Answer:
0.01 moles
Explanation:
14 g contains 1 mole
0.14g contains> (0.14*1)/14
= 0.01 moles
Which form of decay produces a nucleus similar to the element helium?
The answer Is Alpha particle
Explanation:
:D
PLEASE ANSWER ASAP 30 POINTS!!!
In the reaction H−H → H + H, what describes an average energy change of 436 kJ/mol?
A. The energy change will be positive as bonds are being broken.
B. The energy change will be positive as bonds are being formed.
C. The energy change will be negative as bonds are being broken.
D. The energy change will be negative as bonds are being formed.
Answer:
A. The energy change will be positive as bonds are being broken.
Explanation:
The breaking of a bond is an endothermic process. An endothermic process is one in which energy must be absorbed in order for the process to take place.
In breaking a chemical bond,energy is absorbed as the bonding species are being separated from each other.
Hence, the energy change of this process shown will be positive as bonds are being broken.
Hello, anyone? help me
How many electrons did chlorine gain to become an atom with -1 charge ?
Answer:
17 electrons. On the right, the chloride ion has 18 electrons and has a 1− charge.
Explanation:
H=1.01
What is the molality of a solution containing 75.3 grams of KCI
dissolved in 100.0 grams of water?
K= 39
Cl = 35.45
Answer:
Molality of solution=10.11 m
Explanation:
We are given that
Given mass of KCl(WB)=75.3 g
Given mass of water (WA)=100 g=100/1000=0.1 kg
1 kg=1000 g
Molar mass of H=1.01 g
Molar mass of K=39g
Molar mass of Cl=35.45 g
We have to find the molality of a solution.
Molar mass of KCl(MB)=39+35.45
Molar mass of KCl(MB) =74.45 g
Number of moles of solute (KCl)=[tex]\frac{given\;mass}{molar\;mass}=\frac{W_B}{M_B}[/tex]
Number of moles of solute (KCl)=[tex]\frac{75.3}{74.45}[/tex]
Number of moles of solute (KCl)=1.011 moles
Molality of solution
=[tex]\frac{number\;of\;moles\;of\;solute}{mass\;of\;solvent}[/tex]
Using the formula
Molality of solution=[tex]\frac{1.011}{0.1}[/tex]
Molality of solution=10.11 m
The solubility of a gas is 2.0 g/L at 50.0 kPa of pres-
sure. How much gas will dissolve in 1 L at a pressure
of 10.0 kPa?
our of
Answer:
That means, under 10.0kPa of pressure, 0.4g of gas can be dissolved in 1L
Explanation:
Based on Henry's law, the solubility of the gas is directly proportional to the pressure. The equation is:
P1S2 = P2S1
Where P is pressure and S solubility of 1, initial state and 2, final state of the gas.
Replacing:
P1 = 50.0kPa
S1 = 2.0g/L
P2 = 10.0kPa
S2 = ??
50.0kPa*S2 = 10.0kPa*2.0g/L
S2 = 0.4g/L
That means, under 10.0kPa of pressure, 0.4g of gas can be dissolved in 1L
Answer: 0.4 g/L
Explanation:
S2 = S1 x P2 / P1
S2= 2 g/L x 10 kPa / 50 kPa
CROSS OUT
S2= 2g/L x 10 / 50
S2= 20 g/L/50
S2= .4 g/L
How much of a 0.74mg sample of uranium-235 will remain after 2.8x10^9
What is the Molarity of a solution made by taking 2.5 moles and dissolving it into enough water to make 5.0 Liters of solution?
Answer:
.5 M
Explanation:
molarity = moles / liters
2.5/5 = .5 M
PLEASE PLEASE HELP CHEMISTRY
Sulfur (2.56 grams) was burned in a calorimeter with excess 02(g) . The temperature increased from 21.25C to 26.72C. The bomb had a heat capacity of 923 J/C, and the calorimeter contained 815 grams of water
Calculate the heat evolved as the sulfur burned:
Calculate the heat per mole of SO2 formed in the course of the reaction
S(s) + O2 (g) SO2 (g)
what is chemical bonding?and types of chemical bonding there are?
