Answer: The moles of melatonin are 0.000043
Explanation:
According to avogadro's law, 1 mole of every substance weighs equal to its molecular mass and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}[/tex]
Given mass of melatonin = 0.01 g
Molar mass of melatonin [tex](C_{13}H_{16}N_2O_2)[/tex] = 232.28 g/mol
[tex]\text{Number of moles of melatonin}=\frac{0.01 g}{232.28g/mol}=0.000043mol[/tex]
Thus the moles of melatonin in 0.01 g are 0.000043
can send me the answer plzzz
Answer: In balancing any chemical equations, the number of atoms of each elements on the reactant side is equals to the number of atoms of the elements on the product side.
Explanation:
Balanced Chemical equations are those equations that has the equal number of atoms of elements on both the reactants and the product sides. To ensure that the chemical equations are correctly balanced the following steps should be observed.
--> identify the elements on the reactant side and on the product side
--> identify the number of atoms of each elements.
--> multiply the number of atoms with the number that will give you a coefficient that will make both the reactant and product sides equal.
--> place the new numbers infront of the elements or compounds.
--> A final check is done to know if the equation is balanced.
From the above steps, the balanced equation of the above questions are listed below:
1.) AlBr3 + 3K ---> 3KBr + Al
2.) FeO + PdF2 --> FeF2 + PdO
3.) P4 + 6Br2 --> 4PBr3
4.) 2LiCl + Br2 --> 2LiBr + Cl2
5.) PbBr2 + 2HCl --> 2HBr + PbCl2
6.) 2CoBr3 + 3CaSO4 --> 3CaBr2 + Co2(SO4)3
7.) 2Na3P + 3CaF2 --> 6NaF + Ca3P2
8.) 2Mn + 6HI --> 3H2 + 2MnI3
9.) Li3PO4 + 3NaBr --> Na3PO4 + 3LiBr
10.) CaF2 + Li2SO4 --> CaSO4 + 2LiF
11.) 2HBr + Mg(OH)2 --> MgBr2 + 2H2O
12.) 2LiNO3 + CaBr2 --> Ca(NO3)2 + 2LiBr
13.) AgNO3 + Li --> LiNO3 +Ag
14.) Si(OH)4 + 4NaBr --> SiBr4 + 4NaOH
15.) 2NaCN + CuCO3 --> Na2CO3 + Cu(CN)2
16.) 2NH3 + H2SO4 --> (NH4)2SO4
How many grams of Ca metal are produced by the electrolysis of molten CaBr2 using a current of 30.0 amp for
5.50 hours?
Answer: 123 g
Explanation: Q =It = nzF. For Ca^2+ z= 2, t = 5.5 x 3600 s and I = 30.0
And F= 96485 As/mol
Amount of moles is n = It /zF = 3.078 mol , multiply with atomic mass 40.08 g/mol
Metamorphic rock usually forms
Answer:
Metamorphic rocks form sedimets
A pool float was filled with air to capacity in the middle of a hot day. The next morning the pool float looked different yet no gas escaped or entered the float. Describe what you think the float looked like in the morning and why it occurred.
Answer:
The pool float looked would have looked deflated the next morning.
Explanation:
When temperature decreases the volume decreases.
Drought is a weather condition. true or false
Answer:
true
Explanation:
drought is a period of unusually persistent dry weather that persists long enough to cause serious problems such as crop damage and/or water supply shortages. The severity of the drought depends upon the degree of moisture deficiency, the duration, and the size of the affected area.
Which substance is an Arrhenius acid?
A) HBr
B) NaBr
C) NaOH
D) NH3
Answer:
A
Explanation:
Answer:a
Explanation:
The air pressure inside a balloon is 0.783 atm. What is this pressure in mmHg?
Do not include units in your answer.
Answer:
It is the same it does not change
Explanation:
Please help as soon as possible
The molecules of which of the following would have the most kinetic energy?
A
boiling water
B
a cold glass of water
C
a warm cup of tea
D
an ice cube
Answer:
A
boiling water
Explanation:
The boiling point of water is 212 degrees F. Due to the temperature of the water being this high, the particles are sped up since heat increases kinectic energy.
What is the element of H₂O
Answer:
It’s water bro
Explanation:
New concept cars in the Detroit Auto Show feature engines that burn hydrogen gas in air to produce water vapor. Suppose that fuel tank contains 150. L of H2 gas at 20.0 atm pressure at 25.0˚C. If all of this gas is burned, what mass (in grams) of water vapor is produced?
Answer:
247.2g
Explanation:
Using the general gas law equation as follows:
PV = nRT
Where;
P = pressure (atm)
V = volume (L)
n = number of moles (mol)
R = gas law constant (0.0821 Latm/molK)
T = temperature (K)
According to the information in this question, a fuel tank contains 150. L (V) of H2 gas at 20.0 atm (P) at 25.0˚C (T)
Temperature = 25°C = 25 + 273 = 298K
Using PV = nRT
20 × 150 = n × 0.0821 × 298
3000 = 24.4658n
n = 3000/24.4658
n = 122.62
n = 122.6mol
Using the formula, mole = mass/molar mass, to find the mass of H2 gas.
