SnO2 + 2H2Sn + 2H2O
If you form 42.5g of H2O from the above reaction, how many moles of H2 were present at
the start of the reaction

Answer:

7.5mols of S

Explanation:

just make sure your equation is balanced, and in this case it's balanced,

so now you can do more to more ratio.

so in this case we are dealing with SO2 and S.

According to our balanced equation we have 1 mol of SO2 producing 3mols of S, i.e

1mol(SO2). : 3mols(S)

we've been asked that if we use 2.5 moles of SO2, how many moles of S will be produced?

So, this is how we can determine the number of moles of S that will be produced .

SO2 : S

1mol : 3mols(S)

2.5mols: x

we cross multiply

x=2.5×3

x=7.5mols of S.

.: if we use 2.5 mols of SO2,, 7.5mols of Sulfur will be produced

Answer:

boiling point and melting point

Explanation:

the difference of the boiling point and the condensation temperature

Answer:

I know its not Oxygen (O2) because we need that gas to breath if not more of that gas! and i know its not helium because it is not very toxic and not a crisis in the world

Your answers are going to be B. and D.

have a nice day!

Assuming the quantity of current passing through the zinc and copper electrolytes is the same, mass of Zinc deposited is (x/64) × 65.0 g.

Electrolysis is the decomposition of a substance known as an electrolyte when electric current is passed through its solution or molten form.

The mass of an electrolyte deposited when current is passed is dependent on the current and the charge on the ion.

In the electrolysis of copper and zinc, assuming the quantity of current passed through their solution are the same, the moles of each zinc and copper deposited will be the same since the charges on their ions are the same.

Assuming x g of copper is deposited.

molar mass of copper = 64.0 g

molar mass of Zinc = 65.0 g

moles of copper deposited = x/64

moles of zinc deposited = x/64

mass of Zinc deposited = (x/64) × 65.0 g

Therefore, the mass of Zinc deposited is (x/64) × 65.0 g.

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Answer:

1.48×10²⁴ Cu atoms

Explanation:

For this question you need to use Avogadro's number 6.022×10²³atoms.

2.45 moles of Cu ×[tex]\frac{6.022x10x^{23} atoms }{1 mole}[/tex]= 1.47539×10²⁴ atoms.

The moles cancel out so you are left with atoms.

Since there are 3 significant figures in the question there should be 3 significant figures in your answer, which is 1.48×10²⁴ Cu atoms.

17.93 grams of oxygen gas occupy 12.3L of space at 109.4 kPa and 15.4°C. Details about how to calculate mass can be found below.

The mass of a given gas can be calculated by multiplying the number of moles of the substance by its molar mass.

However, the number of moles of the gas must be calculated first as follows:

PV = nRT

Where;

1.079 × 12.3 = n × 0.0821 × 288.4

13.27 = 23.68n

n = 13.27/23.68

n = 0.56mol

Mass = 0.56 × 32

mass of oxygen gas = 17.93g

Therefore, 17.93 grams of oxygen gas occupy 12.3L of space at 109.4 kPa and 15.4°C.

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Answer:

Elctromagnetic waves can travel through empty space.

Explanation:

Waves that may pass through matter or empty space are known as electromagnetic waves. The electromagnetic field, like the other basic fields, penetrates the whole universe, including the region we refer to as empty space. There are no fields in space. The medium through which electromagnetic waves travel is called the electromagnetic field.

The molecular mass of the gas if 200 mL of gas weighs 0.344 grams at STP is 38.53g/mol. Details on how to calculate molecular mass can be found below.

The molecular mass of a gas can be calculated by using the following expression:

Molecular weight of the gas = mass × volume at STP (22.4L)/ volume of gas

= 0.344 × 22.4/0.2

= 7.7056/0.2

= 38.53g/mol

Therefore, the molecular mass of the gas if 200 mL of gas weighs 0.344 grams at STP is 38.53g/mol.

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Answer:

plants animals bacteria

Answer: 1650 hope i got it in time.

Explanation:

Answer:

C

1650

Explanation:

Verified Answers With Verified Results

The equilibrium constant is the relation between the products and the reactants of the reaction. The K, for the reaction, is 172.

The equilibrium constant (K) is the relationship in the form of a ratio that denotes the concentration of the products to the reactants in a reaction.

