Answer:
208.8018 g/Mol you conver the answer by weight and moles
if there are 0.0023 moles of water in a sample, how many molecules are there?
39 g H
2
O
contains
1.3
×
10
24
molecules H
2
O
.
Explanation:
One mole of water has a molar mass of
18.015 g/mol
and
6.022
×
10
23
molecules H
2
O
. Therefore,
1 mol H
2
O
=
18.015 g H
2
O
=
6.022
×
10
23
molecules H
2
1O
Multiply the given mass of water times the conversion factors that cancel grams and moles of water, leaving molecules of water, as demonstrated below.
39
g H
2
O
×
1
mol H
2
O
18.015
g H
2
O
×
6.022
×
10
23
molecules H
2
O
1
mol H
2
O
=
1.3
×
10
24
molecules H
2
O
39 g H
2
O
contains
1.3
×
10
24
molecules H
2
O
.
Explanation:
One mole of water has a molar mass of
18.015 g/mol
and
6.022
×
10
23
molecules H
2
O
. Therefore,
1 mol H
2
O
=
18.015 g H
2
O
=
6.022
×
10
23
molecules H
2
1O
Multiply the given mass of water times the conversion factors that cancel grams and moles of water, leaving molecules of water, as demonstrated below.
39
g H
2
O
×
1
mol H
2
O
18.015
g H
2
O
×
6.022
×
10
23
molecules H
2
O
1
mol H
2
O
=
1.3
×
10
24
molecules H
2
O
39 g H
2
O
contains
1.3
×
10
24
molecules H
2
O
.
Explanation:
One mole of water has a molar mass of
18.015 g/mol
and
6.022
×
10
23
molecules H
2
O
. Therefore,
1 mol H
2
O
=
18.015 g H
2
O
=
6.022
×
10
23
molecules H
2
1O
Multiply the given mass of water times the conversion factors that cancel grams and moles of water, leaving molecules of water, as demonstrated below.
39
g H
2
O
×
1
mol H
2
O
18.015
g H
2
O
×
6.022
×
10
23
molecules H
2
O
1
mol H
2
O
=
1.3
×
10
24
molecules H
2
O
Hello people ~
Ignition temperature is the lowest temperature at which a substance catches fire. Identify the correct option regarding the ignition temperature of a good fuel.
A. Ignition temperature below room temperature
B. Ignition temperature above room temperature
C. Ignition temperature equal to 100∘C
D. Ignition temperature equal to room temperature
B is your answer
If the ignition temperature of a fuel is lower than the room temperature, then it can catch fire very easily.
Therefore for an ideal fuel, the ignition temperature should be higher than the room temperature.
let's observe one by one
#1
If ignition temperature is below room temperature the fuel can catch fire at once.
No#2
Ignition temperature above room temperature is applicable as the fuel won't catch fire easily
True#3
It's boiling point of water not fuels
False#4
Equal to room temperature is same as first one can cause damage
NoGiven the reaction: 2Na + 2H2O --> 2NaOH + H2 How many moles of Na are needed to produce exactly 5.6 liters of H2, measured at STP?
For a reaction 2Na + 2H2O --> 2NaOH + H2, The moles of Na needed to produce exactly 5.6 liters of H2 is mathematically given as
moles of H2=0.125mole
How many moles of Na are needed to produce exactly 5.6 liters of H2,?
Generally, the equation for the Chemical Reaction is mathematically given as
2Na + 2H2O -> 2NaOH + H2(g)
Therefore, since 2Na gives 1H2
PV=nRT
Hence
n=PV/RT
n=1*5.6/0.0821 *273
n=0.249mols
In conclusion,The moles is
2Na=1H2
moles of H2=0.125mole
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What units are appropriate to express specific heat?.
Answer:
joules per gram per degree (J/goC) or calories per gram per degree (cal/goC).
Explanation:
Answer:
Joules, Kelvin, or calories
Explanation:
the [-oh) in a sample of egg whites is 6.3 x 10-7 m. what is the [h3o+] in these
egg whites?
The hydrogen ion concentration [H3O+] in an egg white containing 6.3 × 10-⁷M of [OH-] is 1.5 × 10-⁸M.
How to calculate [H3O+]?The hydrogen ion concentration of a solution can be calculated as follows:
pOH = - log [OH-]
pOH = - log [6.3 × 10-⁷M]
pOH = - [-6.2]
pOH = 6.2
Since pOH + pH = 14
pH = 14 - 6.2
pH = 7.8
pH = - log [H3O+]
7.8 = - log [H3O+]
[H3O+] = 10-⁷:⁸
[H3O+] = 1.5 × 10-⁸M
Therefore, the hydrogen ion concentration [H3O+] in an egg white containing 6.3 × 10-⁷M of [OH-] is 1.5 × 10-⁸M.
