Hydrochloric acid can cause damage if it comes into contact with your lungs, eyes, stomach, or skin. If hydrochloric acid comes into contact with your skin, it can cause: chemical burns. scarring.
When 3.93 grams of lactic acid, CHoOs(s), are burned in a bomb
calorimeter that has a total heat capacity of 10.80 kJ-K-1, the
temperature of the calorimeter increases by 5.43 K. Assume AHrxn
=
AErxn. Given that AH°f of H¿O(I) = -285.8 kJ-mol-1 and AH°f of CO:(g)
= -393.5 kJ• mol-1, calculate the AH°f of lactic acid.
The heat released in the combustion of lactic acid is absorbed by the
calorimeter and in the decomposition of the lactic acid.
ΔH°f of lactic acid is approximately -716.2 kJ
Reasons:
Known parameters are;
Mass of the lactic acid = 3.93 grams
Heat capacity of the bomb calorimeter = 10.80 kJ·K⁻¹
Change in temperature of the calorimeter, ΔT = 5.34 K
ΔHrxn = ΔErxn
ΔH°f of H₂O(l) = -285.8 kJ·mol⁻¹
ΔH°f of CO₂(g) = -393.5 kJ·mol⁻¹
The chemical equation for the reaction is presented as follows;
C₃H₆O₃ + 2O₂ → 3CO₂ + 3H₂OThe heat of the reaction = 10.80 kJ·K⁻¹ × 5.34 K = 57.672 kJ
Molar mass of C₃H₆O₃ = 90.07 g/mol
Number of moles of C₃H₆O₃ = [tex]\dfrac{3.93 \, g}{90.07 \, g/mol}[/tex] = 0.043633 moles
Number of moles of CO₂ produced = 3 × 0.043633 moles = 0.130899 moles
Heat produced = 0.130899 mole × -285.8 kJ·mol⁻¹ = -37.4109342 kJ
Moles of H₂O produced = 0.130899 moles
Heat produced = 0.130899 mole × -393.5 ≈ -51.51 kJ
Therefore, we have;
Heat absorbed by the lactic acid = ΔH°f of H₂O + ΔH°f of CO₂ + Heat absorbed by the calorimeter
Which gives;
Heat absorbed by lactic acid = -37.4109342 kJ - 51.51 kJ + 57.672 kJ ≈ -31.249 kJ
The heat absorbed by the lactic acid ≈ -31.249 kJ
[tex]\Delta H^{\circ}f \ of \ C_3H_6O_3 = \dfrac{-31.249}{0.043633} \approx -716.2[/tex]
ΔH°f of C₃H₆O₃ ≈ -716.2 kJ
Heat of formation of lactic acid ≈ -716.2 kJ.
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How do Hydrogen-1, Hydrogen-2, and Hydrogen-3 differ from each other?
Answer:
different from the number of their neutrons
Explanation:
They each have one single proton (Z = 1), but differ in the number of their neutrons. Hydrogen has no neutron, deuterium has one, and tritium has two neutrons. ... Their nuclear symbols are therefore 1H, 2H, and 3H. The atoms of these isotopes have one electron to balance the charge of the one proton.
How many hydrogen atom are in compound NH42CO3
Answer:
There are 4 Hydrogen atoms in the compound NH42CO3
Explanation:
The "H4" is used to represent the amount of Hydrogen atoms in the compound itself, which is 4.
Rank the given objects from having the biggest size to the smallest size Blood cells , virus, atom, electrons , paper
Answer:
paper, blood cell, virus, electron, atom
Explanation:
Please help me I can’t figure it out
1. Calculate the wavelength of light with a frequency of 1.89 x 1018 Hz.
a
Answer:
1.92402 kilohertz
Explanation:
hope this helps
Answer:
• From wave equation :
[tex]{ \rm{v = f \lambda}}[/tex]
v is velocity, v = 3.0 × 10^8 m/sf is frequencylambda is the wavelength[tex]{ \rm{3.0 \times {10}^{8} = (1.89 \times {10}^{18}) \times \lambda}} \\ \\ { \rm{ \lambda = \frac{3.0 \times {10}^{8} }{1.89 \times {10}^{18} } }} \\ \\ { \boxed{ \rm{ \: \lambda = 1.587 \times {10}^{ - 10} \: }}}[/tex]
What is the mass of a baseball that has kinetic energy of 105 and is traveling at 10 m/s
Answer:
K.E =1/2 Mass×(velocity)2
Explanation:
1/2mass=K.E/Velocity 2
1/2mass=105/(10m/s)2
1/2mass=105/100m/s
1/2mass=21/20m/s
mass=21/20m/s ×2
mass=21/10
mass=2.1 Kilogram (put the value)
Identify the one thing that you were most surprised by in the quiz. Explain
why.
