Answer:
C4H4O
Explanation:
1.24 g x 1mol/(44)g = 0.03mol C;
Mass of C: 0.03mol x 12.g/1mol
= 0.36g of C
mol of H: 0.255g x 1mol /(18) x2= 0.028mol
Mass of H; = 0.028g × 1 of H
Mass of O: 0.519 g – (0.36g +0.028g)= 0.131g;
0.131g/16 =0.008 mol
Divide by the smallest number of moles;
0.028/0.008 mol = 3.5; 0.03/0.008 mol =3.75, 0.008 mol/0.008 mol =1
C4H4O
Many reactions double their rates with every ten degrees rise in temperature. Assume that such a reaction takes place at 301 K and 311 K. What must its activation energy be for this statement to hold
Answer:
57.6 KJ/mol
Explanation:
We have that;
T1 = 301 K
T2= 311 K
k1 = k1
k2= 2k1
R = 8.314 JK-1
Ea= ?
So;
ln(k1/k2) = (-Ea/R) (1/T1 - 1/T2)
ln (k1/2k1) = -(Ea/8.314) (1/301 - 1/311)
ln(1/2) = -(Ea/8.314) (3.3 * 10^-3 - 3.2 * 10^-3)
-0.693 = -(Ea/8.314) 0.1 * 10^-3
-0.693/ 0.1 * 10^-3 = -(Ea/8.314)
-6930 = -(Ea/8.314)
Ea = 6930 * 8.314
Ea = 57.6 KJ/mol
How many atoms of oxygen are contained in 160 grams of N203?
Answer:
i think it is 1.27 x1024
Explanation:
i don't really know though
Answer:
(160/28+48)=(160/76)*6.022x10²³
Coach Ramirez made a cup of tea and stirred it with a spoon. The spoon became warm, How was the heat from the tea transferred to the spoon? *
Convection
Conduction
Radiation
Evaporation
What type of reaction is shown here?
6Li + Ca3(PO4)2 → 2Li3PO4 + 3Ca
How many molecules of water are required for the polymerization of a 22 monomer-long cellulose molecule
Answer:
21 molecules of water.
Explanation:
The polymerization of a 22-monomer long cellulose molecule will require 21 molecules of water. This is because the polymer bond is formed when the -OH group from the 1st monomer of the glucose unit and the H group from the 2nd monomer gets removed as a water molecule. This process is termed to be a condensation reaction.
a change in matter in which the density of the inatter
stays the same
Answer: A physical property that will be the same regardless of the amount of matter. Extensive Properties: A physical property that will change if the amount of matter changes.
Choose ALL of the factors that influence climate
Lesson 1.03
closeness to bodies of water
Altitude ( height above sea level)
latitude
geographic location
ocean currents
Answer: Its all of them
Explanation: I just took the test
A 4kg bowling ball is held 2.5 meters above your head. A 0.5 kg tennis ball is held at 12 meters above your head. Which one has more potential energy
Answer:
P.E for the 4kg bowling ball held 2.5 meters above head is 100j, while the other is 60j so the 4kg ball has more potential energy
Which of the following is a covalent compound? *
CO2
OK20
O Naci
O MgCl2
Answer:
this question is badly formatted. CO2
Explanation:
the answer is CO2 because C and O are both anions/nonmetals. the other examples contain a cation/metal, so they're ionic compounds
Draw the organic and inorganic products of the reaction, describe the type of bond cleavage, and classify the reaction.
Answer:
See explanation and images attached
Explanation:
The complete question his shown in the image attached to this answer.
This reaction is a substitution reaction. We identify it as a substitution reaction because one specie replaced another in the substrate.
The organic product and inorganic products were also shown in the image. The bond was breakage is a hetereolytic fission since the two electrons of the bond reside on only one of the species.
Observe the sodium and chlorine atoms. Assuming that the inner rings are full of electrons, how many electrons are there total in each atom
Answer:
See explanation
Explanation:
Chlorine has three shells. We know that the first shell contains two electrons, the other shell has eight electrons while the last shell has seven electrons. This means that chlorine has seventeen electrons.