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hello people ~
Identify the type of plastic that can best be used to make electrical switches.
A. PVC
B. Polythene
C. PET
D. Bakelite
Answer:
Bakelite
Explanation:
Bakelite is a non recyclable plasticSimilar to Melamine it has some of very bad heat and electricity conducter.So it's used in electrical switchesWhich of the following shows the proper configuration for the straight chain isomer of butane?
Answer:
option C is the correct answer
Explanation:
it belongs to alkanes series
for alkane series the formula is
C n H 2n+2
so the formula of b utane is
C 4 H 10
The correct answer is option C.C4H10
What is straight chain isomerism?
These isomers occur because they can branch off at the carbon chain. For example, butane has two isomers, C4H10. One of them has a "linear" carbon atom and the other has a branched chain.
Butane is a 4-carbon alkane, so its molecular formula is C4H10. There are two isomers. n-Butane and isobutane. Here, n-butane is a linear compound with four carbon atoms connected by a single covalent bond.
\Compounds with the same molecular formula but different arrangements of carbon atoms in the straight or branched chain are called chain isomers. n-Butane and isobutane are chain isomers because they have different carbon atom arrangements
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#SPJ2.
During an experiment, ice and water were placed in a perfectly insulated thermos flask at 0 °C. Describe this system when it phase reaches equilibrium. (8 points)
Answer :By the time thermal equilibrium is attained in the system, ice is completely converted to water.
What is tehrmal equilibrium?
Thermal equilibrium is a situation in which two substances are exactly at the same temperature. That is. Heat is no longer flowing beween the bodies.
Recall that an insulated thermos flask implies that heat does not eneter or leave the system. Heat will flow from the water to the ice untill the both attains the same temperature and the ice is completely converted to water.
Have a good day
60 points! please help me! i will appreciate it
Answer:
[tex]\huge\boxed{\sf v = 0.017 \ L}[/tex]
Explanation:
Given Data:
Mass = m = 0.08 g
Molar mass of C₂H₂F₄ = (12×2) + (1×2) + (19×4)
= 24 + 2 + 76 = 102 g/mol
Pressure = P = 1.14 atm
Temperature = T = 19.1 °C + 273 = 292.1 K
Gas Constant = R = 0.08206 L atm K⁻¹ mol⁻¹
Required:
Volume = v = ?
Formula:
Pv = nRT
Solution:
Firstly, finding moles (n)
[tex]\displaystyle n = \frac{mass}{molar \ mass} \\\\n = \frac{0.08 }{102} \\\\n =0.0008 \ mol[/tex]
Now, Finding volume (v)
Rearranging formula
[tex]\displaystyle v = \frac{nRT}{P} \\\\v = \frac{(0.0008)(0.08206)(292.1)}{1.14} \\\\v = \frac{0.019}{1.14} \\\\v = 0.017 \ L\\\\\rule[225]{225}{2}[/tex]
Methane from ohio's rose valley coal mine has successfully been used to power fuel cells. since the fuel used in these cells is not burned, using methane from this mine will help to
a.increase public awareness of global warming issues
b.increase the concentration of atmospheric ozone
c.reduce public demand for alternative fuel souces
d.reduce pollutants commonly associated with fossil fuel combustion
Methane in fuel cells are not burned and therefore, help to reduce pollutants commonly associated with fossil fuel combustion.
What are fossil fuels?Fossils fuels are fuels wgich are produced from fossils which have decomposed under intense heat and pressure over a long period of time.
Fossils fuels include:
methanepetrolkerosenediesel oilcoalFossils fuels combustion release pollutants into the atmosphere and have greatly contributed to global warming.
Since methane in fuel cells are not burned, it will help to reduce pollutants commonly associated with fossil fuel combustion.
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How would you describe the temperature of an object that has very slow moving particles?
Which plants have a fibrous root system? (Select all that apply.) grass dandelion carrot corn
The plants which have a fibrous root system are
GrassCornWhat is a fibrous root?A fibrous root system is a root system which consists of large mass of roots of nearly equal size
Some few examples of plants with fibrous roots system are as follows:
Rice plantsSugarcane plantsOnionsPinesAsparagusMaizeIn conclusion; the plants which have a fibrous root system are grasses and corns.