Adhesion is the attraction of molecules of one kind for molecules of a different kind... water is adhesive because the water molecules are attracted to the straw and therefore adhere to it. Thus, adhesive forces are important for sustaining life. This is because of these forces, water can flow up from the roots to the tops of plants to feed the plant, allowing it to move against gravity through plant cells. Another example of why its important that water is adhesive is the movement of water to the tops of trees and the drainage of tears from tear ducts in the corners of your eyes. Or how water droplets stick to the end of the pine needles. These are all examples of adhesion.
Hope this helped you- have a good day bro cya)
Describe how you could show by adding aqueous sodium hydroxide and aqueous ammonia that a solution contained zinc ions.
Result with sodium hydroxide
Excess sodium hydroxide
Result with aqueous ammonia
Excess aqueous ammonia
Answer:
*result with sodium hydroxide: white ppt of Zn(OH)2
*excess sodium hydroxide: Precipitate dissolves to form a COLOURLESS solution
*Result with Aqueous ammonia: White ppt of Zn(OH)2
*excess aqueous ammonia: Precipitate dissolves to form a COLOURLESS solution
explain the role of sulphuric acid in limit test for iron
Compost from vegetable peelings can be used as plant fertilizer. * a. reduce b. resuse c. recycle d. recover
Answer:
Is letter B
Explanation:
Hope it helps :))
What is metabolism? I know the answer.
Answer:
Metabolism is the set of life-sustaining chemical reactions in organisms. The three main purposes of metabolism are: the conversion of the energy in food to energy available to run cellular processes
Explanation:
where does fertilization occurs in human beings
In human beings fertilization occurs in fallopian tube
Answer:
Fertilization usually takes place in a fallopian tube that links an ovary to the uterus. If the fertilized egg successfully travels down the fallopian tube and implants in the uterus, an embryo starts growing.
does ch3 have resonance structure?
Answer:
yes
Explanation:
if u watch or look closely u will observe it
The CH₃ has resonance structures as it has odd number of hydrogen atoms.
In chemistry, resonance, also called mesomerism, is a way of describing bonding in certain molecules or polyatomic ions by the combination of several contributing structures ,also variously known as resonance structures or canonical structures into a resonance hybrid (or hybrid structure) in valence bond theory. It has particular value for analyzing delocalized electrons where the bonding cannot be expressed by one single Lewis structure.
Thus, CH₃ has resonance structures as it has odd number of hydrogen atoms.
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Substance whose smell changes in acidic or basic solutions
Answer:
Olfactory indicators
Explanation:
The substance whose odour changes in an acidic of basic medium are called olfactory indicators. In an olfactory indicator , smell varies depending on whether it is mixed with an acidic or basic solution.
Calculate the pOH of an aqueous solution of .0.073 M LiOH
Considering the definition of pOH and strong base, the pOH of the aqueous solution is 1.14
The pOH (or potential OH) is a measure of the basicity or alkalinity of a solution and indicates the concentration of ion hydroxide (OH-).
pOH is expressed as the logarithm of the concentration of OH⁻ ions, with the sign changed:
pOH= - log [OH⁻]
On the other hand, a strong base is that base that in an aqueous solution completely dissociates between the cation and OH-.
LiOH is a strong base, so the concentration of the hydroxide will be equal to the concentration of OH-. This is:
[LiOH]= [OH-]= 0.073 M
Replacing in the definition of pOH:
pOH= -log (0.073 M)
pOH= 1.14
In summary, the pOH of the aqueous solution is 1.14
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brainly.com/question/16032912?referrer=searchResults brainly.com/question/13557815?referrer=searchResultsIncreasing the frequency _________________ the wavelength. Group of answer choices decreases increases does not change
Answer:
heightens
Explanation:
I may need some help with this one
Answer:
ssihh add then htit da
Explanation:
can someone help me please ... god will bless u if u help...it is very urgent... i only have 1hr to answer this question
Answer:
iuiwusiwuiqihihiuwusbhwubduywbduywbudb me no esspanlo
Explanation:
niuniniuniuniun
Element is in group 15. Element Y is in group 17. Both of these elements are
In the compound XY3, there are
shared electron pairs.
Answer:
join id(8606512121) pas(12345)
What will happen to the pH of sodium bicarbonate if vinegar is added to it?
