There are 100 mg of caffeine in a shot of espresso. The chemical formula
for caffeine is C8H10N402. How many moles of carbon are present in the
caffeine in a shot of espresso?
there are 8 moles of carbon in the molecule because the ratio of carbon per the whole caffine molecule is 8 carbon atoms: 1 molecule of caffine so in terms of moles that's 8:1 :)
Answer:
Solve a problem with the first 100th on my phone and the phone is a bit annoying and I have to use it to get the battery back.
Why is the? The second ionization energy of sodium is about three times greater than the second ionization energy of magnesium
Answer:
~Na+1 is already in the preferred form. Because of this, the second ionization energy of sodium is higher than normal. Mg+1 loses an electron to form s2 p6 .
1. Which option correctly describes the reactants and products of a chemical reaction?A The mass of the reactants must be equal to the mass of the products. The total number of moles of the reactants can be more or less than the total number of moles of the products.
B The mass of the reactants can be more or less than the mass of the products. The total number of moles of the reactants must be equal to the total number of moles of the products.
C The mass of the reactants can be more or less than the mass of the products. The total number of moles of the reactants can also be more or less than the total number of moles of the products.
D The mass of the reactants must be equal to the mass of the products. The total number of moles of the reactants must also be equal to the total number of moles of the products.
The statement which correctly describes the reactants and products of a chemical reaction is: A. The mass of the reactants must be equal to the mass of the products. The total number of moles of the reactants can be more or less than the total number of moles of the products.
What is LOCOM?LOCOM is an abbreviation for the law of conservation of mass and it states that mass is neither created nor destroyed in any chemical reaction. Thus, the mass of any substance in a balanced chemical equation would remain the same at the end.
According to the law of conservation of mass (LOCOM), the mass of all the reacting chemical elements of any substance (reactants) must be equal to the mass of the product formed during a chemical reaction.
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Convert 220 grams of co2 into moles.
Answer:
5 moles
Explanation:
By convert grams to moles u need to divided the number of grams to the molar mass
220 ÷ 44.01 = 4.9 ≈ 5.0
A gas occupies a volume of 567 mL at 35. 0 oC and 99 kPa. What is the volume of the gas at 273
K and 101. 3 kPa?
Answer:
0.00 °C = 273 K. 1.00 atm = 760.0 mm Hg = 101.325 kPa = 101,325 Pa. 273 1.
Explanation:
Which choice describes climate? In March 1971, Canada was hit by a major blizzard and up to 32 inches of snow fell. The U.S. gulf coast was hit by Hurricane Katrina in 2005 and suffered extensive damage. The U.S. gulf coast typically has warm, wet weather and tropical storms during the summer and fall. An extremely dangerous tornado hit Jarrell, Texas in 1997 destroying 40 homes.
Answer:
Its C
Explanation:
If you look, you can see that it tells you the humidity and the that its warm but it also tells you that it storms a little to and that makes it easier to know the climate but if it just sayed it was warm that wouldn't be enough information
CAN I PLS HAVE BRAINLIEST. I NEVER GET IT. ITS A LITTLE CROWN UNDER MY ANSWER. PLS. ILL GIVE YOU BRAINLIEST JUST PLS
Will give brainliest... what is the [OH-] of a solution whose pOH is equal to 2.86
Answer:
the pOH of a solution is the negative logarithm of the hydroxide-ion concentration. by this yields a [OH − ] of 1.0 × 10 -10 M. Finally the pOH of the solution equals -log(1.0 × 10 -10 ) = 10.Explanation:
The concentration of hydroxide ion of a solution whose pOH value is equal to 2.86 is 1.38×10⁻³ M.
How do we calculate the concentration of OH⁻?Concentration of hydroxide ion will be calculated by using the pOH value by using the below equation as:
pOH = -log[OH⁻]
[OH⁻] = [tex]10^{-pOH}[/tex]
Given that value of pOH = 2.86
On putting values we get,
[OH⁻] = [tex]10^{-2.86}[/tex]
[OH⁻] = 0.00138 = 1.38×10⁻³ M
Hence concentration of hydroxide ion is 1.38×10⁻³ M.
