1. What is the molar mass of Al2S3?

Answer:

d hope it's right hope this helps

Answer:

Energy exists in a field.

Explanation:

Electrical field, magnetic field, and gravitational field.

A and B are wrong otherwise the law of conservation of energy would be violated

Answer:

Very dense.

Explanation:

Conceptually, you are taking a large amount of atoms and putting them into a small container.  This means the spaces between atoms has to be smaller and the substance is more dense. (see image)

Mathematically, the equation for density is mass divided by volume ([tex]Density=\frac{m}{v}[/tex] ). If you divide a big number by a small number, you still have  a pretty big number (ex 4/2=2 versus 6/1=6)

Answer:

This is because molecules in a solid are packed against each other. When a vibration begins, the molecules of a solid immediately collide and the compression wave travels rapidly.

Explanation:

Answer:

Explanation:

C

The limiting reactant in this reaction is Fe. 4 moles of Fe gives 2 moles of ferric oxide. Hence, 13 moles of Fe will give 6.5 moles of iron (iii)oxide.

The reactant which is not sufficient in amount determines the yield of the reaction and it is called the limiting reactant of the reaction.

In the given reaction, 4 moles of iron reacts with 3 moles of oxygen to give 2 moles of iron oxide.

given , no.of moles of oxygen gas present  in the sample = 21 moles

no.of moles of Fe = 13 moles.

Here, 28 moles of Fe is needed to react with 21 moles of oxygen. Hence, Fe is the limiting reactant.

4 moles of Fe gives 2 moles of iron (III)oxide. Hence, number of moles of the product , formed from 13 moles of Fe is calculated as follows:

(13 moles  ×2 moles)/4moles = 6.5m moles

Therefore, 6.5 moles of iron (III)oxide is formed from 13 moles of Fe.

Find more on limiting reactant :

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Answer:

See explanation

Explanation:

A positron is also called a positive electron. It results from the transformation of a proton into a neutron.

When a nucleus decays by positron emission, the atomic mass of both the parent and daughter nuclei remain the same but the atomic number of the daughter nucleus decreases by 1 compared to that of the parent nucleus. The daughter nucleus is now found one place to the left of the parent nucleus in the periodic table.

This leads to an increase in the Neutron/Proton ratio.

Answer:

6.576 g NaCl

Explanation:

2Na + Cl2 --> 2 NaCl

Step 1: Find out moles of Na and Cl to determine the limiting reactant:

moles Na = 12/23 = 0.52 moles Na

moles Cl2 = 16/71=0.225 moles Cl2

ratio Na:Cl is 2.3:1 so Cl is the limiting reactant.

Step 2: How many moles of NaCl are formed:

moles NaCl = moles Cl2 x (1 mol NaCl/2 moles Cl2) = 0.225/2 = 0.1125 moles NaCl

Step 3:

mass NaCl = moles NaCl x MM NaCl = 0.1125 x 58.45 = 6.576 g NaCl

Answer:

See explanation below

Explanation:

In this case we have reaction of addition. In this case a diene reacting with an acid as HBr. This reaction is known as Hydrohalogenation, and, as we have a diene, this kind of reaction can be done as 1,4 addition. Which means that the reaction will be undergoing with an adition in the carbon 1, and carbon 4.

At room temperature we can expect that this reaction can be done in thermodynamic conditions, Now, as the problem states that is forming 4 products, we can expect products of a 1,2 addition too. This product can be formed if the reaction is taking place in the most stable carbocation, and then, by resonance, we can expect the 1,4 product too.

Now, the HBr can be attacked by the double bond of the first position, giving two possible products or by the double bond of the third position giving the other two products. These products are all possible, obviously the most stable will be the major of all of them, but the other three are perfectly possible. One product is formed without doing much, and the other by resonance. Same happens with the other double bond.

In the picture below, you have the mechanism for all the 4 products.

Hope this helps

Answer:

atoms

Explanation:

i hope that help you

Answer:

atoms

Explanation:

Answer:the first one is D second one is A and the third one is A   :D

Explanation:

Answer: D

Explanation:

Cause If you head to the middle of the ocean and dive down, down, down to where the Earth's plates meet, you might find an undersea mountain split by a deep trench. It's called a mid-ocean ridge. Up through such trenches, brand-new molten rock is bubbling. That's the newest rock on Earth! How does the ocean floor make room for all that new rock? Simply by pushing the old rock aside. In fact, the ocean floor is actually spreading right at this minute, out away from the deep trenches where new rock is being formed. The oldest rock can be found farthest away from the trenches, right up near the continents. It's all part of a process called seafloor spreading. It's been going on for millions of years (at the rate of a few centimeters per year), but scientists are just now getting to know more about it. In fact, because evidence of seafloor spreading was first discovered in the 1940s and 50s, your great-grandparents may have never heard of it!

Answer: Decrease in size

Explanation:

Electronegativity is defined as the property of an element to attract a shared pair of electron towards itself.

On moving across a period from left to right,   the size of an atom decreases because the electrons get added to the same shell and the nuclear charge keeps on increasing. Thus the electrons get more tightly held by the nucleus.

As, the size of an element decreases, the valence electrons come near to the nucleus. So, the attraction between the nucleus and the shared pair of electrons increases. Thus electronegativity increases.

Answer:

I think Water is carried to the leaves by xylem.

Answer:

d

Explanation:

Answer:

Absolute error in measurement of A = 0.3

Absolute error in measurement of B = 0.3

Explanation:

Absolute error is a measure of the amount of error in a measurement i.e. a measure of how far away a measurement is from a true value or an indication of the uncertainty in a measurement.