For sodium, there are also three shells. The first shell has two electrons as usual. The next shell has eight electrons while the last shell has only one electron. This makes a total of eleven electrons for sodium.
Answer: sodium-11
chlorine-17
Explanation: meow
What type of succession takes place when a community starts to grow?
A. Primary
B. Secondary
Answer:
Primary
Explanation:
Succession is a series of progressive changes in the composition of an ecological community over time. In primary succession, newly exposed or newly formed rock is colonized by living things for the first time.
Write balanced chemical equations for the sequence of reactions that oxalic acid can undergo when it's dissolved in water.
Answer and Explanation:
The balanced chemical equations are as follows:
The chemical formula of oxalic is [tex]H_2C_2O_4[/tex]
In the case when oxalic acts reacted with the water so here the oxalic acid eliminates one proton that leads to the development of mono acids
After that, the second step derives that when oxalic acid is in aqueous solution eliminates other proton so it represent the polyprotic acid
Now the chemical equations are as follows:
Elimination of one proton
[tex]H_2C_2O_4(aq)+H_2O(l) \rightarrow H_2C_2O_4^-(aq) + H_3O^+(aq)[/tex]
Now the elimination of other proton
[tex]HC_2O_4^-(aq)+H_2O(l) \rightarrow C_2O_4^2^-(aq) + H_3O^+(aq)[/tex]
Calculate the volume in milliliters of a 5.11/mol silver nitrate solution that contains 175.g of silver nitrate AgNO3. Round your answer to 3 significant digits.
Answer:
[tex]V=202mL[/tex]
Explanation:
Hello!
In this case, considering we have a 5.11-molar solution (5.11 M) that contains 175. g of silver nitrate, we first need to compute the moles of solute as its molar mass is 169.87 g/mol:
[tex]n=175g*\frac{1mol}{169.87 g} =1.03mol[/tex]
Next, since the definition of molarity is moles over volume:
[tex]M=\frac{n}{V}[/tex]
We solve for the volume and plug in the molarity and moles as shown below:
[tex]V=\frac{n}{M} =\frac{1.03mol}{5.11mol/L}\\\\V =0.202L[/tex]
However, as it is needed in milliliters, we convert the L to mL:
[tex]V=0.202L*\frac{1000mL}{1L}\\\\V=202mL[/tex]
Best regards!
How many moles are in 6.21x1025 atoms of magnesium oxide?
Answer: 55.56 moles of MgO
Explanation:
1 mole = avogadro number
if 6.21x10^25 atoms then molecules of MgO (equal numbers of Mg and O atoms)
= 0.5*6.21x10^25 = 3.105 molecules of MgO
So moles of MgO = 0.5*6.21*10^25/avogadro number = 55.56
50POINTS!
If I held a 45.3 moles of a gas at a constant volume of 56.4L and a temperature 310.5k, what is the pressure being exerted on the gas?
A. 20.5 atm
B. 27.7 atm
C. 23.9 atm
D. 17.4 atm
Answer:
A. 20.5 atm
Explanation:
Using the formula Pv=.nRt
Answer:
PV=nRT
P(56.4)=45.3×0.08206×310.5
P=1154.227/56.4
=20.4650
Approximately 20.5 then A is the answer
What is the molar mass of magnesium
nitrate? Round to the nearest 0.01, and
include correct units AND substance
formula.
ANYONE CAN HELP ME WITH QUESTION PLEASE ?
Answer:148.31 Grams per mol
Explanation: It has been a long time since I took chemistry.
I believe you add up all the elements molar mass.
magnesium nitrate is Mg(NO3)2 so you add
MG 24.30
N 14.01 * 2 = 28.01
O 16.00 * 6 = 96.00
total is 148.31 grams per mol
I hope this helps.
The molar mass of magnesium nitrate is 148.31 grams per mol.
What is molar mass ?
The term molar mass is defined as the ratio between the mass and the amount of substance of any sample of the known compound. A mole of any substance is 6.022 × 10²³ molecules.
