When 1 mol of methane is burned at constant pressure, −890 kJ/mol of energy is released as heat. If a 1.67 g sample of methane is burned at constant pressure, what will be the value of ∆H
Answer:
[tex]\Delta H=-92.7kJ[/tex]
Explanation:
Hello there!
In this case, according to the given information, we can infer that 890 kJ of energy are released when 1 mole of methane is burned; however, to find the total heat when 1.67 grams are burned, we first need to calculate the moles in this mass of methane:
[tex]1.67gCH_4*\frac{1molCH_4}{16.04gCH_4}=0.104molCH_4[/tex]
And thus, for calculating the resulting ∆H, we proceed as follows:
[tex]\Delta H=-890kJ/mol*0.104mol\\\\\Delta H=-92.7kJ[/tex]
Regards!
Which of the following phase changes describes what is
happening in the following endothermic process?
H20 (1) + heat --> H2O (g)
O melting
o freezing
o boiling
O condensing
Answer:
I think the answer is boiling
Which of the following best describes asexual reproduction?
it produces offspring with a large amount of genetic variation
it occurs in simple organisms, such as bacteria, but not in multicellular organism such as plants and animals
it allows species to quickly adapt to environmental changes
it can be an advantage to organisms that live in a stable unchanging environment
Answer:
First Choice
it produces offspring with a large amount of genetic variation
Answer: i think this is correct.
Explanation: it occurs in simple organisms, such as bacteria, but not in multicellular organism such as plants and animals
17. A scientist determines an unknown metallic sample to have 77 protons and 77 electrons with a mass number of 192. How many neutrons does one
metal atom contain?
Answer:
Ok so hot u hahaha
Explanation:
Hshshhdhdi jsushshshshshhdhdhd hshshshshsh hdhdhdhd hdhdhdhd hdhdh
The theory of plate tectonics is supported by data collected by scientists. One piece of data includes that earthquakes tend to occur*
a.along plate boundaries
b.along mountain ranges
c.along the banks of rivers
d.along the boundaries of glaciers
Answer:
is that a letter a
Explanation:
that is my answer
How many liters of F2 do you have if you are given 100 grams of F2?
Why study science?
Lmk ASAP
REALIZAR LA MASA MOLECULAR DE LOS SIGUIENTES COMPUESTOS HIDROXIDO DE MAGNESIO = Mg(OH)2 ACIDO CARBONICO = H2CO3 GLUCOSA= C6H12O6
Answer:
Mg(OH)2 = 58.321g/mol
H2CO3 = 62.026g/mol
C6H12O6 = 180.156g/mol
Explanation:
Para hallar la masa molecular debemos, primero, identificar las moles de cada átomo presentes en una mol de una molécula. Por ejemplo, para el hidróxido de magnesio:
Mg = 1mol
O = 2mol
H = 2mol
Ahora, debemos hacer la suma del peso molecular de todos estos átomos. Esto es:
Mg = 1mol * (24.305g/mol) = 24.305g/mol
O = 2mol * (16g/mol) = 32g/mol
H = 2mol* (1.008g/mol) = 2.016g/mol
El peso molecular del hidróxido de magnesio es:
24.305g/mol + 32g/mol + 2.016g/mol = 58.321g/mol
Ácido Carbónico:
H = 2mol * (1.008g/mol) = 2.016g/mol
C = 1mol * (12.01g/mol) = 12.01g/mol
O = 3mol * (16g/mol) = 48g/mol
Masa molar = 62.026g/mol
Glucosa:
C = 6mol * (12.01g/mol) = 72.06g/mol
H = 12mol * (1.008g/mol) = 12.096g/mol
O = 6mol * (16g/mol) = 96g/mol
Masa molar = 180.156g/mol
How many representative particles are there in 10.43g of sugar (C12H22011)?
Answer:
10.43 / 342 × 6.02 × 10 ^23 = 18.34 × 10^ 21
1. Predict what will happen when the plastic bag is let go.
Answer:
If its windy it will fly away. If its not windy I think it will float down to the ground
Explanation:
The Himalayan mountain range of India was formed at a ____.
A) convergent boundary
B) divergent boundary
C) hot spot
D) transform boundary
Answer:
its answer is b
Explanation:
divergent boundary
Please help me I will give brainliest to the first correct answer
Answer:
OPTIC B) HEPT-HOPE IT IS HELPFUL
Study the particle below carefully and answer
the questions that followed.
a)ldentify the particle.
b)Write the electronic configuration of the
particle.
c)State
i.Atomic number
ii.Mass number
iii.Proton number
iv.Electron number
d) Calculate the neutron number
e) State the valency
f)What is the valence electrons?
Answer:
b is the answer hope that helps
please mark all that apply!
Answer:
F G there you go the guy on top is right
Explanation:
F G
a gas with a volume of 20.0l at a pressure of 275 kpa is allowed to expand to a volume of 35.0l. what is the pressure in the container if the temperature remains constant?
