
Explanation:
Given:
Molar mass = 93.89 g/mol
Volume(Missing) = 22.4 L (Approx)
Find:
Density at STP
Computation:
Density = Mass/Volume
Density = 93.89 / 22.4
Density = 4.191 gm/L
A child and his mother both have blue eyes. They both have blue eyes because inherited traits of an organism are governed by the -
A. chromosomes found in the genes
B. nucleus found in the chromosomes
C. genetic material found in the nucleus
D. genes found in the cytoplasm
Answer: the answer is C hope it helps
Explanation:
PLEASE PLEASE ANSERR THIS PLEASEEEE
Answer:
I think it is c
Explanation:
A 30.0 mL sample of 0.200 M Ba(OH)2 is titrated with 0.100 M HCl.
a) Determine the pH of the solution before the addition of HCl.
b) Determine the pH of the solution after the addition of 25.0 mL HCl.
Answer:
what's the question? is it A
A 30.0 ml sample of 0.200 M Ba(OH)2 is titrated with 0.100 M HCl. teh pH will be:
a) The pH of the solution before the addition of HCl is 13.301.
b) The pH of the solution after the addition of 25.0 mL HCl is 13.494.
What is pH?pH is potential hydrogen. It is the measurement of the acidity and basicity of any solution.
a)
[tex]\rm Ba(OH)_2 = Ba_2+ + 2OH^-Ba(OH)_2[/tex]
Given, [OH¯] = 0.200 M
pOH = -log 0.200 = 0.699
pH = 14.000 - pOH = 14.000 - 0.699 = 13.301
b)
Now 25 ml HCl is added
0.025 × 0.100 = 0.0025
Moles of OH = 0.02 × 0.0025 = 0.0005
Remaining OH = 0.0025 – 0.0005 = 0.00245
Now calculate the pH
0.055 is divided by 0.200 = 0.275
pOH = -log 0.275 = 0.5606
pH = 14.000 - 0.5606 = 13.4394
Thus, a) 13.301.
b) 13.4394.
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Determine the mass of CaCl2·2H2O(MW 147.02g/mole) to weigh out using a four-place analytical balance to prepare 100mL of a 0.1005M solution of Ca2+.
Answer:
1.4776 g
Explanation:
First, let us determine the number of moles present in 100 mL of 0.1005 M solution of Ca2+.
mole = molarity x volume in Liter
mole of Ca2+ = 0.1005 x 0.1 = 0.01005
Also,
mole = mass/molar mass
mass of 0.01005 mole Ca2+ = mole x molar mass
= 0.01005 x 147.02 = 1.4776 g
Since 1 mole of Ca2+ is present is 1 mole of CaCl2·2H2O, 1.4776 g of CaCl2·2H2O would be weighed out in order to prepare 00mL of a 0.1005M solution of Ca2+.
To prepare a 100 mL solution of 0.1005 M [tex]Ca^2^+[/tex], we would need to weigh out approximately 14.737 grams of [tex]CaCl_2.2H_2O[/tex].
We must use the molar mass and molarity formula to calculate the mass of [tex]CaCl_2.2H_2O[/tex] needed to make a 0.1005 M solution of [tex]Ca^2^+[/tex].
Let's start by figuring out how many moles of [tex]Ca^2^+[/tex]are needed for the solution:
Molarity (M) = moles/volume (L)
0.1005 M = x moles/0.1 L (100 mL converted to liters)
x = 0.1005 moles of [tex]Ca^2^+[/tex]
So, the molar mass of [tex]CaCl_2.2H_2O[/tex]:
Ca (40.08 g/mol) + 2Cl (35.45 g/mol) + 2([tex]H_2O[/tex]) (2 * 18.02 g/mol) = 147.02 g/mol
Then, we calculate the mass
Mass = moles * molar mass
Mass = 0.1005 moles * 147.02 g/mol
Mass = 14.737 grams
Therefore, to prepare a 100 mL solution of 0.1005 M [tex]Ca^2^+[/tex], we would need to weigh out approximately 14.737 grams of [tex]CaCl_2.2H_2O[/tex].
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How did Altair begin
Answer:
Altaïr is an ancestor (on the maternal side) of Desmond Miles, a modern-day assassin. He was trained in the Masyaf Castle in Syria by Al Mualim, his guardian since childhood.
Explanation:
When you consume food, it goes through mechanical and chemical digestion in the mouth and is then transported to the
stomach. It then mixes with stomach acid and other enzymes. What type of digestion is taking place within the stomach?
Physical change
Absorption
Mechanical digestion
Chemical digestion
Answer:
Chemical digestion
Explanation:
The type of digestion taking place within the stomach is chemical digestion. When food reacts with stomach acids and other enzymes, a reaction takes place which reduces the food into simpler bits.
