Answer:
4.10 x 10⁻⁸ M
Explanation:
The molarity (M) of a solution is defined as the number of moles of solute per liter of solution. We have to first calculate the number of moles of solute (benzene) from the mass and the molecular weight:
Benzene has the chemical formula C₆H₆. So, its molecular weight (MW) is calculated from the molar mass of C (12 g/mol) and H (1 g/mol):
MW(C₆H₆)= (12 g/mol x 6 C) + (1 g/mol x 6 H) = 78 g/mol
Then we convert the mass of benzene (0.32 mg) from mg to grams and divide the mass into the MW:
mass = 0.32 mg x 1 g/1000 mg = 3.2 x 10⁻⁴ g
moles of benzene = mass/MW = 3.2 x 10⁻⁴ g/(78 g/mol) = 4.10 x 10⁻⁶ mol
Now, we convert the volume of solution from dm³ to L:
liters of solution = 100 dm³ x 1 L/1 dm³ = 100 L
Finally, we divide the moles of benzene into the volume of solution in liters:
M = moles of benzene/liters of solution = 4.10 x 10⁻⁶ mol/100 L = 4.10 x 10⁻⁸ mol/L = 4.10 x 10⁻⁸ M
What will happen when iodine solution is added to a solution of potassium bromide?
A)No reaction
B)Solid iodine is produced
C)Bromine is produced
Answer:
C) Bromine is produced
Explanation:
When iodine chemically reacts with potassium bromide then it will lead to the formation of potassium iodide and bromine. This reaction is actually a single displacement reaction in which bromine from potassium bromide is displaced by iodine atom.
When iodine solution is added to potassium bromide solution ,bromine is produced. It is an example of displacement reaction.
What are displacement reactions ?
Displacement reactions are chemical reactions in which one element present in a compound is replaced by another element.The reaction generally takes place between a molecule and a compound.
During the reaction, the anion of compound is replaced by the molecule and the anion of the compound is transformed into a molecule.When iodine molecule in form of solution is reacted with solution of potassium bromide solution of potassium iodide is obtained.
During this reaction anion of potassium bromide that is bromine is replaced by iodine forming solution of potassium iodide and molecule of bromine is liberated in the form of gas.
Learn more about displacement reactions,here:
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I WILL MARK THE BRAINLYEST AND GIVE YOU 100 POINTS
PLEASE HELP ME!!!!!!!!! I DONT UNDERSTAND THIS! :(
CONVERT 65 GRAMS OF OXYGEN TO MOLES.
IM CONFUSED !
IF YOU ANSWER THIS I NEED THE STEP OF HOW YOU FOUND IT TOO!!! AND WHY THAT IS THE ANSWER TOO!!!!!
Answer:
4.0625
Explanation:
1 grams Oxygen to mol = 0.0625 mol
0.0625 x 65 =4.0625
Answer:
what the other guy said
Explanation:
A behavioral adaptation when an animal becomes inactive in the winter is _____.
A. hibernation
B. camouflage
C. migration
D.sleeping
Answer:
A. hibernation
Answer:
Hibernation.
Explanation:
I need help pls...Thanks
Answer:
4. 125°C
Explanation:
I hope this helps you :D
Answer:
Explanation:can you take a pic of it a little up so i can see the h please??
Name a non-metal used to make electrode in the cell.
Answer:
graphite
Explanation:
graphite is also good conductor of electricity
What is the noble gas configuration for zirconium?
Answer:
[Kr] 4d² 5s² option b will be correct answer
Select the correct answer.
What is the chemical name of the covalent compound SF6?
A.
monosulfur hexafluoride
B.
monosulfide hexafluorine
C.
sulfur hexafluoride
D.
hexasulfur fluoride
Answer:
sulfur hexafluoride....
Answer:
c. Sulfur hexafluorideExplanation:
Sulfur hexafluoride (SF6) or sulphur hexafluoride (British spelling), is an extremely potent and persistent greenhouse gas that is primarily utilized as an electrical insulator and arc suppressant. It is inorganic, colorless, odorless, non-flammable, and non-toxic. SF.
MARK ME BRAINLISTPLZ FOLLOW MECopper(ii) nitrate was dissolved in water to form an aqueous solution. Aqueous sodium hydroxide formed a light blue precipitate. What is the formula?