1 mole = 6.022 × 10²³ elementary entities.
The molar mass of a substance is calculated by adding the quality atomic masses in g/mol of the constituent atoms. Molar mass is represented by the symbol "M".
For calculating molar mass of magnesium nitrate is Mg(NO3)2
Mg = 24.30
Nitrogen = 14.01 × 2
= 28.01
Oxygen = 16.00 × 6
= 96.00
Therefore, molar mass of magnesium nitrate is Mg(NO3)2
= 24.30 + 28.01 + 96.00
= 148.31 grams per mol.
Thus, The molar mass of magnesium nitrate is 148.31 grams per mol.
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Could someone help as soon as possible PLEASEEEEEEEEE...
Answer:
A, D, E
Explanation:
a. "A dog panting to stay cool on a hot day" is a mechanism the dog employs to maintain it's body temperature. This is homeostasis.
d. "A bear hibernates in order to reduce their metabolism and conserve energy during the winter" is also all about keeping the internal condition of the bear's body constant. So this is also an example of homeostasis.
e. The lizard trying to keep regulate it's body temperature is also part of homeostasis.
A gas made up of homonuclear diatomic molecules escapes through a pinhole 0.936 times as fast as N2 gas. Write the chemical formula of the gas.
Answer:
See explanation
Explanation:
Let the rate of diffusion of the unknown gas be x
Let the rate of diffusion of nitrogen be y
Let molecular mass of unknown gas be MX
Let molecular mass of nitrogen be My
Hence;
x/y = √My/MX
0.936/1 = √28/MX
(0.936/1)^2= 28/MX
MX= 28/0.876096
MX= 32 g/mol
MX is O2 gas
which if the following is not an example of chemical change
A.iron crusting
B.cutting paper
C. apple ripening
D.a piece of wood burning
Which causes genetic variations and can result in different alleles?
predation rate
random mutations
competition
environmental changes
Answer:
Environmental Changes
Explanation:
Answer:
d
Explanation:
What is the mass of two moles of the diatomic gas, N2
Answer:
[tex]m_{N_2}=56.04 gN_2[/tex]
Explanation:
Hello!
In this case, since nitrogen diatomic gas is a molecule that has the following molar mass:
[tex]M_{N_2}=14.01*2\\\\M_{N_2}=28.02g/mol[/tex]
Thus, since we have two moles of this molecule, we can compute the referred mass as shown below:
[tex]m_{N_2}=2molN_2*\frac{28.02gN_2}{1molN_2}\\\\m_{N_2}=56.04 gN_2[/tex]
Best regards!
Circle the letter of cach sentence that is true about silica.
a. It is formed from oxygen and nitrogen. b. It makes magma thicker, .
C. It is rarcly found in the crust,
d. It produces light-colored lava.
Answer:
The correct answer choices are B and D.
Explanation:
A volcanic eruption happens when magma reaches the surface of the earth. Depending on the amount of gas and the silica content of the magma, the lava and the type of eruption can vary. Silica, which forms from the elements silicon and oxygen, makes the lava thicker and less runny. When lava is thick, the volcanic eruption tends to be more explosive. The amount of silica also changes the color and density of the lava, which then makes different kinds of igneous rocks. As the gas content of the lava goes up, the eruption becomes more explosive.
What is the name of the compound Hg4SiO4?
Answer:
mercury (I) silicate
Explanation:
Which substance can not be broken down by a chemical change?
A)
magnesium
B)
water
C)
methane
D)
ammonia
Answer:
a
Explanation:
its too much of a solid to be broken down
The substance can not be broken down by a chemical change is A)magnesium.
What is a substance?substance can be regarded as a particular kind of matter which posses a uniform properties.
Therefore, during a chemical change all the given substance can be broken down because they are compounds, but magnesium is an element which cannot be broken down.
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______ is a state function dealing with the disorder of the universe, and therefore the likelihood that a chemical reaction will take place. g
Answer: Entropy.
Explanation:
If we recall the laws of thermodynamics, there is a state function called entropy, that is related to the disorder in the system.