Learn more about fibrous root system:
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What does an electromagnetic spectrum refer to?
What type of material does not allow electrons to flow easily?
neutral particles since they do not posses any charge
i need help from the problem below
Answer:
I won't say I'm confident with this because I'm not sure if the second one is even correct, but I hope I helped you and didn't make things worse lol.
What is density? (1 point) the amount of space occupied by a substance or body O the quantity of matter contained in a substance or body o the amount of heat contained in a body o the degree of compactness of a substance
Answer:
density answer IS ....
How much hcl must be added to a liter of buffer that is 1. 5 m in acetic acid and 0. 70 m in sodium acetate to result in a buffer ph of 4. 01?]
For a liter of a buffer that is 1. 5 m in acetic acid and 0. 70 m in sodium acetate, and with a result in a buffer pH of 4.01, the moles of HCl required is mathematically given as x=0.313mol
What is the result in a buffer ph of 4. 01?Generally, the equation for the pH is mathematically given as
pH=pKa+logsalt/acid
Generally, the equation for the Chemical Reaction is mathematically given as
HCl+CH3CooNa---->NaCl+CH3OOH
Therefore
4.01=4.74+log\frac{0.8-x}{1.3+x}
-0.52=log\frac{0.8-x}{1.3+x}
x=0.313mol
In conclusion, The moles of HCl required is
x=0.313mol
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Buffer is a solution that prevents pH variation in a solution when base or acid is added. In a liter of buffer 0.313 mol of hydrochloric acid must be added.
What is pH?pH is the potential of hydrogen and is given as,
[tex]\rm pH =\rm pKa + log \dfrac{salt}{acid}[/tex]
The chemical reaction is given as,
[tex]\rm HCl+CH_{3}COONa \rightarrow NaCl+CH_{3}OOH[/tex]
Given,
pH =4.01
pKa = 4.74
Concentration of salt = 0.8 - x
Concentration of acid = 1.3 + x
Substituting values in the pH formula:
[tex]\begin{aligned} 4.01 &= 4.74 + \rm log \dfrac{(0.8 - x)}{ (1.3 + x)}\\\\-0.52 &= \rm log \dfrac{(0.8 - x)}{ (1.3 + x)}\\\\&= 0.313 \;\rm mol\end{aligned}[/tex]
Therefore, 0.313 moles of HCl are needed.
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I have my last 3 electrons on the third energy level.
Answer:
an energy level represents the three dimensional space surrounding nucleus where electrons are most likely to be.
Explanation:
Hello people ~
Friction always
(a) opposes the motion
(b) helps the motion
(c) both (a) and (b)
(d) none of these
Answer:
Opposes the motion
Explanation:
Let's take an example
Suppose you kicked a ball and the ball is doing down the groundThe friction makes the ball to stop after sometime .So it opposed the ball's motionoption A is correct
What is the energy required to remove the electron from a hydrogen atom in the n = 11 state?
Based on the data given, the energy required to remove an electron from a hydrogen atom in the n = 11 state is -0.112 eV
What is ionization energy?Ionization energy is the energy requiredto remove an electron from a neutral atom or a cation in its gaseous state.
To calculate the energy required to remove the electron from a hydrogen atom in the n = 11 state, the formula below is used:
[tex]E_n = \frac{E_0 × Z^{2}}{n^{2}}[/tex]where
[tex]E_0 \: is \: ground \: state \: energy \: of \: hydrogen \: atom \: = -13.6 eV \\ [/tex]
Z = 1n = 11substituting the values:
[tex]E_n = \frac{ - 13.6 × 1^{2}}{11^{2}} \: = - 0.112 \: eV[/tex]
Therefore, the energy required to remove an electron from a hydrogen atom in the n = 11 state is -0.112 eV
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find the oxidation state of c in (NH4)2 CO3
Answer:
Ammonium carbonate is a neutral molecule. Charge on NH4 is +1 , so on (NH4)2 is +2 ( +1 * 2) ,lets take the charge on C to be x and O is -2 , so on O3 is -6 (3*-2). Therefore x= + 4. Hope it helps.
Explanation:
Distinguish between the law of conservation of mass and the law of constant proportion
A gas has a mass of 3.82 g and occupies a volume of 0.854 L. The temperature in the laboratory is 302 K, and the air pressure is 1.04 atm. calculate the molar mass of the gas.
1) 93.4 g/ mol
2) 72.3 g/ mol
3) 107 g/ mol
4) 35.8 g/mol
The molar mass of the gas that has a mass of 3.82 g and occupies a volume of 0.854 L is 106.66g/mol.