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Which do you think will cool the fastest?
sand
water
air
metal
What is the volume of 5 moles of oxygen gas at r.t.p ?
Explanation:
[tex]5mol \times \frac{22.4lit}{1mol} = 112lit[/tex]
One year, a herd of cattle released 2.44 metric tons of CH4 (methane) into the atmosphere. How many metric tons of carbon did this methane contain
The mass, in metric tons, of carbon in the methane is 1.83 metric tons
Calculating mass in a substance
From the question, we are to determine the quantity of carbon in the methane
The mass of carbon in the methane can be calculated from
Mass of carbon in the methane = [tex]\frac{Mass\ of\ carbon\ in\ a\ molecule\ of \ methane}{Mass\ of\ a\ molecule\ of \ methane}\times Total\ mass\ of\ the\ methane[/tex]
Mass of carbon in a molecule of methane = 12 g
Mass of a molecule of methane = 16 g
Therefore,
Mass of carbon in the methane = [tex]\frac{12}{16} \times 2.44[/tex]
Mass of carbon in the methane = 1.83 metric tons
Hence, the mass, in metric tons, of carbon in the methane is 1.83 metric tons
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Type the correct answer in the box. Express your answer to three significant figures. Sodium hydroxide and magnesium chloride react as shown by this equation: 2NaOH MgCl2 → Mg(OH)2 2NaCl. Suppose the reaction begins with 637 milliliters of 1. 35 M sodium hydroxide solution and excess magnesium hydroxide. What is the theoretical yield of magnesium hydroxide if the resulting solution has a volume of 2. 82 liters? Use the periodic table and the polyatomic ion resource. The mass of magnesium hydroxide formed is grams.
25.07grams is the theoretical yield of magnesium hydroxide if the resulting solution has a volume of 2. 82 liters.
How we calculate the mass from moles?Mass of any substance will be calculated from moles as:
n = W/M, where
W = given or required mass
M = molar mass
Given chemical reaction is:
2NaOH + MgCl₂ → Mg(OH)₂ + 2NaCl
From the stoichiometry of the reaction, it is clear that:
2 moles of NaOH = produce 1 mole of Mg(OH)₂
1 mole of NaOH = produce 1/2 mole of Mg(OH)₂
Given concentration of NaOH = 1.35M
Given volume of NaOH = 637mL = 0.637L
Moles of NaOH will be calculated as:
M = n/V
n = 1.35M × 0.637L = 0.859 moles
So, 0.859 moles of NaOH = produce 0.859×1/2 = 0.429 moles of Mg(OH)₂
Now, we convert this moles into grams by using the above formula:
0.429 = W/58.31 g/mole
W = 25.07grams
Hence, 25.07grams is the theoretical yield of magnesium hydroxide.
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9. When you move your hand from a hot stove what is the stimulus you are reacting to?
Answer:
if you touch a hot stove, the nerves in your skin shoot a message of pain to your brain. The brain then sends a message back telling the muscles in your hand to pull away.
Explanation:
During a lab, 1.62g of COCl2 · x H2O were heated. After heating, only 0.88g of COCl2 remained. Calculate the formula of the hydrate.
Show your work.
You have to break down the cobalt chloride and water by finding the mass of each and using empirical formula.
Answer:
Explanation:
Let the number of moles of water in the required formula be "y".
The final formula should be in the form of : CoCl2 yH2O
1.62 g is the weight of CoCl2 and water in the sample
After heating, the remaining mass represents the mass the salt only
mass of water in sample = 1.62 - 0.88 = 0.74 g
From the periodic table:
molar mass of cobalt is 59 g
molar mass of chlorine is 35.5
molar mass of hydrogen is 1
molar mass of oxygen is 16
molar mass of formula = 59 + 2(35.5) + 18y = 130 + 18y g
Now we have calculate the mass/molar mass for each part of the formula (salt and water) and equate them to get number of moles of water as follows:
0.88 / 130 = 0.74 / y18
y = 6.07 which is approximately 6 moles
Thus, the final formula is CoCl2 6H2O. This hydrate is called cobalt(II)chloride hexahydrate.
