Answer:
1.89 mol
Explanation:
in 250 g of ammonium sulfate 1.89 moles are present
chemical energy comes from...
1. chemical change
2. physical change
Answer:
1
Explanation:
Physical change does not cause chemical energy.
Somebody help me asap please giving brainliest
Answer:
fire > rocks > air
Change in H for
CO2 -->C+02?
Answer:
−26.4 kcal
Explanation:
According to Hess's law, the total heat changes occuring during a chemical reaction are independent of path.
2CO(g)+O
2
(g)⟶2CO
2
(g)N ,
ΔH=−135.2 kcal
The above reaction is reversed and halved, we get-
CO
2
(g)⟶CO+
2
1
O
2
(g)
ΔH=
2
135.2
kcal ....(i)
C+O
2
(g)⟶CO
2
(g)
ΔH= -94 kcal ...(ii)
Required equation
C(s)+
2
1
O
2
(g)⟶CO(g);
Adding Eqs. (i) and (ii), we get
C(s)+
2
1
O
2
(g)⟶CO(g),
ΔH =
2
135.2
−94=−26.4 kcal
The number of moles of carbon dioxide which contain 8g of oxygen is
Answer:
0.25 mole of CO₂
Explanation:
We'll begin by calculating the mass of oxygen in 1 mole of carbon dioxide (CO₂). This is illustrated below:
Molecular formula of carbon dioxide
=> CO₂
Mass of oxygen in CO₂ = 2O
= 2 × 16
= 32 g
Thus, 1 mole of CO₂ contains 32 g of oxygen.
Finally, we shall determine the number of mole of CO₂ that contains 8 g of oxygen. This can be obtained as follow:
1 mole of CO₂ contains 32 g of oxygen.
Therefore, Xmol of CO₂ will contains 8 g of oxygen i.e
Xmol of CO₂ = 8/32
Xmol of CO₂ = 0.25 mole
Thus, 0.25 mole of CO₂ contains 8 g of oxygen.
I need help please <33
Answer:
Option 3 is correct.
The atomic nucleus of each element has a unique number of protons. Therefore, the energy of the electron layers of the atoms of each element is unique.
If we have the energy released from each electron transfer between the layers of the atom, we can identify the element.
In the reaction, 2H2(g) + O2(g)
which the reactants appear is:
2H2O(1), the phase of matter in
a) solid.
b) liquid.
c) gas.
d) plasma.
Answer:
b liquid
Explanation:
2H
2
(g)+O
2
(g)⟶2H
2
O(l) is the correction reaction as during formation of water both hydrogen and oxygen are in gaseous form and produces water in liquid form.
How many MOLECULES are in 50.0 grams of lithium phosphate
Answer:
115.794361
Explanation:
this is the answer please mark me as brainleist
Answer:
115.794361
Explanation:
that would be the correct answer
ASAP!!
Identify the limiting reactant when 6 moles of CaCl2 is combined with 6 moles of Al2O3.
Reaction: 3CaCI2 + Al2O3 -> 3CaO + 2AlCI3
Answer:
just downloud smart
Explanation:
thank me later
A gas is at 39.2c and 4.50L. What is the temperature (oC) when the gas is expanded to 10L?
Answer:
420.7 degrees C
Explanation:
Use the formula V1/T1 = V2/T2 (Charles' Law) to find T2. Make sure to convert your temperatures to Kelvin by adding 273 to the Celsius temperature.
V1 = 4.50 L
V2 = 10 L
T1 = 39.2 C = 312.2 K
Solve V1/T1 = V2/T2 for T2 and you get T2 = V2T1/V1
T2 = (10 L)(312.2 K) / (4.50 L) = 693.8 K
You can subtract 273 to get the temperature back to Celsius.
T2 = 693.8 - 273 = 420.7 degrees C
Which type of front is most likely moving through this area?
A. cold front
B. warm front
C. occluded front
D. stationary front
Answer:
Cold front
Explanation:
A sample of a gas at 25°C has a volume of 150 mL when its pressure is 0.947 atm. What will the temperature of the gas be at a pressure of 0.987 atm and changes to 144mL?