How to calculate molar mass?The molar mass of a substance can be calculated by dividing the mass of the substance by its number of moles.
However, the number of moles of the gas in this question needs to be calculated first using the ideal gas law equation:
PV = nRT
Where;
P = pressureV = volumen = number of molesT = temperatureR = gas law constant1.04 × 0.854 = n × 0.0821 × 302
0.888 = 24.79n
n = 0.888/24.79
n = 0.036mol
Molar mass of gas = 3.82g/0.036mol
Molar mass = 106.66g/mol
Therefore, the molar mass of the gas that has a mass of 3.82 g and occupies a volume of 0.854 L is 106.66g/mol.
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In healthcare settings where sterilization is an absolute necessity, what method of sterilization will typically be used?
pasteurizing
disinfecting
autoclaving
boiling
lyophilizing
Answer:
Disinfecting (or boiling)
Explanation:
They'd want to disinfect everything so that it is germless. Boiling is a possible answer as well because you can boil certain things to rid them of germs.
what causes the outer layer of star to expand?
Answer/Explanation:
Stars spend the majority of their lifespan medling hydrogen nuclei together to form helium. When the hydrogen that in the core of the star begins to run out, the star will start using hydrogen away from its core and this is what causes the star's outer layer to expand and slowly cool down.
I hope this helps!
-No one
Do you think that parents should be able to design their babies using gene technology such as CRISPR?
Make sure you have 4 or 5 sentences for your answer.
Answer:
When Chinese researchers first edited the genes of a human embryo in a lab dish in 2015, it sparked global outcry and pleas from scientists not to make a baby using the technology, at least for the present.
When Chinese researchers first edited the genes of a human embryo in a lab dish in 2015, it sparked global outcry and pleas from scientists not to make a baby using the technology, at least for the present.It was the invention of a powerful gene-editing tool, CRISPR, which is cheap and easy to deploy, that made the birth of humans genetically modified in an in vitro fertilization (IVF) center a theoretical possibility
Explanation:
Now, it appears it may already be happening.
According to Chinese medical documents posted online this month (here and here), a team at the Southern University of Science and Technology, in Shenzhen, has been recruiting couples in an effort to create the first gene-edited babies. They planned to eliminate a gene called CCR5 in hopes of rendering the offspring resistant to HIV, smallpox, and cholera.
Suggest the pH of the solution made when potassium oxide dissolves in water.
It gets basic
ie ph>7 for basic solutions
Determine the product(s) formed when cyclohexene is treated with the following reagents
Explanation:
Big C carbon surrounded by He helium
If a buffer is composed of 33. 80 ml of 0. 164 m acetic acid and 31. 63 ml of 0. 189 m sodium acetate, how many ml of 0. 100 m hcl can be added before the buffer capacity is reached?
For a buffer is composed of 33. 80 ml of 0. 164 m acetic acid and 31. 63 ml of 0. 189 m sodium acetate,The volume of HCl is mathematically given as
v1=70.1148mL
What volume of HCL can be added before the buffer capacity is reached?Generally, the equation for the Chemical reaction is mathematically given as
HCl+CH3Coo-Na---->CH3CooH+NaCl
Therefore
Mole of HCl=34.37*0.204*10^-3
Mole of HCl=7.011*10^-{-3}
In conclusion
M1v1=m2v2
Therefore
[tex]v1=\frac{m2v2}{m1}\\\\v1=\frac{7.011*10^-{-3}}{0.1}[/tex]
v1=70.1148mL
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70.114 ml of 0. 100 m HCl can be added before the buffer capacity is reached
What is volume?Volume is the space occupied by a three-dimensional object.
The chemical reaction is
[tex]\rm HCl+CH_3Coo-Na---- > CH_3CooH+NaCl[/tex]
step1, calculate the moles of HCl
[tex]34.37 \times0.204\times 10^-3[/tex]
[tex]\rm Moles\; of\; HCL \;7.011\times 10^{-3}[/tex]
The given Volume 1 is 33.80 ml
The given volume 2 is 31.63 ml
By the formula, [tex]M_1V_1=M_2V_2[/tex]
Putting the values in the equation
[tex]0.164 \times 33.80 = 100 \times V_2\\\\V_2 = 70.114 ml.[/tex]
Thus, the final volume is 70.114 ml.
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v1=70.1148mL
2) Usually, when the particle size is decreased, what will happen to the rate of dissoving?
A) It will stop.
B) It will increase.
C) It will decrease.
D) It will remain constant.