The Absolute Error is the difference between the actual and measured value. In formula, the absolute error, Δx is given as:

Δx = |xi – x|,

Where:  xi is the measurement, x is the true value,

| | indicates that only absolute values are taken

In the measurements by the student in the question:

Metal Cylinder A

measured value = 12.4 grams

actual mass of metal cylinder A = 12.7 g

Using the absolute error formula; Δx = |xi – x|

Absolute error in measurement of A = |12.4 - 12.7| = 0.3

Metal Cylinder B

measured value = 75.4 grams

actual mass of metal cylinder B = 75.1 g

Using the absolute error formula; Δx = |xi – x|

Absolute error in measurement of B = |75.4 - 75.1| = 0.3

Answer:

Moles to grams carbon dioxide

1 mole is equal to 1 moles Carbon Dioxide, or 44.0095 grams.

Explanation:

Moles to grams carbon dioxide

1 mole is equal to 1 moles Carbon Dioxide, or 44.0095 grams.

Answer:

88%

Explanation:

Step 1: Write the balanced equation

C₆H₁₁OH ⇒ C₆H₁₀ + H₂O

Step 2: Calculate the moles corresponding to 4.1 g of C₆H₁₁OH

The molar mass of C₆H₁₁OH is 100.16 g/mol.

4.1 g × 1 mol/100.16 g = 0.041 mol

Step 3: Calculate the theoretical yield, in moles, of C₆H₁₀

The molar ratio of C₆H₁₁OH to C₆H₁₀ is 1:1. The theoretical yield of C₆H₁₀, in moles, is 1/1 × 0.041 mol = 0.041 mol.

Step 4: Calculate the mass corresponding to 0.041 moles of C₆H₁₀

The molar mass of C₆H₁₀ is 82.14 g/mol.

0.041 mol × 82.14 g/mol = 3.4 g

Step 5: Calculate the percent yield of C₆H₁₀

We will use the following expression.

percent yield = experimental yield/theoretical yield × 100%

percent yield = 3.0 g/3.4 g × 100% = 88%

Answer:

4.5472g/ml rounded of to 4 s.f

Explanation:

Density= Mass/ Volume

Answer:

Relative organisms

Explanation:

Ecology is a branch of biology that deals with the relations of organisms to one another and to their physical surroundings and conditions.

hope this helps:)

Answer:

0.378 g of H₂₂O can be produced.

Explanation:

The combustion reaction is:

2CH₃(CH₂)₂CH₃  +  13O₂  →  8CO₂  +  10H₂O

We convert the mass of reactants to moles:

0.58 g . 1mol / 58.1g = 0.00998 moles of butane

0.874 g . 1mol / 32g = 0.0273 moles of O₂

Oxygen is the limiting reactant. Look at stoichiometry.

2 moles of butane need 13 moles of oxygen to react

Then, 0.00998 moles of gas may react to (0.00998 . 13) / 2 = 0.06487 moles of oyxgen. I only have 0.0273 moles, so i do not have enough oxygen to complete the reaction.

Let's find out the product.

13 moles of oyxgen can produce 10 moles of water.

Then 0.0273 moles of O₂ may produce (0.0273 . 10)/13 =  0.021 moles

We convert to mass  →  0.021 mol . 18g /1mol = 0.378 g

Answer:

The core turns its hydrogen to helium and stops nuclear fusion which causes the outer shells of hydrogen to collapse.

Explanation:

This results in higher temperature and pressure which in turn causes the outer shells to expand and cool as a red giant.

Answer:

The system releases energy to the environment, because its internal energy decreases.

The entropy of the surroundings increases (AS surr > 0) because the surroundings absorb heat released by the reaction, and become more disordered.

The entropy of the system decreases (AS sys < 0) because the closure of the ring reduces the number of conformations the ring can adopt.

The enthalpy or internal energy of the system decreases (AH sys < 0) because the electrons that form the bond enter an orbital that is at a lower energy.

Explanation:

Now we know that when a reaction is exothermic heat is given off. In this case, we have a reaction that connects the ends of a chain of carbons to form a ring.  The bonding electrons now move into a lower energy bonding sigma molecular orbital.

This leads to a decrease in the entropy and enthalpy of the system because energy is given off, the closure of the ring reduces the number of conformations the ring can adopt and  the electrons that form the bond enter an orbital that is at a lower energy.

The entropy of the surroundings is increased as energy is given out. The surroundings absorb heat released by the reaction, and become more disordered.

The food has 23629.64 cal

Given

mass = 1000 g of water

temperature increases 23.65 * C

Required

The energy of the food

Solution

Heat absorbed by water :

Q = m . c . Δt

Q = 1000 g x 4.184 J/g°C x 23.65 °C

Q = 98951.6 J

1 Joules = 0.2388 Calories

98951.6 J = 23629.64 cal

Answer:

law of multiple proportions

Explanation:

The law of multiple proportions states that, if two elements A and B, combine to form more than one chemical compound. Then the various masses of one element A, which combine separately with a fixed mass of element B are in  simple multiple ratio.

We can see that the ratio of oxygen that combines with carbon in the two compounds( A and B) is 1:2. This demonstrates the law of multiple proportions.

The substances A and B must be CO and CO2 respectively.

Explanation:

w is the stage in which dna is copied and cell grows.

Answer:

w

Explanation:

Answer:

1 g/cm3

Explanation:

The formula for density is mass/volume

The mass is 100 g and the volume is 100 cm3

100 g/100 cm3=1 g/cm3