*please help*
Answer:
25°C
Explanation:
Combined Gas Law (P₁V₁)/T₁ = (P₂V₂)/T₂
(0.947 atm)(150 mL)/25°C = (0.987 atm)(144mL)/T₂
5.682 = 142.128/T₂
T₂ = 142.128/5.682
T₂ = 25.0137272756°C = 25°C
Explain why you think it is important to know the three different types of rocks.
Answer:
because they contains clues about what the earth was like in the past. different rocks from under only certain conditions and even the dullest gray lump of rock.
What do you have to do if there is an unexpected violent chemical reaction in a bottle ?
Answer:
What i would do is put it in the nearest sink or better yet a bathtub. because if it was violent, do you really want that everywhere?
Explanation:
:)
A gas occupies 5.0 cubic meters at a temperature of 600. K. If the temperature is lowered to 300. K at constant pressure, the new volume occupied by the gas will be:
Answer:
[tex]V_2=2.5m^3[/tex]
Explanation:
Hello!
In this case, according to the Charles' law as a directly proportional relationship between volume and temperature:
[tex]\frac{V_2}{T_2}=\frac{V_1}{T_1}[/tex]
Thus, in order to compute the final volume, V2, we obtain the following expression:
[tex]V_2=\frac{V_1T_2}{T_1}\\\\V_2=\frac{5m^3*300K}{600K}\\\\V_2=2.5m^3[/tex]
Best regards!
Take your time please.
Answer:
1. Observing
2. Classifying
3. Predicting
4. Making a hypothesis
5. Experimenting
6. Measuring
7. Communicating
8. Making an inference
9. Constant
10. Interpreting data
Explanation:
Hope this helps!!
hope it is helpful to you
Sound waves vibrate your eardrum, which moves bones in your middle
ear. The soundwaves then pass through a fluid in your inner ear, and on to
tiny hairs that send signals to the brain.
A. True
B. False
Answer: A. True
Explanation:
I need help with this pls help
Answer: true
Explanation:
Which of the following has the highest pH?
A. 1 M HCl
B. 0.01 M HCl
C. 0.1 M HCl
D. 0.001 M HCl
Answer: D
Explanation: pH = - log( c). If c= 1.0 M. PH = 0, if c=0.001 M. PH = 3
Answer:b
Explanation:
ik
Which element's properties form the basis for all life?
Answer:
carbon
Explanation:
The properties of carbon forms the basis for all life. Explanation: The atoms of carbon are found in the molecules of all living species.
A beaker contains 5.78 ml of water what is the volume in gallons
Answer:
[tex]0.00153\ \text{gallons}[/tex]
Explanation:
[tex]1\ \text{milliliter}=0.000264172\ \text{gallons}[/tex]
The given volume of water is [tex]5.78\ \text{milliliters}[/tex]. So,
[tex]5.78\ \text{milliliters}=(5.78\times 0.000264172)\ \text{gallons}[/tex]
[tex]=0.00153\ \text{gallons}[/tex]
The volume of the given water in gallons is [tex]0.00153\ \text{gallons}[/tex].
HELP!!!! ILL GIVE THE CROWN THINGY THING!!!!!!!!!! DUE SOON!!!!!!!!! PLS HELP!!!!!!!!!!
Why must many of the telescopes that detect invisible wave, such as infrared, microwaves, and gamma rays, be placed in space?
a Most radiation reaching Earth from space is blocked by the atmosphere. Therefore, some telescopes must be placed above the atmosphere.
b There are not enough places on land to build observatories that hold large telescopes.
c All telescopes must be placed in space. There are not telescopes on land.
d The waves in the electromagnetic spectrum are all too small to be detected by telescopes on land. Therefore, in order to see any EM radiation, telescopes must be placed in space.
Answer: A. Most radiation reaching Earth from space is blocked by the atmosphere. Therefore, some telescopes must be placed above the atmosphere.
Explanation: Astronomers have a huge problem detecting radiation from space because the Earth's atmosphere blocks most of it and stops it from reaching the surface.
Hope this helps :)
A 1.00 L sample of gas at 760 torr is compressed to 0.800 L at constant
temperature. Calculate the final pressure of the gas.