Answer:
The overall chemical reaction between baking soda (sodium bicarbonate) and vinegar (weak acetic acid) is one mole of solid sodium bicarbonate reacts with one mole of liquid acetic acid to produce one mole each of carbon dioxide gas, liquid water, sodium ions, and acetate ions. The reaction proceeds in two steps
How many atoms of Xe does 7.84 moles of Xe contain?
Why do both nuclear and chemical
changes occur?
Answer:
The change in energy for a chemical reaction has to do with the potential energy of the electrons. The change in energy for a nuclear reaction has to do with the potential energy of the nucleus. The change in energy for a nuclear change is many orders of magnitude larger than for a chemical change.
The statement that describes both nuclear and chemical changes occur is "potential energy."
What is nuclear and chemical reaction?Nuclear reactions include a change in the nucleus of an atom, which usually results in the production of a different element. Chemical reactions, on the other hand, require just electron rearrangement and no changes in nuclei.
A nuclear reaction is any reaction that causes the nucleus of an atom to change. An atom's nucleus is made up of protons and neutrons. It seems to reason that a nuclear reaction alters the amount of protons and/or neutrons in an atom.
Chemical changes occur when bonds between molecules or atoms are broken and/or formed to form a new material. In this case, the new substances' qualities differ from the old, the particles differ, and the number of particles can alter.
The change in energy for a nuclear change is many orders of magnitude greater than the change in energy for a chemical change.
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how many gallons in one cubic foot?
Answer:
1cf gallon=7.481 us liquid gallon
Select the statements that correctly describe an asteroid. Check all that apply
Largest of the space rocks found orbiting the Sun.
Smallest of the space rocks found orbiting the Sun.
most are found between Mars and Jupiter
most are found between Jupiter and Saturn
Answer:
Explanation:
Most of this ancient space rubble can be found orbiting the Sun between Mars and Jupiter within the main asteroid belt. Asteroids range in size from Vesta – the largest at about 329 miles (530 kilometers) in diameter – to bodies that are less than 33 feet (10 meters) across.
Which two phrases describe the movement of thermal energy due to
convection currents in the water on Earth?
O A. From the bottom of the ocean to the surface
B. From the surface of the ocean to the bottom
C. From cooler parts of Earth to the equator
D. From the equator to cooler parts of Earth
Answer:
D. From the equator to cooler parts of Earth
Explanation:
Thermal energy is always transferred from an area with a higher temperature to an area with a lower temperature. Moving particles transfer thermal energy through a fluid by forming convection currents.
Answer:
B. From the surface of the ocean to the bottom
D. From the equator to cooler parts of Earth
Explanation:
Test approved
how many grams are present in 0.885 moles of manganese?
A. 48.6g
B. 62.1 g
C. 27.5 g
D. 0.016g
E. 21.5g
As per the details given, 48.6 g are present in 0.885 moles of manganese. The correct option is A.
To determine the gram contained in a given number of moles, use the element's molar mass. Manganese (Mn) has a molar mass of roughly 54.94 g/mol.
To calculate the grammes in 0.885 moles of manganese, use the following formula:
moles of Mn × molar mass of Mn = mass of Mn in grams
On calculating it:
0.885 moles × 54.94 g/mol = 48.60 g
Therefore, the mass of manganese present in 0.885 moles of manganese is 48.60 grams.
Thus, the correct answer is A. 48.6g.
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(iii) Explain why magnesium chloride has a high melting point.
Answer:
magnesium chlorides are solids with high melting and boiling points because of the large amount of heat which is needed to break the strong ionic attractions.
Explanation:
These magnesium ions have more than one charge (2+). These highly charged ions will attract other ions more strongly than ions with one charge, therefore more energy will be needed to overcome the electrostatic forces of attraction and so the melting points will be higher.
When the electron from the n=4 excited state drops to the ground state, does it absorb energy or emit energy?
Answer:
It emits energy since to move from a higher energy level to a lower energy level or ground state, it must lose energy.
explain why an atom can only emit specific wavelengths of light and not every possible wavelength
Answer:
The electrons in an atom can only occupy certain allowed energy levels to a lower one, the excess energy is emitted as a photon of light, with its wavelength dependent on the change in electron energy. This is why an atom can only emit specific wavelengths of light and not every possible wavelength.
helppppppppppppppppppppppppppp
Answer:
C is the correct option.
Explanation:
When water reaches 100°C it starts evaporating and the molecules of water turns to vapor.