Given that for Fe2O3 (s) the standard enthalpy of formation is −824.2 kJ/mol and the enthalpy of reaction is −851.5 kJ/mol, what is the enthalpy of formation for Al2O3 (s)?

Answer:

0.13 atm

Explanation:

Using the Ideal Gas Law; PV=nRT, we can rearrange to solve for pressure.

P=nRT/V

P is pressure, n is number of moles (0.023), R is a constant (0.08206 L*atm/mol*K), T is temperature in Kelvin (293.15K) and V is volume, 4.2 L.

So, plugging in;

P=(0.023mol)(0.08206L*atm/mol*K)(293.15K)/(4.2 L)

P=0.1317 atm

P=0.13 atm; multiply by 760 to get to Torr or mmHg.

Answer:

C.) Sodium Chloride

Explanation:

Table salt is an example of an ionic compound. Sodium and chlorine ions come together to form sodium chloride or NaCl.

Answer:

first option - liquid particles gain kinetic energy and start moving faster around each other

Explanation:

this is a rising section of the graph, meaning that the state of matter is not changing but it warming up and increasing particle movement. This increase in movement is explained by the increase in kinetic energy. (when the kinetic energy rises, the movement rises)

Answer:

Balance the equation first

[tex]2H_{2} \ + \ O_{2} \ --> \ 2H_{2}O[/tex]

          6.58g of Oxygen gas

Divide 6.58g by molar mass of oxygen (32g/mol)

6.58/32 = 0.205625 mol

Use mol to mol ratio from looking at the coefficients of the reactants, the mol ratio of Hydrogen gas to Oxygen gas is 2:1, so for every 1 mol of Oxygen, you need 2 times the mol of hydrogen for it to make water.

0.205625 * 2 = 0.41125 mol

To get the mass of hydrogen gas needed in the reaction, turn 0.41125 mol into mass by multiplying it with Hydrogen gas's molar mass, which is 2.02 g/mol.

0.41125 * 2.02  ≈ 0.83g of H2

The engine displacement in cubic nanometer (nm³) is 8.785×10²⁴ nm³

1 in³ = 1.639×10²² nm³

With the above convesion scale we can obtain the displacement in nm³

1 in³ = 1.639×10²² nm³

Therefore,

536 in³ = 536 × 1.639×10²²

536 in³ = 8.785×10²⁴ nm³

Thus, the displacement in nm³ is 8.785×10²⁴ nm³

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Answer:

Vanadium in given compound is metal and oxygen is non-metal so, the given compound is a binary ionic compound.

Answer:

First filter the the un-soluble solute out of the solution

Then get the solute and put it on an evaporating dish to form salt crystals

Explanation:

We have that the value of Ki for the inhibited reaction

a)

Generally, if the fee of Vmax binds, the place the enzyme inhibitor binds solely to the complicated fashioned between the enzyme and the substrate.

b) V diminished through 70%

Thereofore

Alternate = 1 - 0.7 = 0.3V

Hence

0.3 =1/ ( 1 + [I]/KI)

1= 0.3(1 + 0.657/KI )

0.3 + 0.1971KI = 1

KI = 3.551mM

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Explanation:

water can be separated from salt solution by simple distillation. This method works because water has a much lower boiling point than salt. When the solution is heated, the water evaporates. It is then cooled and condensed into a separate container.

Explanation:

Consider that strong bases are strong nucleophiles, and thus unstable with the negative charge associated with dissociation from the molecule. Hence, strong bases are generally very poor leaving groups, but can be converted into good leaving groups that are more stable with the associated negative charge.

Answer:

Carbon Dioxide

Explanation:

This is a covalent compound so to name it you have one carbon, no prefix needed, & 2 oxygen the prefix for 2 is Di-.