Molar mass of H2 = 1.008(2)
= 2.016g/mol
122.6 = mass/2.016
mass = 122.6 × 2.016
mass = 247.2g.
Calculate the pOH of a 7.68x10-7 M HCl solution.
pOH = (round to 3 sig figs)
Answer:
pOH = 7.89
Explanation:
As HCl is a strong acid, [H⁺] is equal to the original acid concentration. In other words:
[H⁺] = 7.68x10⁻⁷ MKnowing [H⁺], we calculate the pH of the solution:
pH = -log[H⁺]pH = 6.11With the pH, we can calculate the pOH of the solution, using the following formula:
pOH = 14 - pHpOH = 7.89All you need to know about CO2?
Answer:
Carbon is an element that's found all over the world and in every living thing. Oxygen is another element that's in the air we breathe. When carbon and oxygen bond together, they form a colorless, odorless gas called carbon dioxide, which is a heat-trapping greenhouse gas. Whenever we burn fossil fuels such as coal, oil, and natural gas—whether it's to drive our cars, use electricity, or make products—we are producing carbon dioxide.
The atmosphere isn't the only part of the Earth that has carbon. The oceans store large amounts of carbon, and so do plants, soil, and deposits of coal, oil, and natural gas deep underground. Carbon naturally moves from one part of the Earth to another through the carbon cycle. But right now, by burning fossil fuels, people are adding carbon to the atmosphere (in the form of carbon dioxide) faster than natural processes can remove it. That's why the amount of carbon dioxide in the atmosphere is increasing, which is causing global climate change.
Explanation:
How many atoms are in 34.2 grams of carbon?
Answer:
6.02*1022
Explanation:
I don't know why
How would you expect the reaction profile of an endothermic reaction to look?
a. The reactants have more energy than the products.
b. The products have more energy than the reactants.
c. There is no activation energy.
d. The reactants and the products have the same energy.
Answer:
B. the products have more energy than the reactants.
100 pts Horticulture (HURRY)
Which of the following facets of IPM control systems is most likely to focus on the diversion of pests from a commercial crop?
monitoring
avoidance
suppression
prevention
Answer:
Suppression
Explanation:
suppression is used to reduce pest populations below the economic threshold if prevention and avoidance tactics have failed--chemical, bio and cultural and other tactics are used which minimize environmental impacts
Answer:
i know im late again but its suppression
Explanation:
structure of periodic table explain
Explanation:
Elements are arranged from left to right and top to bottom in order of increasing atomic number. ... The number of electrons in a period increases as one moves down the periodic table; therefore, as the energy level of the atom increases, the number of energy sub-levels per energy level increases.
differentiate between a promoter and an inhibitor
Promoters are substances that increase the catalytic activity, even though they are not catalysts by themselves.
Inhibitors are sometimes referred to as "negative catalysts" since they decrease the reaction rate.
This catastrophic event hit Sumatra in 2004 and again in 2005, destroying huge amounts of property and killing thousands of people. It is an event generated by earthquakes. It is a A) tsunami. B) tornado. C) hurricane. D) water spout.
Answer: A
Explanation: I hope this helps!
Answer:
A or C. Best to go with A
Explanation:
Hope it works!!
An -ate or -ite at the end of a compound name usually indicates that the compound contains *
fewer electrons than protons.
neutral molecules.
only two elements.
a polyatomic anion.
Explanation:
1.-Ate-contains 3 elements in which one is oxygen2.-ite-contains 3 elements in which one is Oxygen but the oxygen is less than that of -Ate3.-ide has 2 elementsPLEASE SOMEONE HELP dont mind the answers in there already
Answer:
4. Daughter nuclide
5. Fusion
6. Strong nuclear force
Explanation:
4. When an atom of an element decays to a new element, the new element is called the
In a radioactive decay in nuclear physics, the product of the decay which is usually smaller (loss in mass) than its source and may or may not be radioactive is the daughter nuclide. Its source is the parent nuclide
5. Nuclear fusion is the nuclear process that involves the combination of two or more (light) atoms to produce subatomic particles and one or more atomic nucleus accompanied by an emission or absorption of energy due to the difference between the weight of the reactants and the weight of the products
The given reaction, is presented as follows;
³₂He + ¹₁H → ⁴₂He + ⁰₁e
Therefore, given that two atoms, (³₂He and ¹₁H) combine to form one atom (⁴₂He) and a subatomic electron particle (⁰₁e), the reaction is a fusion reaction
6. What keeps a nucleus together
The nucleus is made of neutrons and protons. There is an attractive nuclear force between protons and neutrons and a repulsive electromagnetic force between two or more protons. However, due to the proximity of the of the neutrons and the protons, which are together known as the nucleons, the attractive nuclear force is stronger than the electromagnetic force pushing the protons away from each other and the nucleus is kept together
Therefore, the strong nuclear force keeps the nucleus together.