Answer:
Cu(OH)₂ ⇒ copper(II) hydroxide
Explanation:
Copper(II) nitrate (Cu(NO₃)₂) dissociates into ions in an aqueous solution to form Cu²⁺ ions and NO₃⁻ (nitrate) ions. If the aqueous solution contains sodium hydroxide (NaOH), which dissociates into Na⁺ and OH⁻ ions, a precipitate is formed from Cu²⁺ and OH⁻ ions. The precipitation reaction is the following:
Cu(NO₃)₂(aq) + 2 NaOH(aq) → Cu(OH)₂(s) + 2 NaNO₃(aq)
The light blue precipitated formed is copper (II) hydroxide (Cu(OH)₂), because it is an insoluble solid product.
What can be inferred from the graph?
do the yoga boi TUT yooooooooooooooooooooo9ooooooooot
describe how an ion is made
What is the function of the Intercostal Muscle
Answer:
The intercostal muscles also stabilize the chest wall; in full inspiration they contract to prevent the intercostal spaces being sucked inwards by the negative intrathoracic pressure generated by contraction of the diaphragm.
Explanation:
Hope this helps! Brainliest is always appreciated :)
2 Write a word equation and
a symbol equation for the
reaction of solid zinc oxide
(ZnO) with sulfuric acid.
Answer:
Zinc oxide is react with sulphuric acid to give zinc sulphate and water.
zinc oxide +sulphuric acid ⇒ zinc sulphate + water
Zno +H2So4 ⇒ZnSo4 + H2O
SULPHURIC ACID = H2SO4
ZINC SULPHATE =ZnO
Explanation:
How many grams are in 1.11 molecules of N2?
Answer:
15.547437000000029
Explanation:
Vitamin C has an empirical formula of C3H4O3 and a molecular mass of 176 amu. What is the molecular formula of vitamin C?
Answer:
(C3H4O3) x 2 = C6H8O6, the molecular formula for Vitamin C.
Cloudy nights are often warmer than clear nights. Why is this so?
The clouds generate wind
The clouds trap heat energy during the daylight hours
The clouds store and release heat from the inner Earth
The clouds release heat generated by the friction of air molecules
Answer: B
Explanation: The clouds act almost like a lid. Think of it like when you put tin foil over food before it goes in the oven. so that even after it is removed from the heat the tin foil traps it causing it to stay warm.
How does Cancer Begin?
Answer:
Cancer is a disease caused when cells divide uncontrollably and spread into surrounding tissues.
Explanation: Cancer is caused by changes to DNA. Most cancer-causing DNA changes occur in sections of DNA called genes. These changes are also called genetic changes.
-Hope this helped
i/3 of 12 = 2/3 of
please help at 11 o'clock am it needs to be done
Answer:
6
Explanation:
This question is seeking for an equivalent of one expression. The first expression says 1/3 of 12, which means 1/3 × 12 = 4. To find 2/3 of a number that will give us 4, we say
Since; 1/3 of 12 is 4
Then, 4 = 2/3 of x, where x is the number, which when multiplied by two-third (2/3) will result to 4.
4 = 2/3 × x
4 = 2x/3
Cross multiply
2x = 3 × 4
2x = 12
x = 12/2
x = 6.
This means that; 1/3 of 12 = 2/3 of 6
HELP ASAP!!!!
Which statements describe rechargeable batteries? Check all that apply.
Charging rechargeable batteries allows the non-spontaneous reaction within the batteries to proceed.
Charging rechargeable batteries allows the spontaneous reaction within the batteries to proceed.
The rechargeable battery is an example of a voltaic cell.
The rechargeable battery is an example of an electrolytic cell.
Answer: A, C, D
Explanation:
Right on Edge
Answer:
1.) Charging rechargeable batteries allows the non-spontaneous reaction within the batteries to proceed.
3.) The rechargeable battery is an example of a voltaic cell.
4.) The rechargeable battery is an example of an electrolytic cell.
Explanation:
got it right on edge
Which electromagnetic wave has the longest
wavelength? Describe the energy level and
frequency of this wave.
Answer:
radio waves
Explanation:
which has the longest wavelength and lowest frequency and energy. Ultraviolet light (UV) is divided into three regions: UV A, wavelength = 400 - 320 nm UV B, wavelength = 320 - 280 nm
NEED ASAP!! WILL GIVE BRAINLIEST!! Only have 10 minutes left please help.
3. (50 points) What is the mass of 80.0L of Oxygen gas (02) at 2 atm and 50 ° C in temperature? Mass should be in units of grams.
Show work!
Answer:
i just feel rlly bad that you need it now, i cant help but all i can say is you got this mate
Mention the reason why aquatic plants have air filled tissues.
Answer:
Aquatic plants have aur filled tissues to make them easy to float.....
Explanation:
It provides buoyancy
What type of nonvisible light has a longer wavelength than the color red?
Answer:
i believe its blue
Explanation:
Al + Fe2O3 --> Al2O3 + Fe
How many grams of Al2O3 would be produced when 10.0 grams of Al is reacted with an excess supply of Fe2O3? You must show work to get full credit.
Answer:
18.88 grams of Al2O3
Explanation:
Here's my work
10g Al l 1 mol Al l 1 mol Al2O3 l 102g Al2O3
l 27g Al l 2 mol Al l 1 mol Al2O3
Balanced equation: 2Al +Fe2O3 --> Al2O3 + 2Fe
So pretend it's in a chart, you fill it out starting from the top left corner and then moving diagonally down and then straight up and then diagonally down and the straight up, etc. You start with 10 grams of Al, so the first thing you want to do is convert it into moles. So you find the mass of Al(which is 27) and then you have 1 mol of Al on top. So the next thing you have to do is to change it to Al2O3 since that is what the question is asking for. This is where it's important you balanced the equation correctly because you're going to compare the mol ratios. To do this, you have to look at the coefficients in front of Al, which is a 2. so you write 2 mol Al on the second bottom section. and then on top you look at the balanced equation again and look at the coefficient in front of Al2O3, which there is none so it's a 1. Then all you have to do is convert back to grams because the question wants it in grams. so you put 1 mol on the bottom and then you look at your periodic table to figure out the mass of Al2O3. Al= 27, O= 16. (27x 2) + (16 x 3) = 102. Finally you just multiply all the numbers on the top row and then multiple all the numbers on the bottom row and then divide what you get on the top by the bottom.
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
Does an increase in temperature always indicate that a chemical change has occurred?
I need a yes or no answer with a simple explanation, please...
Of the following choices, which is the best way to help Earth's water supply
last for future generations?
A. Build thermal power plants.
B. Reduce residential water use.
C. Promote private swimming pool construction.
D. Avoid drip irrigation systems on farms.
The best way for helping the earth water supply that should be last for future generations should be considered option b. where it decrease the residential water usage.
What is residential water?The average American family should be used for more than 300 gallons of the water per day at home. Approximately 70% of the use should arise indoors,
Moreover, outdoor water should be accounted for 30% of household that should be high in drier parts for the country and it should be more water intensive landscape.
Therefore, the option b is correct.
Learn more about water here: https://brainly.com/question/20229458
How many moles are present in 2.6 g of CO2?
Answer:
0.059 moles are present in 2.6 g of CO₂
Explanation:
Molar mass is the mass of one mole of a substance, which can be an element or a compound. That is, it is the amount of mass that a substance contains in one mole.
In this case, the mass of each element being:
C: 12 g/moleO: 16 g/molethen the molar mass of the compound is:
CO₂= 12 g/mole + 2*16 g/mole= 44 g/mole
Then you can apply the following rule of three: if by definition of molar mass 44 grams of CO₂ are present in 1 mole, 2.6 grams will be present in how many moles?
[tex]amount of moles=\frac{2.6 grams*1 mole}{44 grams}[/tex]
amount of moles= 0.059 moles
0.059 moles are present in 2.6 g of CO₂
The following equation illustrates the chemical reaction that occurs in a plant.
Water + carbon dioxide + light energy → sugar + oxygen.
Based on the law of conservation of energy, what happened to the light energy in the reaction?
A) It was produced by the plant.
B) It was destroyed
C) It was changed into oxygen gas
D) It was converted into chemical energy stored in the sugar.
it was produced by a plant
A chemistry student measures out 41 grams of sodium hydroxide, NaOH. They react it with an excess of hydrochloric acid, HCl, forming water and sodium chloride, NaCl. After boiling away the water and the HCl, they find the mass of the NaCl to be 25.5 grams. What is their percent yield? (Don't forget to write a balanced equation)
85. Compare a mole of Ag-108 and a mole of Pt-195 using
atoms, protons, electrons, and neutrons.
Explanation:
1 mol of an atom (irregardless of the element) contains the Avogadro's number of atoms. This is given as;
1 mol = 6.022 * 10^23 atoms
For a neutral atom;
NUmber of protons = Number of electrons
The relationship between proton and neutron is given as;
Mass Number = Protons + Neutrons
Ag-108
Atoms = 6.022 * 10^23 atoms
Protons = Atomic Number = 47
Electrons = 47
Neutrons = Mass Number - Protons = 108 - 47 = 61
Pt-195
Atoms = 6.022 * 10^23 atoms
Protons = Atomic Number = 78
Electrons = 78
Neutrons = Mass Number - Protons = 195 - 78 = 117