1. 2.54 kPa
2. 157 kPa
3. 481 kPa
pls help ;(
Answer:
[tex]\boxed {\boxed {\sf 2. \ 157 \ kPa}}[/tex]
Explanation:
Since temperature remains constant, the only variables that change are volume and pressure. Therefore, we are using Boyle's Law. This states that the pressure is inversely proportional to the volume. The formula is:
[tex]P_1V_1=P_2V_2[/tex]
We know the gas starts with a volume of 20.0 liters at a pressure of 275 kPa. We can substitute these values into the left side of the formula.
[tex]275 \ kPa *20.0 \ L=P_2V_2[/tex]
We know the gas expands to a volume of 35.0 Liters, but we do not know the pressure.
[tex]275 \ kPa *20.0 \ L=P_2* 35.0 \ L[/tex]
Since we are solving for the new pressure, we must isolate the variable P₂. It is being multiplied by 35.0 Liters and the inverse of multiplication is division. Divide both sides by 35.0 L.
[tex]\frac {275 \ kPa * 20.0 \ L}{ 35.0 \ L}= \frac{P_2*35.0 \ L}{35.0 \ L}[/tex]
[tex]\frac {275 \ kPa * 20.0 \ L}{ 35.0 \ L}=P_2[/tex]
The units of liters cancel.
[tex]\frac {275 \ kPa * 20.0 }{ 35.0 }=P_2[/tex]
[tex]\frac {5500}{35.0} \ kPa= P_2[/tex]
[tex]157.142857 \ kPa=P_2[/tex]
The original measurements of pressure and volume have 3 significant figures, so our answer must have the same. For the number we calculated, that is the ones place.
The 1 in the tenths place (157.142857) tells us to leave the 7 in the ones place.
[tex]157 \ kPa= P_2[/tex]
If the gas expanded to a volume of 35.0 liters while the temperature remained constant, the pressure in container was approximately 157 kilopascals.
ANSWER THIS QUESTION FOR 29 POINTS
List several examples of what cells do all day?
I NEED HELP HELP ASAP
Answer:
Explanation:
cells process rna and trna
converting food into energy
the regrowth of cells that have died through out the day
the transcription of dna to rna
hope this helped :)
A container of oxygen gas is at STP. If this sample is put into an oven at 280 C, what would its pressure be, in atmospheres?
Explanation:
Step 1:
Data obtained from the question. This include the following:
Initial pressure (P1) = 1atm
Initial temperature (T1) = 0°C = 0°C + 273 = 273K
Final temperature (T2) = 280°C = 280°C + 273 = 553K
Final pressure (P2) =...?
Step 2:
Determination of the new pressure of the gas.
Since the volume of the gas is constant, the following equation:
P1/T1 = P2/T2
will be used to obtain the pressure. This is illustrated below:
P1/T1 = P2/T2
1/273 = P2 / 553
Cross multiply
273x P2 = 553
Divide both side by 273
P2 = 553/273
P2 = 2.03atm
Therefore, the new pressure of the gas will be 2.03atm
Answer:
[tex]\boxed {\boxed {\sf P_2=2.03 \ atm}}[/tex]
Explanation:
We are concerned with the variables of temperature and pressure, so we use Gay-Lussac's Law, which states the temperature of a gas is directly proportional to the pressure. The formula is:
[tex]\frac{P_1}{T_1}=\frac{P_2}{T_2}[/tex]
We know that the container of gas begins at standard temperature and pressure (STP). This is 1 atmosphere of pressure and 273 Kelvin.
[tex]\frac { 1 \ atm}{ 273 \ K} = \frac{P_2}{T_2}[/tex]
We know the gas is put into an oven at 280 degrees Celsius. We can convert this to Kelvin.
K= °C + 273.15 K= 280 +273.15K= 553.15[tex]\frac { 1 \ atm}{ 273 \ K} = \frac{P_2}{553.15 \ K}[/tex]
We are solving for the new pressure, so we must isolate the variable P₂. It is being divided by 553.15 Kelvin. The inverse of division is multiplication, so we multiply both sides by 553.15 K
[tex]553.15 \ K *\frac { 1 \ atm}{ 273 \ K} = \frac{P_2}{553.15 \ K} * 553.15 \ K[/tex]
[tex]553.15 \ K *\frac { 1 \ atm}{ 273 \ K}= P_2[/tex]
The units of Kelvin cancel.
[tex]553.15 *\frac { 1 \ atm}{ 273 }= P_2[/tex]
[tex]2.02619047619 \ atm = P_2[/tex]
Rounded to the nearest hundredth:
[tex]2.03 \ atm \approx P_2[/tex]
The new pressure is approximately 2.03 atmospheres.
PLEASE ANSWER!!!!!!!!!!!!!
What are three advantages of renewable energy?