Such that, for example, in a gas expansion, we will have an increase in the "disorder" then we will have an increase in the entropy, this happens because we have more volume where the particles can be, then we have a larger number of "microstates" (or microscopic states, which refers to the states of the particles that conform the gas)
Particularly, when we go into statistical thermodynamics, there is something called the "Statistical entropy" that is related to the information theory, where the entropy depends on the number of possible outcomes that some event, like a chemical reaction, can have.
For a larger number of possible outcomes, we will have a larger entropy (we can think of this larger number of possible options as a disorder) and this entropy will be related to the statistical probability of each one of those outcomes.
Where the (most general) equation for the entropy is:
S = Kb*Σpₙ*ln(pₙ)
Where pₙ is the probability for the n-th outcome.
Kb is Boltzman's constant.
In the laboratory you are asked to make a 0.175 m barium sulfide solution using 15.4 grams of barium sulfide. How much water should you add
Answer:
0.5195 liters of water
Explanation:
First we convert 15.4 grams of barium sulfide (BaS) into moles, using its molar mass:
15.4 g ÷ 169.39 g/mol = 0.0909 molThen we calculate the required volume of water, using the definition of molarity:
molarity = moles / volume0.175 M = 0.0909 mol / VolumeVolume = 0.5195 L34 atoms of carbon (C) react with 22 molecules of hydrogen gas (H2). How many molecules of methane (CH4) will be formed, and what will be left over
Answer:
11 molecules of CH4.
23 atoms of C is the leftover.
Explanation:
Hello!
In this case, for the formation of methane:
[tex]C+2H_2\rightarrow CH_4[/tex]
We can see there is an excess of carbon based on their stoichiometry, because the needed amount of hydrogen gas molecules would be:
[tex]molecules _{H_2}=34atomC*\frac{2molec\ H_2}{1atomC} =68molec\ H_2[/tex]
Thus, the formed molecules of methane are computed below:
[tex]molec\ CH_4=22molec\ H_2 *\frac{1molec\ CH_4}{2molmolec\ H_2} \\\\molec\ CH_4=11molec\ CH_4[/tex]
In such a way, the leftover of carbon atoms are:
[tex]atoms \ C^{left over}=34-22molec\ H_2*\frac{1atoms C}{2molec\ H_2} \\\\atoms \ C^{left over}=23 atoms C[/tex]
Best regards!
3. Which compound has the greatest molar mass?
A. H2O B. C6H12O6 C. HNO3 D. C2H6
C₆H₁₂O₆ has the greatest molar mass (180 g/mol)
Further explanationGiven
Compounds of A. H2O B. C6H12O6 C. HNO3 D. C2H6
Required
The greatest molar mass
Solution
The molar mass(molecular mass-formula mass) of a compound is the sum of the relative atomic mass (Ar) of the constituent elements of the compound
A. H₂O : 2.1+16 = 18 g/mol
B. C₆H₁₂O₆ : 6.12+12.1+6.16=180 g/mol
C. HNO₃ : 1.1+1.14+3.16=63 g/mol
D. C₂H₆ : 2.12+6.1 = 30 g/mol
at a particular temperature, asample of pure water has a Kw of 1.7x10-12. what is the hydroxide concentration of this sample
Answer:
Hydroxide concentration of the sample is 1.3x10⁻⁶M
Explanation:
The equilibrium constant of water, Kw, is:
H₂O(l) ⇄ H⁺(aq) + OH⁻(aq)
Kw is defined as:
Kw = 1.7x10⁻¹² = [H⁺] [OH⁻]
As the sample is of pure water, both H⁺ and OH⁻ ions have the same concentration because come from the same equilibrium, that is:
[H⁺] = [OH⁻]
We can write the Kw expression:
1.7x10⁻¹² = [OH⁻] [OH⁻]
1.7x10⁻¹² = [OH⁻]²
1.3x10⁻⁶M = [OH⁻]
Hydroxide concentration of the sample is 1.3x10⁻⁶M