Answer:
950 torr
Explanation:
Step 1: Given data
Initial volume of the gas (V₁): 1.00 LInitial pressure of the gas (P₁): 760 torrFinal volume of the gas (V₂): 0.800 LFinal pressure of the gas (P₂): ?Step 2: Calculate the final pressure of the gas
If we assume ideal behavior and constant temperature, we can calculate the final pressure of the gas using Boyle's law.
P₁ × V₁ = P₂ × V₂
P₂ = P₁ × V₁/V₂
P₂ = 760 torr × 1.00 L/0.800 L = 950 torr
Is this statement true or false?
Gymnosperms reproduce using seeds, but angiosperms do not.
Answer:
FALSE!
Explanation:
Gymnosperms do use seeds but are exposed like the pine cones of pines. Angiosperms still have seeds, however, they flower or fruit.
Answer:
False
Explanation:
Question 7 (1 point)
A sample of a gas has a pressure of 0.895 bar when the volume is 318 L. What is the
pressure of the gas when the volume is 125 L?
Answer:
2.28bar
Explanation: Boyle's law P1V1=P2V2 manipulate formula in favor of V2 the new formula should beP1V1/V2
0.895*318/125=2.2768 but to same sigfig it is 2.28
What is the delta H fusion used to calculate volume of a liquid frozen that produces 1 kg of energy?
Answer:
The correct option is C. 1 kJ x 1/ΔHfus x g/mol x ml/g liquid
Explanation:
The change in enthalpy of fusion (ΔHfus) has units of energy divided into moles of substance:
ΔHfus = energy/mol of substance = J/mol or KJ/mol
Thus, we multiply the kJ of energy produced by the inverse of ΔHfus (in kJ/mol) we obtain the moles of substance:
energy (kJ) x 1/ΔHfus (mol/kJ) = moles of substance(mol)
Then, if we multiply the moles of substance by the molecular weight of the substance (in g/mol) we obtain the grams:
moles of substance(mol) x molecular weight (g/mol) = grams of substance (g)
Finally, if we multiply the grams of substance (in g) by the density of the substance (in g/ml) we obtain the volume (in ml):
grams of substance (g) x 1/density (ml/g) = volume (ml)
We combine all these parts to obtain the equation for the volume required to produce 1 kJ of energy:
energy (kJ) x 1/ΔHfus (mol/kJ) x molecular weight (g/mol) x 1/density (ml/g)
Therefore, the correct option is:
C → 1 kJ x 1/ΔHfus x g/mol x ml/g liquid
1 kJ x 1/ΔHfus x g/mol x ml/g liquid
A chlorine concentration of 0.500 ppm is desired for water purification. What
mass of chlorine must be added to 2500 L of water to achieve this level?
Answer:
1.25 grams of chlorine.
Explanation:
Hello there!
In this case, since it is possible to define the parts per million of chlorine as the milligrams of chlorine per liters of water, in order to obtain the mass of chlorine in 2500 L, we proceed as follows:
[tex]ppm=\frac{mg}{L}\\\\mg=ppm*L[/tex]
In such a way, we plug in the given 0.500 ppm and 2500 L to obtain (in grams):
[tex]mg=0.500mg/L*2500L\\\\g=1250mg*\frac{1g}{1000mg}\\\\ g=1.25g[/tex]
Best regards!
What is the total number of oxygen atoms on the left-hand side of this chemical equation?
2 Caz(PO4),(s)+48i0,(s) +12C(s) - 4 Casio2(3)+P4($)+12CO(g)
Answer:
Is the answer eight atoms
NO GO*GLE ANSWERS PLEASE!
Tyrel is learning about a certain kind of metal used to make satellites. He learns that infrared light is absorbed by the metal, X-ray light is transmitted through the material, and visible light is reflected off the metal. Tyrel wonders if the metal will get warm if he shines the lights on it.
Answer:
Tyrel is learning about a certain kind of metal used to make satellites. He learns that infrared light is absorbed by the metal. X-ray light is transmitted through the metal. ... Yes, light can cause the metal to get warm because light carries energy.
what is melting point
Answer:
it's a temperature where a solid will melt
1. What is the relationship between a DNA molecule, a gene and a protein?
Explanation:
for example, one gene will code for the protein insulin, which is important role in helping your body to control the amount of sugar in your blood. Genes are the basic unit of genetics. Human beings have 20,000 to 25,000 genes.