Suppose 12.0 g of carbon (c) reacts with 70.0 g of sulfur (s) to give 76.0 g of the compound carbon disulfide 1 c s 2 2 . In the process, all the carb


Answer 1

Answer is: mass of unused sulfur is 5.87 grams.

Balanced chemical reaction: C + 2S → CS₂.

m(C) = 12.0 g; mass of carbon.

m(S) = 70.0 g; mass of sulfur.

n(C) = m(C) ÷ M(C).

n(C) = 12 g ÷ 12 g/mol.

n(C) = 1 mol; amount of substance.

n(S) = m(S) ÷ M(S).

n(S) = 70 g ÷ 32.065 g/mol.

n(S) = 2.183 mol.

From chemical reaction: n(C) : n₁(S) = 1 : 2.

n₁(S) = 1 mol · 2 = 2 mol.

Δn(S) = n(S) - n₁(S).

Δn(S) = 2.183 mol - 2 mol.

Δn(S) = 0.183 mol; amount of unused sulfur.

Δm(S) = 0.183 mol · 32.065 g/mol.

Δm(S) = 5.87 g.

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An experiment applies heat to a substance and produces a gas that is a new and different substance. Choose the true statement. A. This represents a physical change only.
B. This represents a chemical change only.
C. This represents both a physical and a chemical change.
D. This represents neither a physical change nor a chemical change.


I believe it is C; reasoning being that the hint for physical change is," the producing of a gas," chemical "that's new and diff. substance. "

Please help fast Rock sediments are carried to other places by the wind, running water, and gravity. As these forces lose energy settling takes place. The sediments settle out of the air or water in rock particles graded by size with heavier pieces settle out first. Which term of describes this process of sedimentary rock formation. A: Deposition B:litthification. C:physical weathering. D: Chemical weathering



The correct answer is option A, that is, deposition.


The erosion, weathering, and deposition refer to the procedures, which works spontaneously on or close to the surface of the Earth. With time, these procedures lead to the generation of sedimentary rocks.  

Deposition refers to the procedure where the rocks particles are laid down in segments with the heavier sediments forming up initially. It is the geological phenomenon in which the soil, sediments, and rocks are supplemented to a land mass or landform. Water, ice, wind, and gravity carry the previously weathered surface material that at the expense of adequate kinetic energy in the fluid gets deposited, forming up the sediment layers.  

A) deposition is the processes where particles of rock or laid down in sections with heavier sediments building up first


How many moles of gas must be forced into a 4.6 L tire to give it a gauge pressure of 34.2 psi at 30 degrees C? The gauge pressure is relative to atmospheric pressure. Assume that atmospheric pressure is 14.9 psi so that the total pressure in the tire is 49.1 psi.


when the total pressure = P gauge + P baro
                                         = 34.2 psi + 14.9 Psi = 49.1 psi 

when we convert P = 49.1 from Psi to atm it will be = 3.34 atm

so, by using the ideal gas equation:

PV = nRT 

when P is the pressure in atm = 3.34 atm 

and V is the volume in L = 4.6 L

n is the number of moles of the gas

R is the gas constant = 0.0821 atm L / mol K 

T is the temperature in Kelvin = 30°C + 273 =  303 K

so by substitution in the ideal gas equation:
∴ n = PV / RT

      = 3.34 atm * 4.6 L / 0.0821 atm L/mol K * 303 K

      = 0.618 moles 

∴ there is 0.618 moles of gas

Why is kelvin considered the best scale for measuring temperature



Kelvin is considered to be the best scale for measuring temperature for two reasons: 1, Because the Kelvin scale defines what we mean by temperature. Other scales are now defined in terms of the Kelvin scale


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