Answer: Ocean currents act as conveyer belts of warm and cold water, sending heat toward the polar regions and helping tropical areas cool off

Explanation: Hope this helps? Brainliest if it helped

Answer:

c-d

Explanation:

this is a section of the graph sloping down, meaning the state of matter isn't changing but is getting ready too (the actually changing of states happens in the flat sections). A-B is the gas cooling, b-c is the gas changing into liquid, which leads to the liquid cooling in the next section

Answer: You need approximately 70 g of potassium carbonate.

Explanation:

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Answer:

number 2 becaus 1 and 3 look simler.

Explanation:

Answer:

because there are other particles to help it move around in the air

The percent composition of water will be 15%

The percent composition of a component of a compound is found by dividing the mass of the component by the mass of the compound.

In other words:

Percent composition = mass of component/mass of substance x 100

In this case, the formula for barium chloride dihydrate is [tex]BaCl_2.H_4O_2[/tex]

The molar mass of the compound is 244.26 g/mol

The molar mass of the water component is 18 x 2 = 36 g/mol

Thus, the percent composition of water in the compound can be found, such that:

Percent composition of water = 36/244.26 x 100

                                      = 15% to the nearest whole number.

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Answer:

100 / 500

Explanation:

100 / 500 is equivalent to 1 / 5.

Explanation:

a. much smaller mass and oppisite charge.

Answer:

4.5moles

Explanation:

2.25moles times 2 hydrogen atoms per one molecule

The number of hydrogen atoms present in 2.25 moles of hydrogen carbonate is 4.5.

A mole of a compound is equivalent to the one formula unit of the compound. The number of atoms of each element in a mole of the compound can be given from the formula unit.

1 unit of hydrogen carbonate consists of 2 atoms of hydrogen. Thus, 1 mole of hydrogen carbonate has 2 hydrogen atoms.

The number of hydrogen atoms in 2.25 mole of hydrogen carbonate can be given as:

[tex]\rm 1\;mol\;H_2CO_3=2\;atoms\;Hydrogen\\2.25\;mol\;H_2CO_3=2.25\;\times\;2\;atoms\;of\;hydrogen\\2.25\;mol\;H_2CO_3=4.5\;atoms \;of\;Hydrogen[/tex]

The number of hydrogen atoms present in 2.25 moles of hydrogen carbonate is 4.5.

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Answer:

[tex]keq=\frac{[NH_{3} ]^2}{[N_{2} ][H_{2} ]^3}[/tex]

Explanation:

Answer:

The combined weights of several liquids mixed in an open flask be less than the sum of all the weights of the liquids because when the reaction occurs new products are formed and also some gases which releases in the atmosphere.

The total pressure of gases is equivalent to 739mmH divided by the area.

To calculate the total pressure of gases, the next formula can be used:

The area of a cylinder is equal to 2πrh+2πr².

You can know the radio by checking the measurement of the base of the graduated cylinder. Also, you can determine the height by observing how many mm the gas is occupying. Then follow these steps:

Note: This question is incomplete because the height occupied by the gas and the radio of the cylinder are not provided. Due to this, I answered this question based on general knowledge.

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Answer:

The Changes I see is the Hot glass have less air bubbles than the Cold Glass. The Cold Glass has more air bubbles than the Hot Glass.

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I Gallon = 3.785 L 1 Mg = 1 mg gallon 3.785L. 3. The recommended adult dose of Elixophyllin®, a drug used to treat asthma, is 6.00 mg/kg of body mass. Calculate the dose in milligrams for a 112 lb person. (o oo Kg | K9 6.oong 112 15 = 3 04.7 - 3 2.20515 2.20516 my k.

Hope this answer will help you.

Answer:

Multiply 0.0543 L by a 1000 to get to mL, move the decimal point 3 times to the right, and you get 54.3 mL

Answer:

0.07mol

Explanation:

n=mass/molar mass

Answer:

emi should put it in a metal container and place directly to the sun emi should place two mirrors opposite it and that will increase the heat which will melt the Marsh mallow