The stomach contains strong digestive acids. Cells in the stomach secrete hydrochloric acid to further aid the digestion of the food. This way, complex organic molecules becomes broken down into simpler units.If you put hydrogen (H1+) and Hydroxide (OH1) together what it’s it called?
Answer:
The hydroxyl ions (OH-) released will combine with any hydrogen ions (H+) in the solution to form water molecules (OH- + H+ = H2O).
Explanation:
Which of the following gives a buffer solution when equal volumes of the two solutions are mixed?a. 0.20 MHF and 0.10 MNaOH.b. 0.10 MHF and 0.10 MNaOH.c. 0.10 MHF and 0.10 MNaF.d. 0.10 MHCl and 0.20 MNaF.
Answer:
a. 0.20 M HF and 0.10 M NaOH.
c. 0.10 M HF and 0.10 M NaF
d. 0.10 M HCl and 0.20 M NaF.
Explanation:
A buffer solution consists of a weak acid and its conjugate base, or of a weak base and its conjugate acid.
In this case, HF is the weak acid and F⁻ is its conjugate base.
Let's go case-by-case:
a. 0.20 M HF and 0.10 M NaOH.
Some -but not all- HF will react and produce F⁻, leaving a buffer solution.b. 0.10 M HF and 0.10 M NaOH.
All HF will react, not a buffer solution.c. 0.10 M HF and 0.10 M NaF.
There's no reaction, and both HF and F⁻ are directly added, it is a buffer solution.d. 0.10 M HCl and 0.20 M NaF.
Some F⁻ will react and produce HF, leaving a buffer solution.The correct answers are A), C) and D).
HELPPP!!!
Empty chemical containers may be re-used for storing food or water after thorough washing.
False
True
Answer:
False
Explanation:
That would still be very unsafe
Answer:
False
Explanation:
even thought it may be washed completely certain chemicals can still remain and be harmful when you consume the food that is put into. Especially if you add heat or cold to the container.
Someone please help! Hurry
Incorrect
Question 8
0/5 pts
(03.03 MC)
The diagram below represents a convection cell. The arrows
indicate the direction of air flow:
Need HELP HURRY
Identify the reactants in the reaction HCl + NaOH → NaCl + H20.
A. HCl and NaOH
B. NaCl and H20
C. Na and CI
D. H and cl
The reactants in the reaction HCl + NaOH → NaCl + H₂0 are HCI and NaOH Hence, Option (A) is correct
What is Reactant ?
The substance(s) to the left of the arrow in a chemical equation are called reactants.
A reactant is a substance that is present at the start of a chemical reaction.
In the given case, HCI and NaOH are the reactants, they both react to form the products, which are NaCl and H₂0.
Therefore,The reactants in the reaction HCl + NaOH → NaCl + H₂0 are HCI and NaOH Hence, Option (A) is correct
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Explain how the petrol and bitumen fractions differ in their properties and uses. (6 marks)
Explanation:
petrol or bitumen and at least one use of petrol and at least one use of bitumen eg petrol has a lower boiling point and is used as a fuel in cars, bitumen is more viscous and is used to surface roads.Aug 19, 2015
Petrol and bitumen fractions differ in their properties and uses in a number of ways with regard to melting point, viscosity, ignition ,combustion .
What is the difference between petrol and bitumen fractions?Petrol has less number of carbon chains while bitumen has large number of carbon chains.Bitumen has higher melting and boiling point as compared to petrol.
Petrol has higher viscosity as compared to bitumen.It combusts easily while bitumen does not combust completely ,it produces large number of carbon monoxide or soot.
Petrol fractions are used in cars,motorbikes,etc. while bitumen fractions are used in road surfaces and roofing. Boiling point of petrol is 35-70°C while that of bitumen is 700°C.Bitumen is more viscous as compared to petrol.
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in order to produce an electric current in a coil of wire , a magnet field through the coil must be
Answer:
moving
Explanation:
In order to produce an electric current in a coil of wire, a magnet field through the coil must be moving.
What is electromagnetic induction?Electromagnetic induction is a process in which electric field is produced due to the change in the value of magnetic field.
So, for the production of an electric current in a coil of wire, a magnet field should be moving through the coil of wire. Process of this electromegnetism get clear through the below attached image.
Hence magnetic field should be moving.
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Which is the best example for genetic diversity?
Answer:
Genetic Diversity Examples
Different breeds of dogs. ...Different varieties of rose flower, wheat, etc.There are more than 50,000 varieties of rice and more than a thousand varieties of mangoes found in India.Genetic diversity is the total number of genetic characteristics in the genetic makeup of a species, it ranges widely from the number of species to differences within species and can be attributed to the span of survival for a species.
Explanation:
i hope this helps u.