The balanced chemical reaction is shown as,

[tex]\rm N_{2}(g) + 3H_{2}(g) \leftrightharpoons 2NH_{3}(g)[/tex]

Given,

Concentration of nitrogen =0.521 M

Concentration of hydrogen = 0.482 M

Concentration of ammonia = 3.17 M

The value of K is calculated  as:

[tex]\begin{aligned} \rm K &= \rm \dfrac{[NH_{3}]^{2}}{[N_{2}][H_{2}]^3}\\\\&= \dfrac{(3.17)^{2}}{(0.521)(0.482)^{3}}\\\\&= 172\end{aligned}[/tex]

Therefore, the equilibrium constant for the reaction is 172.

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Answer:

D

Explanation:

Answer:

It contains lonic crystals

Explanation:

Zambrano thinks that  renewable energy science is a good choice for a career it  reproduciable and eco friendly

Renewable energy science  can be defined as the study of the various types of energy that can be reproduced even after been deplited.

Examples of renewable energy is the Solar, Wind, Geothermal Enegy etc.

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This Is the sample response on edge:

There will many opportunities in the field of renewable energy science and engineering. It is an exciting field, with a lot of variety and room for new ideas.

- Have it on edge, Have a good day :)

Answer:

the blue one is f sub level in period table

Answer:

how do I answer with no question?????????????

The the strength of an electromagnet varies with the quantity and direction of current as well as the number of turns in the coil.

An electromagnet is a material which operates by the principle of electromagnetism.

Electromagnets possesses both electrical and magnetic properties.

The strength of an electromagnet is affected by the current, the number of turns as well as the material of the electromagnet.

The strength of the given electromagnet will be affected thus:

Therefore, the strength of an electromagnet is affected by current and number of turns in the coil.

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Answer:

Using a battery with a higher voltage:

✔ stronger force of attraction

Wrapping the wire around the nail only three times:

✔ weaker force of attraction

Changing the direction of the current by reversing the battery connections:

✔ no change

Using a plastic stick in place of the iron nail:

✔ weaker force of attraction

Holding the nail vertically rather than horizontally:

✔ no change

Explanation:

Did it in edge 2023 with effort

Answer:

methyl orange

Explanation:

i hope i hrlped you

the specific heat capacity is the energy needed to raise the temperature of 1kg of that substance by 1 degree

Answer:

3.) Fermentation

Explanation:

Ethanol = EtOH = C₂H₅OH

Combustion:

CH₄ + 2O₂ --> 2H₂O + CO₂

Esterification:

R-CO₂H + R-OH --> R-CO₂H-R' + H₂O

Fermentation:

C₆H₁₂O₆ --> 2C₂H₅OH + 2CO₂

Polymerization:

Hydrocarbons combining to make longer hydrocarbon chains

Answer:

c i think

Explanation:

Answer: 5

Explanation:

The amount of nickel that would be electroplated by passing a constant current of 7.2 A through a solution of NiSO₄ for 90 min is 11.83g.

Equivalent mass of any substance will be electroplated by 96485 coloumb of charge.

Equivalent mass of Ni in NiSO₄ = 58.7/2 = 29.35g

So that 96485 coloumb of charge = deposited 29.35g of Ni

Also charge will be calculated by usimg the below equation as:

Q = (I)(t), where

I = current = 7.2 ampere

t = time = 90 min = 5400 sec

Q = (7.2)(5400) = 38,880 coloumb

By using both the equations of coloumb, we calculate the grams of Ni electroplated by 38,880 coloumb charge as:

Mass of Ni = (29.35g)(38,880/96,485)

Mass = 11.826 grams = 11.83g

Hence required mass of nickle is 11.83 grams.

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Answer:

k

br-

o2- ion

Explanation:

a/k ion has a larger size than k+ ion bc of the size of the radius it is always smaller compared to the parent ion .

b/bc it is an anion and it always has a large size compared to the parent ion (the same thing as the first one)

c/both the anions are isoelectornic species .Since the nuclear charge of O2- ions is small,its size is therefore more than the F- ion

last one? don't take my word though

Explanation:

the suns heat is related to nuclear fusion

Answer:

See below

Explanation:

I do not know the 'calculation ' to find this answer....you should just look at the periodic table of elements

U =  238.02 gm /mole

Mg = 24.305 gm/mole

Does the question want you to weigh out protons neutrons and electrons?

Answer:

High Polarity

Lower Density Of Ice The reason icebergs are floating on the sea surface is because of this lower density. ...

High Heat Of Evaporation When water starts evaporating off of a surface, it creates an effect of cooling. ...

High Specific Heat Water manages to stay liquid because of two of its properties, high specific heat, and its high heat of vaporization. ...

Attraction To Other Polar Molecules The property of cohesion allows liquid water to have no tension on the surface.

Explanation: