Answer:
Sample equal to the atomic mass of an element in grams contains 6.02214179 × 10²³ atoms. This amount of matter is called a mole
Explanation:
Experimentally, it has been determined that 1 mole of any substance contains 6.02214179 × 10²³ elementary entities. The number of elementary entities in the mole is known as Avogadro's number, [tex]N_A[/tex], or the Avogadro's constant and the unit of the constant is per mole
The molar mass of a compound or an element is the mass of 1 mole of the compound or the element given in grams
Similarly, the gram atomic mass is the mass in grams of 1 mole of the atoms of the element that contains one Avogadro's number of atoms
Therefore, we have;
The number of atoms in a sample equal to the atomic mass of an element in grams = 6.02214179 × 10²³ atoms
The name given to the amount of matter containing equivalent to 6.02214179 × 10²³ elementary particles = A mole.
is alcohol a pure substance or a mixture
A sample of nitrogen gas is collected over water at temperature of 20.0˚C. What is the pressure of the nitrogen gas if atmospheric pressure is 1.01atm? (vapor pressure of water at 20.0˚C is 17.5 torr)
Answer:
[tex]P_N=0.987atm[/tex]
Explanation:
Hello there!
In this case, for these problems about collecting a gas over water, we must keep in mind that once the gas has been collected, the total pressure of the system is given by the atmospheric pressure, in this case 1.01 atm. Next, since we also have water in the mixture, we can write the following equation:
[tex]P_T=P_w+P_N[/tex]
Thus, by solving for the pressure of nitrogen and using consistent units, we obtain:
[tex]1.01atm=17.5torr*\frac{1atm}{760torr} +P_N\\\\P_N=1.01atm-0.023atm\\\\P_N=0.987atm[/tex]
two copper pennies has a mass of 6.64g how many moles of copper do they contain
Answer:
It contains 0.105 mole cu
Explanation:
Please help me with this net ionic chem question I’ll mark you brainiest if it’s correct
Answer:
The answer is Co2+(aq) + 2 OH-(aq) -> Co(OH)2(s) so the answer is c.
Explanation:
The concentration of C6H12O6 may be represented as (C6H12O6) {C6H12O6} [C6H12O6]
Answer:
[tex][C_6H_{12}O_6][/tex]
Explanation:
Hello there!
In this case, since the concept of solution concentration is majorly used in terms of moles per liters of solution or molarity (M), it is also possible to represent this chemical unit by using squared brackets, [ ].
In such a way, when focused on the concentration of glucose, C6H12O6, we can use:
[tex][C_6H_{12}O_6][/tex]
Best regards!
Please answer the following questions....Very urgent!
How many atoms are in 9.95 moles of iron?
How many molecules are in 0.03 moles of Carbon dioxide?
How many moles are found in 7.20 x 10^23 atoms of platinum?
Answer:
59.92 × 10²³ atoms are in 9.95 moles of iron
1.8 ×10²² molecules are in 0.03 moles of Carbon dioxide
1.19 moles are found in 7.20 x 10^23 atoms of platinum
What is the general formula for alkanes?
Answer:
Alkanes have the general formula of CnH2n+2 where n is the number of carbon atoms.
3. Density is influenced by changes in
A.Temperature and salinity
B.Wind
C.Upwelling
D.Ocean currents
Please answer and thank you
Answer:
It's A.
Atoms that have the same number of valence electrons in their outer shell have similar properties and belong to the same family of elements.
2 Which two substances cause iron to rust?
Answer:
water and oxygen
Explanation:
this is because
iron + water + oxygen ----> hydrated iron (III) oxide (which is rust in lame terms )
hope this helps
please mark it brainliest
What are some of the sources of pollution in south shore, chicago, where there are primarily people of color?
Answer:
Air pollution, Water pollution, disposal of hazardous waste, exposure to lead paint and vehicle traffic
Explanation:
On the west and South side of Chicago, the minority neighborhoods are affected by the exposure to toxic air pollution and other environmental health hazards such as Water pollution, disposal of hazardous waste, exposure to lead paint and vehicle traffic.
How to find the number of protons in an element?
Answer:
Locate the element’s atomic number. The atomic number is located above the element symbol, in the upper left-hand corner of the square. The atomic number will tell you how many protons make up a single atom of an element.
Explanation:
Answer:
To calculate the numbers of subatomic particles in an atom, use its atomic number and mass number: number of protons = atomic number. number of electrons = atomic number. number of neutrons = mass number - atomic number.
Explanation:
i hope it helps and have a great day
3 If methane burns in a poor supply of air it will give carbon
monoxide and water instead. See if you can write a balanced equation to show this.
Answer:
2CH4 + 3O2 → 2CO + 4H2O
Explanation:
When methane is burnt in adequate supply of oxygen, then carbon dioxide is produced but when methane is burnt in limited supply of oxygen, then carbon mono-oxide is produced.
The balanced equation for the same is as follows -
2CH4 + 3O2 → 2CO + 4H2O
Please help me with this net ionic chem question. I’ll mark you brainiest if you know it.
Answer:
B: 3k+ + 3OH¯ + Fe3+ + 3KOH = Fe3(H) + + 3NO3¯
Explanation:
Potassium hydroxide (KOH) reacts with iron (III).
The normal balanced equation is;
Fe(NO3)3 + 3KOH = Fe(OH)3 + 3KNO3
Now the ionic equation will be;
3k+ + 3OH¯ + Fe3+ + 3KOH = Fe3(H) + + 3NO3¯
Which picture accurately depicts the position of the earth, moon, and sun during a spring tide?
Answer:
it would be D or the forth one
Explanation:
HELP ME PLS HELP ME PLS HELP ME PLS HELP ME PLS HELP ME PLS HELP ME PLS HELP ME PLS HELP ME PLS HELP ME PLS HELP ME PLS HELP ME PLS HELP ME PLS HELP ME PLS HELP ME PLSHELP ME PLS
Answer:
A
Explanation:
Answer:
A! have a wonderful day!
Explanation:
If the man and the ball travels 90 m in 15 seconds, what is their average
speed?
Answer:
The average speed should be 6mps (6 meter per second)
Explanation:
90 divided by 15 = 6
Body systems are groups of organs that work together to perform a specific function for the organism. Which body system is responsible for eliminating unused by-products excreted from cells and helping balance chemical and water concentrations within the body?
Answer:
It is Excretory system.
:)
How many grams of KNO3 would recrystallize from 100 g of water, if a saturated solution were cooled from 50 degrees celcius to 20 degrees celcius?
Answer:
[tex]m_{cryst}=58g[/tex]
Explanation:
Hello there!
In this case, according to the attached solubility chart, it is possible for us to realize that about 88 grams of KNO3 are soluble at 50 °C but just 30 grams are soluble at 20 °C in the same 100 g of water.
In such a way, the crystalized mass of this solute can be calculated by subtracting the mass at 50 °C and the mass at 20 °C:
[tex]m_{cryst}=88g-30g\\\\m_{cryst}=58g[/tex]
Best regards!
I need help I need the answer ASAP.
7. Marcie fills a graduated cylinder with 15.0mL of water. Paul finds the mass of a marble to be
2.21g, then drops the marble into the graduated cylinder. If the meniscus on the cylinder is
now at 16.3mL, what is the density of the marble?
Answer:
1.7 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
volume = final volume of water - initial volume of water
volume = 16.3 - 15 = 1.3 mL
We have
[tex]density = \frac{2.21}{1.3} = 1.7 \\ [/tex]
We have the final answer as
1.7 g/mLHope this helps you
which statement is true about tomato juice?
Answer:
The correct answer is Option A. Explanation: Tomato is a citrus fruit which contains citric acid as a main chemical component. This range lies in the range of acidic substances.
nickel (iii) cyanide + aluminum permanganate product?
Answer:
Nickel(II) cyanide is an inorganic compound with a chemical formula Ni(CN)₂
Explanation:
Hope it helps u
FOLLOW MY ACCOUNT PLS PLS
Calculate the area of an applied force of 300 N and a pressure of 35 Pa? (the answer needs to be accurate with 2 decimal places!)
Answer:
Explanation: 1Pa 1 N/m^2. p = F/A and A = F/p = 300N /35 Pa = 8.57 m^2
Which example describes biotic factors interacting with the environment?
sunlight shining through a window
O oxygen circulating in the atmosphere
O rain forming puddles on the sidewalk
O butterflies resting on the flower of a plant
Answer:
O butterflies resting on the flower of a plant
Answer:
The answer is butterflies resting on the flower of a plant.
Explanation:
How many liters of water do we need to add to 5.00 moles to get a 0.648 M solution?
Answer: This is a typical acid/base equilibrium problem, that involves the use of logarithms.
Explanation:We assume that both nitric acid and hydrochloric acid dissociate to give stoichiometric
H
3
O
+
.
Moles of nitric acid:
26.0
×
10
−
3
⋅
L
×
8.00
⋅
m
o
l
⋅
L
−
1
=
0.208
⋅
m
o
l
H
N
O
3
(
a
q
)
.
And, moles of hydrochloric acid:
88.0
×
10
−
3
⋅
L
×
5.00
⋅
m
o
l
⋅
L
−
1
=
0.440
⋅
m
o
l
H
C
l
(
a
q
)
.
This molar quantity is diluted to
1.00
L
. Concentration in moles/Litre =
(
0.208
+
0.440
)
⋅
m
o
l
1
L
=
0.648
⋅
m
o
l
⋅
L
−
1
.
Now we know that water undergoes autoprotolysis:
H
2
O
(
l
)
⇌
H
+
+
O
H
−
. This is another equilibrium reaction, and the ion product
[
H
+
]
[
O
H
−
]
=
K
w
. This constant,
K
w
=
10
−
14
at
298
K
.
So
[
H
+
]
=
0.648
⋅
m
o
l
⋅
L
−
1
;
[
O
H
−
]
=
K
w
[
H
+
]
=
10
−
14
0.648
=
?
?
p
H
=
−
log
10
[
H
+
]
=
−
log
10
(
0.648
)
=
?
?
Alternatively, we know further that
p
H
+
p
O
H
=
14
. Once you have
p
H
,
p
O
H
is easy to find. Take the antilogarithm of this to get
[
O
H
−
]
.
Answer link
Which statement BEST describes what happens when a cold front approaches a warm front?
The cold air mass will push the warm air mass upwards.
The cold air mass will slide over top of the warm air mass.
The cold air mass will retreat from the warm air mass.
Cold fronts have no affect on warm fronts when they come together.
Answer:
A
Explanation:
In a cold front set-up, the boundary between the cold and warm air masses is relatively steep, typically causing the warm air in front of it to rise rapidly.
A cold front has been the transition zone that includes the replacement into the warmer zones. The cold air mass will be settled at the bottom and pushes the warm air to rise. Thus, option A is correct.
What is the cold and warm front?A cold front is said to be the bad weather conditions that are has been constituted by the cooler air mass. It is cold and dry air that moves from the "northwest to the southeast" direction. In an occluded front, the cold front meets the warm front.
When the cold air front meets the warm air front then, the cold air being denser settles at the bottom and results in pushing the warm air front in an upwards direction. The warm front has less dense air that rises in an upward direction.
Therefore, option A. the cold front moves the warm front in the upper direction.
Learn more about the cold and warm front, here:
https://brainly.com/question/20039087
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Using the balanced reaction 2Al2O3 → 4Al + 3O2 determine the moles of Aluminum Oxide, Al2O3 produced when 85.5 grams of Aluminum Al is produced.
molar masses: Al2O3 = 85.962 O2= 31.998 Al = 26.982
A 1.58 mol
B 8.95 mol
C 6.34 mol
D 1.67 mol
Answer:
The correct option is option;
A. 1.58 mol
Explanation:
The given balanced chemical reaction is presented as follows;
2Al₂O₃ → 4Al + 3O₂
The given mass of Al produced = 85.5 grams
The given molar mass of Al₂O₃ = 85.962 g/mol
The given molar mass of O₂ = 31.998 g/mol
The given molar mass of Al = 26.982 g/mol
[tex]We \ note \ that \ the \ number \ of \ moles, \ n = \dfrac{Mass }{Molar \ mass}[/tex]
For the given produced Al, n = 85.5 g/(26.982 g/mol) ≈ 3.169 moles
From the given reaction, we have;
2 moles of Al₂O₃ produces 4 moles of Al
∴ 2/4 moles of Al₂O₃ produces 4/4 = 1 mole of Al
2/4 × 3.169 = 1.5845 moles of Al₂O₃ produces 1 × 3.169 = 3.169 moles of Al
∴ 1.5845 ≈ 1.58 moles of Al₂O₃ produces 3.169 moles of Al ≡ 85.5 grams of Al
The correct option is approximately 1.58 moles of Al₂O₃.
Explain the difference between a covalent bond formed between two atoms of the same element and a covalent bond between two atoms of two different elements.
Answer:
Polarity
Explanation:
Covalent bonds between two atoms of the same element (diatomics) are nonpolar because neither atom is more electronegative. Covalent bonds between atoms of two different elements are often polar and must be polar to some extent because of differences in electronegativity between the two atoms involved.
Can someone help me with D
Answer: No
Explanation:
Epsom salts have different solubility in water compared to sugar.