Tritium (hydrogen-3) has a half-life of 12.3 years. How old is a bottle of wine if the tritium content is determined to be 25% in new bottle of wine
Answer:
24.6 years
Explanation:
Applying,
A = (A')[tex]2^{a/n}[/tex]..................... Equation 1
Where A = Original Tritium content in the wine, A' = Tritium content in the wine after decay, a = age of the old bottle, n = half life of Tritium
From the question,
Let A = X, therefore, A' = 0.25X
Given: n = 12.3 years
Substitute these values into equation 1
X = 0.25X([tex]2^{a/n}[/tex])
1 = 0.25×([tex]2^{a/12.3}[/tex])
1/0.25 =
4 = [tex]2^{a/12.3}[/tex]
[tex]2^{a/12.3}[/tex] = 2²
Equation the base,
a/12.3 = 2
a = 12.3×2
a = 24.6 years
Write a quick summary about what we learned about Radioactive Decay. Be sure to include: 1). Structrue of an atom's nucleus 2). Three Types of radioactive decay and what happens with them.
Answer:
Radioactive decay refers to the release of radiation from the nuclei.
Explanation:
Radioactive decay also known as nuclear decay is a type of process in which an unstable atomic nucleus loses energy by radiation. Alpha decay, beta decay, and gamma decay are the three of the most common types of decay, which emitting one or more particles or photons from the unstable nuclei of radioactive atom. Beta decay occurs due to weak force, while the alpha and gamma decay happens due to electromagnetic and strong forces.
what is the variable for the quantity of heat in a system?
Answer:
The heat capacity is the amount of heat, expressed usually in Joules or calories, needed to change the system by 1 degree Celsius. The specific heat capacity is the amount of heat required to raise 1 gram of a substance by 1 degree Celsius.
Explanation:
For example, the specific heat of H2O(l) is 4.18 J/g ° C.
HELP PLEASE I DONT KNOW WHAT THIS MEANS IM CONFUSED
Explanation:
In an alpha emission, an alpha particle is ejected from a large nucleus. An alpha particle is simply a helium nucleus (atomic number is 2 and mass number is 4) so that means that the atomic number of the emitting nucleus decreases by 2 and its mass number decreases by 4.
A Starting substance in a chemical reaction is called a _______________.
1. reactant
2. product
3. chemical reaction
4. physical reaction
Answer:
1.)REACTANT
These starting substances of a chemical reaction are called the reactants, and the new substances that result are called the products.4.
The relationship between how much mass matter has in a given volume is called
A. density
O
B. boiling point
C. melting point
O
D. weight
[tex]\huge{ \mathrm{ \underline{ Answer }\: \: ✓ }}[/tex]
The relationship between mass of matter per unit volume is known as :
[tex] \large \boxed{ \mathrm{density}}[/tex]
_____________________________
[tex]\mathrm{ ☠ \: TeeNForeveR \:☠ }[/tex]
Write a chemical equation for the following reaction. (Type your answer using format CH4 for CH4.) In water, iron(III) chloride reacts with sodium hydroxide, producing solid iron(III) hydroxide and sodium chloride.
Answer:
FeCl3(aq) -
3NaOH(aq) 0 Fe(OH)3(s) -
3NaCl(aq)
Explanation:
FeCl3(aq) -
3NaOH(aq) 0 Fe(OH)3(s) -
3NaCl(aq)
Please help me on this question
fuerza que ejerce el planeta tierra sobre los cuerpos que en ella se encuentran. Fuerza de distancia Fuerza de Contacto
Answer:
Ver explicacion
Explanation:
La gravedad es una fuerza que actúa a distancia. La fuerza que actúa entre la tierra y los cuerpos en ella es la fuerza gravitacional.
Es un ejemplo típico de una fuerza de acción a distancia.
Por lo tanto, la fuerza tat que existe entre la tierra y los cuerpos que se encuentran en ella es una fuerza de distancia.
To calculate the work that an object does when it moves covering a distance of 3000 meters when it is propelled by a force of 65 Newton, one of the principles of mechanics must be considered.
Physical principle of mechanicsA force does work when there is a displacement of the center of mass of the body on which the force is applied, in the direction of said force.
The work of the force on that body will be equivalent to the energy necessary to displace it, so that:
W = F.d
Force CalculationSubstituting the corresponding values in said formula:
F = 65N
d = 3000m
W = 65 N. 3000 m
W = 195000 W
Learn more about force calculations at https://brainly.com/question/23775339 #SPJ4
What is a zirconium, in your own words but be more detailed.What is a zirconium, in your own words but be more detailed.
Answer:
Zirconium is a silver-gray transition metal, a type of element that is malleable and ductile and easily forms stable compounds. It is also highly resistant to corrosion. It is commonly used in corrosive environments. Zirconium alloys can be found in pipes, fittings, and heat exchangers, according to Chemicool.
Explanation:
Answer: Today this element is widely used, as zircon, as Zirconium oxide and as the metal itself. Zirconium is to be found in ceramics, foundry equipment, glass, chemicals, and metal alloys. Zircon sand is used for heat-resistant linings for furnaces, for giant ladles for molten metal, and to make foundry moulds.
Explanation: Hope it help I think
How many moles are in a 28.35 g sample of CaCO3?
Answer:
0.2832 moles
Explanation:
mole = mass/ molar mass
mole= 28.35/100.08
mole=0.2832