Answer:
There are three primary types of bonding: ionic, covalent, and metallic. Ionic bonding. Definition: An ionic bond is formed when valence electrons are transferred from one atom to the other to complete the outer electron shell. Example: A typical ionically bonded material is NaCl (Salt).Explanation:
Hope it helps
#CarryOnLearning
you can test carbon dioxide gas with
Answer:
you can test carbon dioxide gas with calcium hydroxide
hope this is what you're looking for
stay safe and have a nice day
✌◕ ◡ ◕✌
The 500 cubic centimeter of 0.250 M Na2SO4 solution,
added to an aqueous solution of 15.00 grams of barium
chloride, resulted in the formation of a white precipitate of
barium sulfate. How many moles and how many grams of
barium sulfate are formed, respectively?
Answer:
0.072 moles, 16.776g.
Explanation:
The reaction of Na2SO4 and BaCl2 occurs as follows:
Na2SO4(aq) + BaCl2(aq) → BaSO4(s) + 2NaCl(aq)
To solve this question we must find the moles of each reactant. As the reaction is 1:1, the reactant with the low number of moles is limiting reactant. The moles of limiting reactant = Moles BaSO4. The mass can be obtained with the molar mass of BaSO4 -233.38g/mol-
Moles Na2SO4:
500cm³ = 0.500L * (0.250mol / L) = 0.125 moles
Moles BaCl2 -Molar mass: 208.23g/mol-
15.00g * (1mol / 208.23g) = 0.072 moles
The moles of BaSO4 are 0.072 moles and its mass is:
0.072 moles * (233.38g / mol) = 16.8g ≈ 16.776g
which of the following would not form a covalent bond
Hydrogen and oxygen
Gallium and Iodine
Nitrogen and Oxygen
Carbon and Chlorine
Answer:
Gallium
Iodine
Chlorine
40.0g of ethanol, C2H5OH, is dissolved in 150.0L of solution. Determine the molarity of ethanol in this solution.
Answer:
The molarity of ethanol is 5.8*10⁻³ M.
Explanation:
Molar concentration is a measure of the concentration of a solute in a solution, be it some molecular, ionic or atomic species.
Molarity or Molar Concentration is the number of moles of solute that are dissolved in a certain volume. It is calculated by dividing the moles of the solute by the volume of the solution:
[tex]Molarity=\frac{number of moles of solute}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
Being the molar mass of ethanol 46 [tex]\frac{g}{mol}[/tex], then the number of moles that 40 grams of ethanol contain is calculated by:
[tex]40 grams*\frac{1 mol}{46 grams} =0.87 moles[/tex]
So, being:
number of moles of solute= 0.87 molesvolume 150 LReplacing in the definition of molarity:
[tex]Molarity=\frac{0.87 moles}{150 L}[/tex]
Solving:
Molarity= 5.8*10⁻³ M
The molarity of ethanol is 5.8*10⁻³ M.
Mole ratios used for conversions come from?
Which of the following examples best represents heat?
1. A sample of platinum is 76°C.
2. A piece of plastic contains 57 J of energy.
3. A piece of wood burns at 350°C.
4. A toy car generates 45 J of kinetic energy.
Answer:
What I think it is it's.. 3?
in tsotsi who is petah
Answer: Petah is the leader of the gang. They take him in, feed him, and allow him to sleep in the pipes by the river ith them. As he learns to fend for himself he leaves the pain of the past behind even ridding himself of his forer name, deeming himself Tsotsi-gangster.
Explanation:
Which equation represents conservation of charge?
1. I- + 2e- → I2
2. 2I- → I2 + 2e-
3. Br2 → 2Br- + 2e-
4. Br + 2e- → Br-
*Pls explain your answer
Answer:
The answer for this question is the second one
The equation 2I⁻→ I₂ + 2e⁻ represents conservation of charge , Option 2 is the correct answer.
What is the equation for conservation of charge ?The law of conservation of charge states that the Electric energy cannot be created and cannot be destroyed.
The equation in the option 2 represents the conservation of charge as the 2 electrons that re present on the reactant side as negative charge is balanced by the 2 electron in the product side.
Therefore the equation 2I⁻→ I₂ + 2e⁻ represents conservation of charge , Option 2 is the correct answer.
To know more about Conservation of Charge
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What is the molarity of a solution containing 9.0 moles of solute in 462 mL of solution
Answer:
[tex]\boxed {\boxed {\sf 19 \ M}}[/tex]
Explanation:
Molarity is a measure of concentration in moles per liter, so the formula is:
[tex]molarity= \frac{moles \ of \ solute}{liters \ of \ solution}}[/tex]
This solution has 9.0 moles of solute and 462 milliliters of solution. We must convert milliliters to liters. Remember that 1 liter contains 1000 milliliters.
Create a ratio.
[tex]\frac{ 1 \ L}{ 1000 \ mL}[/tex]Multiply by the value we are converting: 462 milliliters
[tex]462 \ mL *\frac{ 1 \ L}{ 1000 \ mL}[/tex][tex]462 *\frac{ 1 \ L}{ 1000}[/tex][tex]0.462 \ L[/tex]
Now we know both values and we can solve for the molarity.
moles of solute= 9.0 moles liters of solution = 0.462 L[tex]molarity= \frac{9.0 \ mol}{ 0.462 \ L}[/tex]
Divide.
[tex]molarity= 19.4805195 \ mol/L[/tex]
The original measurements of moles and milliliters have 2 and 3 significant figures respectively. We have to round our answer to the least number of sig figs, which is 2 in this case.
For the number we found, that is the ones place. The 4 in the tenths place (19.4805195) tells us to leave the 9 in the ones place.
[tex]molarity= 19 \ mol/L[/tex]
1 mole per liter is equal to 1 molar or M, so our answer is equal to 19 M.
[tex]molarity \approx 19 \ M[/tex]
The molarity of the solution is approximately 19 M.
What is the pH of a solution with an [H+] of 9.34 x 10-6
Answer:
5.03Explanation:
The pH of a solution can be found by using the formula
[tex]pH = - log [ {H}^{+} ][/tex]
From the question we have
[tex]ph = - log(9.34 \times {10}^{ - 6} ) \\ = 5.0296...[/tex]
We have the final answer as
5.03Hope this helps you
Help needed ASAP, I will mark your answer as brainliest.
Answer:
b
Explanation:
b
Help help help I will give brainliest
Answer:
BUTANE
Explanation:
H3C--CH2--CH2--CH3
HERE, 4 CARBON AND SINGLE BOND SO, BUTANE
Answer:
D.BUTANE
Explanation:
THIS IS MY ANSWER OK
The raw materials used in making nylon?
[Please answer this]
Answer:
petroleum,natural gas,lime stone, coal,water,acetylene etc.
Answer:
petroleum,natural gas,lime stone,coal
water,acetylene
PLEASE HELP!! THANK YOU SO MUCH
true or false?
nuclear fusion is the process used in modern nuclear reactors to generate heat energy
Answer:
the answer is false(that it is not true)
El petróleo crudo, es decir, en estado natural,
se encuentra embebido en las rocas porosas de
la corteza terrestre, semejante al agua en una
esponja, y no a manera de lagos subterráneos,
como se cree. Por lo general, el pozo petrolero
contiene en su parte superior una gran masa de
gas. Responde:
a) ¿Qué precauciones se deben tener en la explo-
tación del petróleo?
b) ¿Cuál es el impacto ambiental de la explotación
del petróleo?
c) ¿Qué compromisos debe cumplir una em-
presa que explota el petróleo en relación con el
medio ambiente?
7. Show the numerical setup of titration formula (MA)(VA)=(MB)(VB)
Answer:
i believe it is 17x=(4)x*4 +11*(0)
Explanation:
Scientific discoveries are often built on the previous findings of other scientists. Millikan’s oil drop experiment occurred after Thompson’s cathode ray tube experiment. What did both of these experiments collectively determine about the atom’s subatomic structure? Check all that apply.
Answer:
atoms contain negatively charged particles
the electron has a specific mass
Explanation:
got this shyt wrong for yall folks
Answer:
1 and 3
Explanation:
just had this question
25. How is the information in an image sent through the digital signal system?
A text codes
B binary codes
C pixel codes
D as whole images
8.
(a) Tick (™) the box next to the correct statement about the mixture.
mixture of four elements
mixture of four compounds
mixture of two elements and two compounds
mixture of one element and three compounds
Answer:
mixture of four compounds
mixture of two elements and two compounds
Explanation:
it can be one of thosecan u tell me if its correct pls I'm studying this tooCAN SOMEONE PLEASE HELP ME WITH THIS I REALLY NEED HELP
Answer:
B
Explanation:
There's a three in front of the CH3COOH. But let's figure it out without that 3.
1 mol of CH3COOH has 3 H from CH3 and 1 hydrogen at the end. In all 4 hydrogens.
Now put the 3 in front 3CH3COOH multiplies everything by 3. So you had 4 before and with the 3 in front you must have 12.
Try it. Draw it out.
CH3COOH has 4
CH3COOH has 4
CH3COOH has 4
Total 12
That's B