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pLEASEEE HELPPP QUICCKKK
Answer:
a. carbonyl
Explanation:
this is acetaldehyde, and aldehydes are compounds that contain a carbonyl which is carbon double bonded with oxygen, and that carbonyl is bonded with at least one hydrogen atom.
An induced dipole-dipole interaction has been proposed between aromatic amino acid residues present in the cholinergic binding site and acetylcholine. What functional group of acetylcholine is involved?
a) the acyl methyl group.
b) the ester.
c) the ethylene bridge.
d) the quaternary ammonium head group.
Answer:
hi-
Explanation:
interaction with acetylcholine?
Aspartic acid 311
10) What amino acid in the binding site of the cholinergic receptor is involved in an ionic interaction with acetylcholine? Feedback: Aspartic acid 311 is ionised and is present in the binding site as a negatively charged aspartate ion.
A sample of calcium oxide (CaO) has a mass of 2. 80 g. The molar mass of CaO is 56. 08 g/mol. How many moles of CaO does this sample contain? 0. 0499 moles 20. 0 moles 58. 9 moles 157 moles.
In chemistry, a mole is a measuring unit of atoms, molecules, ions etc. The number of moles of calcium oxide in the sample is 0.0499 moles.
What is a mole?A mole is a ratio of mass and the molar mass of the substance. It can measure the small number of molecules, atoms, ions etc. present in the compound.
Given,
Mass of calcium oxide = 2.80 g
Molar mass = 56.08 g/mol
Moles can be calculated as:
[tex]\begin{aligned}\rm moles &= \rm \dfrac{mass}{\rm molar \; mass}\\\\&= \dfrac{2.80}{56.08}\\\\&= 0.0499\;\rm mol\end{aligned}[/tex]
Therefore, option A. 0.0499 mol is the moles of the calcium oxide.
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Answer: 0.0499
I hope this helps
2 Ca + O2 2 CaO
If this reaction occurs with 5 moles of Ca and 5 moles of O2, how much CaO will be produced?
Answer:
5mol at most
Explanation:
as we hv 5mol Ca available, the 5 mol Ca can react with 5/2 = 2.5mol O2, as we have more mol of O2 than that Ca can react with, Ca is the limiting reactant. Therefore at most 5/2x2 = 5 mol of CaO can be made
If 8.63 grams of Aluminum oxide react with Nitric acid, how many grams of water will be produced?
Taking into account the reaction stoichiometry, 4.57 grams of H₂O are formed when8.63 grams of Al₂O₃ reacts with HNO₃.
Reaction stoichiometryIn first place, the balanced reaction is:
Al₂O₃ + 6 HNO₃ → 2 Al(NO₃)₃ + 3 H₂O
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Al₂O₃: 1 mole HNO₃: 6 moles Al(NO₃)₃: 2 molesH₂O: 3 molesThe molar mass of the compounds is:
Al₂O₃: 102 g/moleHNO₃: 63 g/moleAl(NO₃)₃: 213 g/moleH₂O: 18 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
Al₂O₃: 1 mole ×102 g/mole= 102 gramsHNO₃: 6 moles ×63 g/mole= 378 gramsAl(NO₃)₃: 2 moles ×213 g/mole= 426 gramsH₂O: 3 moles ×18 g/mole= 54 gramsMass of water formedThe following rule of three can be applied: if by reaction stoichiometry 102 grams of Al₂O₃ form 54 grams of H₂O, 8.63 grams of Al₂O₃ form how much mass of H₂O?
