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
Question 11
What/mass of oxygen is needed to fill a 585 L tank at STP?
0.417 kg
0.835 kg
0.765 kg
Answer:
0.835 Kg
Explanation:
We'll begin by calculating the number of mole of oxygen that will fill 585 L tank at STP. This can be obtained as follow:
1 mole of oxygen (O2) occupies 22.4 L at STP.
Therefore, Xmol of oxygen will occupy 585 L tank at STP i.e
Xmol of oxygen = 585/22.4
Xmol of oxygen = 26.12 moles
Next, we shall determine the mass of 26.12 moles of oxygen. This can be obtained as follow:
Mole of O2 = 26.12 moles
Molar mass of O2 = 2 × 16 = 32 g/mol
Mass of O2 =?
Mole = mass /Molar mass
26.12 = mass of O2 /32
Cross multiply
Mass of O2 = 26.12 × 32
Mass of O2 = 835.84 g
Finally, we shall convert 835.84 g to Kg. This can be obtained as follow:
1000 g = 1 Kg
Therefore,
835.84 g = 835.84 g × 1 Kg / 1000 g
835.84 g = 0.835 Kg
Thus, 835.84 g is equivalent to 0.835 Kg.
Therefore, the mass of oxygen needed to fill the 585 L tank at STP is 0.835 Kg
1. Which statement is true about the Milky Way Galaxy?
O It is an irregular galaxy.
O It is a spiral galaxy.
It contains no more than 100 million stars.
New stars are not being created in it.
Answer:
Answer choice B. It is a spiral Galaxy
If the volume of an irregular sound is determined by the water displacement technique, its volume will be equal to
how many hydrogens are in carbon tetrahydride?
Answer:
4
Explanation:
Carbon tetrahydride is better known as methane.
Methane is an alkane with a chemical formula CH₄. It is a gaseous organic compound.
Within the compound, there is a central carbon atom. Which is bonded covalently to 4 hydrogen. So, there are 4 hydrogens in a carbon tetrahydrideWhat 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
A teaspoon of dry coffee crystals dissolves when mixed in a cup of hot water. This process produces a coffee solution. Which term best identifies how the original crystals are classified?
-Reactant
-product
-solvent
-a solute
Answer:
The correct answer is - solute.
Explanation:
A solute is one half of a solution that is dissolved in the other half of the solution, known as the solvent. Solute particles are always less or lower in quantity or concentration than the solvent in a solution.
In this case, coffee crystals are dissolved in hot water so the solute will be coffee crystals and the amount of coffee crystals are also less than the amount of solvent.
Answer:
solute
Explanation:
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)
the oldest rock on the bottom and newest on the top is called ____________
law of superposition
law of position
Law of gravity
Answer:
Law of position
Explanation:
Answer:
Law of Superposition
Explanation:
"A major principle of stratigraphy stating that within a sequence of layers of sedimentary rock, the oldest layer is at the base and that the layers are progressively younger with ascending order in the sequence."
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:
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
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:
write your own definition of the word “particle” as it used in chemistry.
please do it now!! do not COPY from the internet.
Explanation:
Its a particle that can come from loads of things like mass for example, or gas, liquid or solid
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:
what is the combustion reaction for CH3OH(l)
Answer:
CH3OH(l) + 3 2 O2(g) → CO2(g) + 2 H2O(l
Explanation:
.
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
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
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
A solution is made by adding 27 g of barium chloride into 74 g of water. What is the mass percentage of this barium chloride in this solution, to the units place?
Answer:
27 %
Explanation:
Step 1: Given data
Mass of barium chloride (solute): 27 gMass of water (solvent): 74 gStep 2: Calculate the mass of the solution
The mass of the solution is equal to the sum of the mass of the solute and the mass of the solvent.
m = 27 g + 74 g = 101 g
Step 3: Calculate the mass percentage of this barium chloride in this solution
We will use the following expression.
%m/m = mass of barium chloride / mass of solution × 100%
%m/m = 27 g / 101 g × 100%
%m/m = 27 %
Which event always involves a chemical change?
Answer:
BurningExplanation:
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
Jaxson needs to react 16.3 moles of copper (II) nitrate, Cu(NO3)2, in a chemical reaction. How many grams of crystals
does he need to weigh out?
Answer:
3056.25g
Explanation:
Problem here is to find the mass of Cu(NO₃)₂ to weigh out to make for the number of moles.
Given;
Number of moles = 16.3moles
Unknown:
Mass of Cu(NO₃)₂ = ?
Solution:
To find the mass of Cu(NO₃)₂, use the expression below;
Mass of Cu(NO₃)₂ = number of moles x molar mass
Let's find the molar mass;
Cu(NO₃)₂ = 63.5 + 2[14 + 3(16)]
= 63.5 + 2(62)
= 187.5g/mol
Mass of Cu(NO₃)₂ = 16.3 x 187.5 = 3056.25g
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:
Question: How does mass and volume affect sinking and floating?
Please don't plagiarize
.....
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:
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 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.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 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
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
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]
