Answer:
In one shot of expresso, there are:
4.12 x 10^-3 moles of C atoms
5.15 x 10^-3 moles of H atoms
2.06 x 10^-3 moles of N atoms
1.03 x 10^-3 moles of O atoms
The moles of carbon and hydrogen present in the caffeine in one shot of espresso are 4.11× 10⁻³moles and 5.14× 10⁻³moles respectively.
What is mole?A mole is just a measuring scale. In reality, it is one of the International System for Units' seven foundation units (SI). When already-existing units are insufficient, new ones are created. The levels at which chemical reactions frequently occur exclude the use of grams, yet utilizing actual numbers of atoms, molecules, or ions would also be unclear.
6.02 x 1023 chemistry instructors make up a mole. Anytime we want to make a reference to a lot of different things, it is much simpler to type the word "mole" rather than the number "6.02x1023." In essence, it is the reason this specific unit was created.
caffeine in a shot of espresso = 1.00 × 10² mg/1000=0.1g
mole of caffeine =0.1g÷ 194.19g/mol
=5.149× 10⁻⁴mole
moles of carbon =8×5.149× 10⁻⁴
= 4.11× 10⁻³moles
moles of carbon = 10× 5.149× 10⁻⁴
=5.14× 10⁻³moles
Therefore, the moles of carbon and hydrogen present in the caffeine in one shot of espresso are 4.11× 10⁻³moles and 5.14× 10⁻³moles respectively.
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If N and O were to bond, the difference in electronegativity would be
and we would expect the bond to be
ionic, covalent)
Answer:
The bonds between nitrogen and oxygen are covalent bonds made from sharing electron pairs. The electronegativity of oxygen is 3.5.
Which of these factors is involved in earthquake formation?
A. plates getting larger
B. rocks breaking
C. stress that decreases
D. faults that remain stationary
Answer:
B
Explanation:
Edge 2023
Which gas is given out during burning process
Answer:
Carbon dioxide
I hope it helps
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pls make me brainliest
In what situation does water undergo a physical change?
Answer:
There are actually two.
Explanation:
When water freezes it turns to ice however it still has the molecular properties of water. Same thing when it evaporates.
Ahh, help me I don’t know what to pick
Answer:
for what? is there supposed to be a picture?
Explanation:
??
collect some of chalk, limestone, marble, eggshells and seashells and mix them with a dilute acid. pass the gas produced into a small amount of limewater to test for carbon dioxide. is carbon dioxide gas produced in each case.
Explanation:
Yes carbon dioxide found in each case
How
many moles of hydrogen gas will form if 0.35 moles of Na reacts with an
excess of water?
Answer:
0.8 moles
Explanation:
2H2+O2 —›2H2O
Since , from given balanced chemical Equation.
2moles of H2 produce 2 moles of Water
So,
2moles H2= 2moles H2O
1moles H2= 1 mole of H2O
For 0.8 mole of H2O, multiply both sides by 0.8
0.8 H2=0.8 H2O
0.8 mole of H2= 0.8 mole H2O
So answer is 0.8 moles
Substances that are good conductors of heat and electricity at room temperature usually
have delocalized electrons moving freely from atom to atom. Which type of bonding
occurs in these substances?
O covalent
electric
ionic
metallic
ASAP PLEASEE
Answer:
the answer is electric
Explanation:
i think so
Please help me with this
What does 10% humidity in a weather report indicate?
A)the level of humidity is high.
B)the level of humidity is low.
C)the level of humidity is moderate.
D)the air can not hold anymore water.
Answer:
B
the humidity is the % of water in the air and it is out of 100% of the air. so 10/100 is low
Answer:
B
Explanation:
30%-50% is considered moderate. Anything below 30% is considered dry, anything above 50% is considered high. I hope this helps!
3. What might be the formula for calculating speed?
4. What might be the formula for calculating distance?
spe
5. What might be the formula for calculating time?
(m/s)
6. What might be the units for speed?
Answer:
3)The formula for speed is
speed=distance ÷ time
distance is in metres (m)
and time is in seconds (s),
so the units will be in metres per second (m/s).
4)to solve for distance use the formula for distance d = st, or distance equals speed times time. ... You can use the equivalent formula d = rt which means distance equals rate times time. distance = rate x time.
5)To solve for time use the formula for time,
t = d/s which means time equals distance divided by speed.
6)The SI unit of speed is the metre per second, but the most common unit of speed in everyday usage is the kilometre per hour.
please mark me as a brain list
how do I balance these
Describe how the calcium atom and the oxygen atop form calcium oxide
Explanation: Formula and structure: Calcium oxide chemical formula is CaO and its molar mass in 56.0774 g mol-1. The molecule is formed by the calcium cation Ca+2 and the oxygen anion O-2, which form a ionic bond. The calcium oxide ionic lattice is cubic and similar to NaCl lattice, with an ion surrounded by 6 opposite charge-ion.