4.6 moles of a gas are at a temperature of 325 K and a volume of 96.8 L, what is the pressure of the ga
Answer:
1.3 atm
Explanation:
Apply the ideal gas law: PV = nRT
Since we need to find the pressure, solve for pressure:
P = nRT / V
Plug in our given values of n = 4.6 moles, R = 0.08206 (ideal gas law constant using atm), T = 325 K, and V = 96.8 L:
P = 4.6(0.08206)(325) / 96.8 = 1.267 atm -> 1.3 atm (two significant figures)
The speed of sound in air is four times as its speed in steel true or false?
Answer:
.....false
Explanation:
the particles in the air are packed apart whereas the particles in steel are closely packed and sound travel faster in solids than in gasses..
Answer:
False
Explanation:
The speed of sound is quickest in mediums that have their molecules close apart. The speed of sounds is quickest in solids, followed by liquids, and slowest in gasses. The close the molecules are together, the quicker sound travels. The sound would travel faster in the steel than in the air.
This is due to the fact that sound waves are compression waves. This means that they rely on the way molecules collide with one another and act sort of like a spring.
Fun fact: In the old days, people used to put their ears to the train tracks to see if a train is coming. Sound moves so fast in metal that they can sense the vibrations miles before the train arrived.
Please mark this as brainliest if this helped you!
the mass of a subatomic particle compared to the mass of a proton
Answer:
neutron
Explanation:
Hopefully this will help you!!!!
Does wasting water also waste energy? Explain your reasoning.
Answer:
Yes.
Explanation:
Wasting household water does not ultimately remove that water from the global water cycle, but it does remove it from the portion of the water cycle that is readily accessible and usable by humans. Also, "wasting" water wastes the energy and resources that were used to process and deliver the water.
Answer:
I feel like there should be more parts to this question but I think it depends on how you got your water. If you waste water after you got it from a local stream yourself, you wasted your body energy but no real electricity of any kind. If the water is processed and filtered and you end up wasting it, I guess it counts as energy being wasted too? Because the sole purpose was to bring you clean water but you didn't utilize it
The fastest man on Earth, Usain Bolt, runs at a speed of 10 meters per second. How
long would it take him to run 160 meters?
differentiate between homogenous and heterogeneous catalysis
Explanation:
Homogeneous catalysts are those that occupy the same phase as the reaction mixture (typically liquid or gas), while heterogeneous catalysts occupy a different phase. Generally, heterogeneous catalysts are solid compounds that are added to liquid or gas reaction mixtures.
If you have a car that gets 30 miles to the gallon and fuel currently costs $2.60 a gallon, how many miles can you drive if you have 5$ worth of fuel?
Answer:
57.7 miles.
Explanation:
Hello there!
In this case, according to the given information, it is possible to set up the initial miles-cost ratio as shown below:
[tex]\frac{30mi}{\$2.60}[/tex]
Thus, we can find the the driven miles with $5 by multiplying as follows:
[tex]\frac{30mi}{\$2.60} *\$5\\\\=57.7mi[/tex]
Best regards!
The miles' the car can run with the fuel cost $5 has been 57.69 miles.
The given car run for a 30 miles by 1 gallon of the fuel. The given cost of fuel has been $2.60. Thus, for 30 miles, the cost of fuel has been driven to be $2.60.
The miles that can be driven by the car with $5 has been given by unitary method. The expression has been driven as:
[tex]\$2.60=30\;\rm miles\\\$5=\dfrac{30}{2.60}\;\times\;5\;miles\\\$5=57.69\;miles[/tex]
The miles' the car can run with the fuel cost $5 has been 57.69 miles.
For more information about unitary method, refer to the link:
https://brainly.com/question/11859405
What is an Ore? ufhfjfnf
Answer:
ore is naturally occuring solid material from which a metal or valuable mineral can be extracted
profitably.
Melatonin has the chemical formula C13H16N2O2. Less than 10 milligrams(0.01g) Convert the melatonin to moles
Answer: There are 0.000043 moles of melatonin.
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}[/tex]
given mass = 10 mg = 0.01 g
molar mass of [tex]C_{13}H_{16}N_2O_2[/tex] = 232.28 g
[tex]{\text {moles of melatonin}}=\frac{0.01g}{232.28g/mol}=0.000043moles[/tex]
Thus there are 0.000043 moles of melatonin
What is the molality of a solution that contains 435 grams of Fe(ClO 2 3)3 , in 750.0 g of solvent?
Answer:
2.24 M
Explanation:
Molality is a measure of molar concentration of a solution and it can be calculated using the formula;
Molality = mole of solute ÷ kg of solvent
To calculate the number of moles present in the solute, we use the formula;
mole = mass ÷ molar mass
Molar mass of Fe(ClO2)3 = 56 + {35.5 + 16(2)}3
= 56 + (35.5 + 32)3
= 56 + (67.5)3
= 56 + 202.5
= 258.5g/mol
mole = 435/258.5
mole of Fe(ClO2)3 = 1.68mol
750g of solvent = 750/1000 = 0.750kg of solvent
Molality of the solution is thus: 1.68/0.750
Molality = 2.24 M.