[tex]mass H_{2} O=\frac{8.63 grams of Al_{2} O_{3} x54 grams of H_{2} O}{102 grams of Al_{2} O_{3}}[/tex]
mass of H₂O= 4.57 grams
Then, 4.57 grams of H₂O are formed when8.63 grams of Al₂O₃ reacts with HNO₃.
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chemistry help please!!!
Convert 30.0g of water to moles
please help
Answer:
1.7
Explanation:
1 grams Water to mol = 0.05551 mol
30 grams Water to mol = 1.66525 mol
if we round that up the answer is 1.7
what type of bond is present in a copper wire
Answer:
the correct answer is Metallic bonding
Explanation:
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If right you will be marked brainiest :)
Answer: They are the same species and have the same traits.
Explanation: These horses are well, the same species because they are horses. They have very similar traits.
Let me know if this is right!
Examine the picture above. What process does it represent?
Answer:
The formation of water from hydrogen and oxygen
Explanation:
Write the name of the Formula, Chromium(III) Sulfide
Answer:
Cr2S3
Explanation : Cr is +3
S is - 2 so when balancing it will give Cr2S3
1. Natural gas is considered a nonrenewable resource because
A. It takes millions of years to form.
A. It takes millions of years to form.,
B. It is very expensive to make.
B. It is very expensive to make.,
C. It produces pollution when burned.
C. It produces pollution when burned.,
D. It cannot be used to generate electricity.
Answer:
hope this is help helpful
Explanation:
natural gas are considered nonrenewable because they can not be replenished in a short period of time.
Carbon dioxide has a relatively high solubility in blood plasma, although it has a very low partial pressure. What law describes this phenomenon
Answer:
The bulk of carbon dioxide is carried chemically combined with the amino acids of hemoglobin as carbaminohemoglobin in the RBCs.
Which two correctly relate the attraction between the particles of a liquid and
the temperature at which the liquid changes state?
A. Strong attractions mean the liquid melts at a lower temperature.
B. Strong attractions mean the liquid boils at a lower temperature.
C. Strong attractions mean the liquid boils at a higher temperature.
O D. Strong attractions mean the liquid melts at a higher temperature.
Answer:
C & D
Explanation:
The attractive force between particles of a liquid determines the temperature at which the liquid changes state: the stronger the attraction, the larger amount of energy is required to break the bonds to boil; i.e. at a higher temperature. So C. Strong attractions mean the liquid boils at a higher temperature is correct.
By the same reasoning, the stronger attractive force between particles also means that it takes more energy to change state from solid to liquid; i.e. a higher melting point. So D. Strong attractions mean the liquid melts at a higher temperature is also correct.
(c) Graphite is another naturally-occurring form of carbon.
Graphite can be used in pencils because it is soft and can leave marks on paper.
Graphite can also be used as a conductor of electricity.
Explain why graphite is soft and conducts electricity.
Refer to structure and bonding in your answer.
(5)
DO NOT WRITE IN THIS AREA
Graphite is a fantastic lubricant and a powerful electrical conductor because of these unbound electrons.
What is the purpose of Unbound?Unbound can serve as a caching server, it can also perform recursion, store records obtained from other DNS servers, and provide an authoritative service, such as if you only have a few zones.
As a result, it can act as a "glue" server or host a small zone with only a few domains, making it ideal for a lab.
Why need to utilize Unbound DNS?
With its harden-glue, access control, maximum randomization for request ID and ports, response scrubbing, case preservation, plus Denial of Service or DoS prevention capabilities, Unbound is feature-rich with DNS Security. These are only a few.
Therefore, graphite is a fantastic lubricant and a powerful electrical conductor because of these unbound electrons.
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What are three reasons that using renewable energy is important.
Answer:
1. they reduce green house gases
2. they can last a long time and come back pretty much every year and some never run out
3. we have unlimited supply of most if not all renewable resources
Explanation:
hope this helps!
how many atoms are in 10.0 moles of titanium