Write a net ionic equation for the neutralization reaction of acid with a hydroxide base. (Include phase symbols)
Answer:
salt + water. It is called the ionic equation for neutralisation. the acid to form a salt solution.
Explanation:
So what you end up with is you always end up H+ plus OH- yields H2O, because HCl, and NaOH, since they're strong, they fully dissociate. So the Na+, and the Cl - are spectator ions. So with a strong acid and strong base, the net ion equation is always H+ plus OH- yields H2O.
What chemicals must be cycled through a Martian environment in order for the planet to be habitable for life? Describe how scientists intend to make those resources available in such a harsh environment.
Which of the following pairs of elements will form covalent bonds with each other? PLEASE HELP
The pair of elements which will form covalent bonds with each other are Si (Silicon) and N (Nitrogen). Hence the correct option is (B).
What is Covalent Bond ?
A covalent bond is a chemical bond that involves the sharing of electrons to form electron pairs between atoms.
These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.
Silicon and nitrogen forms strong covalent bond . This stable covalently bonded material does not readily sinter and cannot be heated over 1850⁰C as it dissociates into silicon and nitrogen.
Therefore, The pair of elements which will form covalent bonds with each other are Si (Silicon) and N (Nitrogen). Hence the correct option is (B).
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two difference between simple cell and dry cell
Explanation:
Simple cell has liquid chemicals and it is difficult to carry from one place to another. Dry cell has no solution. So, it is easier to carry it from one place to another and there is no risk of spilling acid from the dry cell.
it is also called solution
Explanation:
In chemistry, a solution is a special type of homogeneous mixture composed of two or more substances. In such a mixture, a solute is a substance dissolved in another substance, known as a solvent. ... The term "aqueous solution" is used when one of the solvents is water.
What is the man’s weight on Mars where the acceleration due to gravity is 3.7 m/s2?
Answer:
6.39 × 10^23 kg (0.107 M⊕)
Explanation:
PLZ HELP SCHOOL STARTS TMR AND I NEED THIS DONE BY 2NIGHT. ILL GIVE BRAINLIEST
Answer:
Filtration separates solids of different sizes.
Distillation takes advantage of differences in boiling points.
Evaporation removes a liquid from a solution to leave a solid material.
Balance the following chemical equation:
i need F
Answer:
L2 add a for NAL add a 2 then for the first NA2 put a 4 and then the second NA2 put a 2 and it should be good
Explanation:
Electrons, protons and which other sub-atomic particle were discovered in the 19th and early 20th century?
Answer: The electron, discovered in 1897 by J. J. Thomson, was the first subatomic particle to be observed. The nucleus of ordinary hydrogen was understood to be a single proton after the nucleus of the atom was discovered in 1911 by Ernest Rutherford. In 1932, a neutron was detected.
Which has a larger impact on change in atomic size: moving down one period or moving across a family
Answer:
hi this my first day, also the answer is moving one period :)
explain why it is more difficult to produce drinking water from waste water than from water in lakes
Answer:
Drinking water can be produced from waste water and from lakes but the difference is in the difficulty of producing water which we can consume.
Drinking water should be clean and toxic free so that if does not affect the human body. Waste water carry more toxic matter in comparison to lake water that's why, producing drinking water from waste water takes more time, expensive and difficult.
So, producing drinking water from waste water is more difficult as it require the removal of more toxic matter than water in lakes.
What is the slope of the line?
A property is a characteristic that can be used to identify a substance. Properties can be ______ or _______.
Answer:
a list of characteristics that can be used to identify a substance include color, odor, taste, density, melting point, boiling point, conductivity, and hardness.
Answer:
physical or chemical
Explanation:
A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance while a chemical property describes the ability of a substance to undergo a specific chemical change.
How many grams of nitric acid, HNO3, are required to neutralize (completely react with) 4.30 g of Ca(OH)2?
Answer:
8.25 g HNO3 (please correct me if I'm wrong!)
The correct answer is 7.31 g HNO₃.
What is nitric acid used for?Nitric acid is used for the production of ammonium nitrate, a major component of fertilizers. It is also used for producing explosives like nitroglycerin and trinitrotoluene (TNT) and for oxidizing metals.
Please check the attached file for an explanation.
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Explain how Newton's idea about inertia has helped in astronomy?
o We can learn that objects in space like asteroid will keep its path unless a different force is applied to it
The Law of Inertia will help us discover distant galaxies
Inertia is used to help identify distance planets.
o We can figure out the size of far away planet through the Law of Inertia.
NEXT QUESTION
ASK FOR HELP
Answer:
the answer is A because when something is going straight it wont change unless its acted upon by a force
Explanation:
10. Which is true of unicellular organisms?
A. They lack cells.
B. They all are eukaryotes.
C. They lack cell differentiation.
Answer:
a
Explanation:
Answer:
The answer is
B. They all are eukaryotes.
Hope it will help :)
What is the empirical formula of a compound that contains 28% iron, 24% sulfur, and 48% oxygen by mass?
Answer:
Fe2S3O12 would be the closest Answer
Explanation: