22. What is the molar mass of oxygen (O2)?
A- 15.9994 g/mol
B- 1.204 x 1024 g/mol
C- 6.02 x 1023 g/mol
D- 31.9988 g/mol
Answer:
D- 31.9988 g/mol
Explanation:
The molar mass of a substance is the mass in grams of one mole of the substance. For a compound, the molar mass is the gram - formula mass or gram - molecular weight. It is determined by the addition of its component atomic masses;
To find molar mass of O₂;
Atomic mass of O = 15.9994g/mol
Molar mass of O₂ = 2(15.9994) = 31.9988g/mol
Do you Believe in soulmates why or why not
Answer:
I do because there are certain people that are right for you. If there was no such thing as soulmates, you could just get with anyone and it wouldnt matter. You dont just fall in love with anyone. You may mistake love for something else. But when you're in love you'll know. Twin flames are not the same. Some people mistake twin flames with soulmates. They are close but not so much in a way.
Explanation:
Answer:
Ye
Explanation:
Describe how this instrument works.
Operation:
Answer:
It amplifies the picture of something far away.
Explanation:
Answer:
Light from the moon reflects from large mirror, bent by small mirror, focused at focal point, magnified by eyepeice.
Explanation:
what is the combustion reaction for CH3OH(l)
Answer:
CH3OH(l) + 3 2 O2(g) → CO2(g) + 2 H2O(l
Explanation:
.
What does the main difference between protons and neutrons
Answer:
The main difference is that neutrons are neutral while protons are positive.
Explanation:
Neutrons have nor charge and protons have a positive charge. Hope this helps!
Answer:
Protons: Determine the element
Neutrons: Is for the Average atomic mass or AMU for short.
Explanation:
NaF +
A.
Br2
NaBr
+
F2
Na=
F=
Na=
F=
1. Use equation A to choose the correct coefficients from the answers below:
a. 2,1,2,1
b. 3,2,1,1
c. 1,2,2,1
d. 2,3,1,1
2. Use Equation A to identify the type of reaction:
a. Synthesis
b. Decomposition
c. Single Displacement
d. Double Displacement
B.
K +
Cl2
КСІ
K=
CI=
K=
CI=
3. Use equation B to choose the correct coefficients from the answers below:
a. 3,1,2
b. 2,1,3
c. 2,1,2
d. 1,2,1
Answer:
1. 2121
2. i have no idea
3. 212
Explanation:
Define and give an example of each of Law of Conservation of Mass
Answer:
The law of conservation of mass states that matter cannot be created or destroyed in a chemical reaction. For example, when wood burns, the mass of the soot, ashes, and gases equals the original mass of the charcoal and the oxygen when it first reacted.
Explanation:
That is what I think on the subject
1.3188g of antacid is weighed and mixed with 75.00 mL of excess 0.1746 M HCl. The excess wcid required 27.20 mL of 0.09767 M NaOH for back titration. Calculate the amount of CaCO3 in the tablet.
The amount of CaCO₃ in the tablet : 0.5219 g
Further explanationReaction
1. CaCO₃(in antacid) + 2HCl⇒ CaCl₂+H₂CO₃
2. Titration ⇒ HCl+NaOH⇒NaCl+H₂O
Reaction 2For titration :
M₁V₁.n₁=M₂V₂n₂(n=acid/base valence⇒NaOH/HCl=1)
mol HCl=mol NaOH = excess HCl
[tex]\tt 27.2\times 0.09767=2.657~mlmol[/tex]
Reaction 1mol HCl
[tex]\tt 75\times 0.1746=13.095~mlmol[/tex]
Moles of HCl used (reacted with CaCO₃) :
initial HCl - excess HCl =
[tex]\tt 13.095-2.657=10.438~mlmol=0.010438~mol[/tex]
From reaction 1 :
mol HCl : mol CaCO₃ = 2 : 1
[tex]\tt mol~CaCO_3=\dfrac{1}{2}\times 0.010438=0.005219[/tex]
mass of CaCO₃ :
[tex]\tt 0.005219\times 100~g/mol=0.5219~g[/tex]
Question: How does mass and volume affect sinking and floating?
Please don't plagiarize
.....
2. What are instrument strings made of now?
Answer: They are made of nylon, steel or sometimes gut.
Explanation:
What type of bonding would be expected in argon?
Answer:
Argon is a member of the noble gas family of elements. This means that it already has eight valence electrons in its outermost shell. Because of this, Ar rarely bonds with other atoms to form compounds
Explanation:
What is the mass percentage of carbon in 5.000 g of sucrose? 50.00 g of sucrose?
500.0 g of sucrose? Explain.
Answer:
first you have to know the molecular formula of carbon which is C12H22O11, Then with that you can calculate the mass of each element in the molecule. C:12.01*12= 144.12, H: 1.008*22= 22.176, O: 16*11= 176
Explanation: give me brainliest pls
Is this true or false? :D
Answer:
true i am pretty sure
Explanation:
the ans. is false (:) ok
2. Which property would help to determine whether matter is a solid or a liquid?
a. volume
b. color
C.shape
d.Mass
Answer:
A
Explanation:
Volume will help you determine whether is a solid or a liquid.
Have a great day
Which of the following occurs in an ionic bond? *
O Oppositely charged ions attract.
OTwo atoms share two electrons.
Two atoms share more than two electrons.
Like-charged ions attract.
Answer:
Oppositely charged ions attract.
Explanation:
In an ionic bond oppositely charged ions attracts one another by electrostatic attraction.
To form ionic bonds, chemical species must lose or gain electrons. Most metals will lose their electrons due to electropositive nature. Non-metals gains the electrons. When a substance lose electrons, it becomes positively charged. A non-metal gaining electrons becomes negatively charged. The attraction between these two species forms the ionic bond.Methane is a major component of natural gas, which is used as a fuel in homes.Write a balanced equation for the complete oxidation reaction that occurs when methane (CH4) burns in air.
Answer:
CH4(g) + 2O2(g) --> CO2(g) + 2H2O(g)
Explanation:
Methane is an hydrocarbon. Whenever hydrocarbon undergoes a reactio with oxygen, the products formed are carbon(iv) oxide and water.
The equation of the reaction is given as;
CH4 + O2 --> CO2 + H2O
Upon balancing the equation, we have;
CH4(g) + 2O2(g) --> CO2(g) + 2H2O(g)
Which event always involves a chemical change?
Answer:
BurningExplanation:
what happens when you add acetic acid vinegar and sodium bicarbonate baking soda nahco
Explanation:
oh shi sorry I wish I could help but I'm stupid
When 1.365 g of anthracene, C14H10, is combusted in a bomb calorimeter that has a water jacket containing 500.0 g of water, the temperature of the water increases by 25.89°C. Assuming that the specific heat of water is 4.18 J/(g ∙°C), and that the heat absorption by the calorimeter is negligible, estimate the enthalpy of combustion per mole of anthracene.
The law of conservation of energy can be applied to heat changes, i.e. the heat received/absorbed is the same as the heat released
Q in = Q out
Heat can be calculated using the formula:
Q = mc∆T
Heat released by anthracene= Heat absorbed by water
Heat absorbed by water =
[tex]\tt Q=500\times 4.18\times 25.89=54110.1~J[/tex]
mol of anthracene (MW=178,23 g/mol)
[tex]\tt \dfrac{1.365}{178.23}=0.00766[/tex]
The enthalpy of combustion per mole of anthracene :
[tex]\tt \Delta H=-\dfrac{Q}{n}=\dfrac{54110.1}{0.00766}=-7063981.7~J/mol\approx -7064~kJ/mol[/tex]
10) the three factors that affect the rate of weathering are:
A.climate, color, and air quality
B. climate, type of rock and pollution
C. climate, luster of rock, and pollution
Which of the following are excited in ultraviolet photoelectron spectroscopy?
A. Core electrons
B. Nonvalence electrons
C. X-rays
D. Valence electrons
Answer:
D. Valance Electrons
Explanation:
If, in a particular process, reactants are able to form products, and products are also able to form reactants, then this process may be described as:_________. A. a reversible process. B. an elementary process. C. at equilibrium. D. forbidden. E. a forward process.
Answer:
A. Reversible Process
Explanation:
Going through the meaning of the options we have;
A Reversible: This reaction involves a backward and forward step.. This means that reactant would react to form products and products in turn wold react to form reactants. This is the correct option.
B. Elementary process: This refers to a single step reaction with a single transition state and no intermediates. This option is wrong because that is not what the question says.
C. Equilibrium Reaction: This refers to a reaction in which there is no change in the concentration of the reactants and products. Rate of forward reaction is equal to the rate of backward reaction.
D. Forbidden Reaction: This is not the correct option.
E. Forward process: This refers to the reaction that involves reactants reacting to form products. This is also not correct as the question states that the products are also able to form reactants.
What properties does Chlorine have on its own?
Answer:
When isolated as a free element, chlorine takes the form of a greenish-yellow gas, which is 2.5 times heavier than air and smells like bleach. Chorine is the second-most-abundant halogen and the second-lightest halogen on Earth, after fluorine
Explanation:
What is the orbital or electronic geometry of a molecule with 0 nonbonding electron pairs and 2 bonding electron pairs?
In the process of eating, what kind of energy in food is transformed into heat energy by your body?
chemical energy
light energy
mechanical energy
Answer:The chemical energy
Explanation:because The chemical energy in the food you eat is changed into another kind of chemical energy that your body can use. Your body then uses that energy to give you the kinetic energy that you use in everything you do.
Answer:
c i think
Explanation:
what star sign would you be if you were born on 1st January?
How many moles of CO are required to produce 45.0 L of carbon dioxide at STP?
2 CO(g) + O2(g) —> 2 CO2(g)
Answer should written as X.XX moles CO
Answer:
ang hirap na nag tanung
What are three examples of matter you can see where you are right now. Thanks for the help everyone!
Answer: So you are matter, the apple, water, a computer etc.
Explanation: matter is anything that takes up space
Which of the following compounds has the lowest vapor pressure at 25°C?
a.
CH3CH2CH3
b.
CH3OCH3
c.
CH3OHCH2OH
d.
CH3CH2CH2Cl
e.
CH3CH2CH2CH3
CH₃CH₂CH₃ is a compound which has lowest vapor pressure at 25°C as it is a small chain compound without any functional group or substituent present in it.
What is a compound?Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:
1)Molecular compounds where in atoms are joined by covalent bonds.
2) ionic compounds where atoms are joined by ionic bond.
3)Inter-metallic compounds where atoms are held by metallic bonds
4) co-ordination complexes where atoms are held by co-ordinate bonds.
They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.
Learn more about compound,here:
https://brainly.com/question/13516179
#SPJ2
Calculate the pH of the resulting solution if 32.0 mL of 0.320 M HCl(aq) is added to (a) 42.0 mL of 0.320 M NaOH(aq). (b) 22.0 mL of 0.420 M NaOH(aq).
Answer:
a) pH = 11.5
b) pH= 3
Explanation:
a) lets calculate the number of moles of each reactant
moles of HCl = 32/1000 * 0.32 = 0.01024 mole
moles of NaOH = 42/1000 * 0.32 = 0.01344 moles
1 moles of HCl reacts with 1 moles of NaOH , so 0.01024 mole of HCl should react with 0.01024 moles of NaOH , but there is some excess NaOH.
excess NaOH= 0.01344 -0.01024 = 0.0032 moles
[H+]= [tex]\frac{10^{-14} }{0.0032} = 3.125 *10^{-12}[/tex]
pH= -log [3.125*10^-12) = 11.5
b) moles of NaOH = 0.00924
excess HCl present = 0.01024 - 0.00924 =.001
so excess [H+] = 0.001
pH= -log( 0.001) = 3
