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3 years ago

What is the reactant of 2Fe2O3 = 4Fe + 3O2

Chemistry

1 answer:

Anit [1.1K]3 years ago

3 0

It depends on the direction of the arrow.

If the arrow goes like this ---> the reactant would be 2Fe2O3

If the arrow goes like this <--- the reactants would be 4Fe + 3O2

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In a chemical reaction, sulfur (S8) combines with copper to give a pure compound. If you start with 1.000 g of sulfur (S8) and o

Airida [17]

Answer: The empirical formula for the given compound is $Cu_2S$

Explanation:

We are given:

Mass of pure compound containing copper and sulfur = 4.963 g

Mass of S = 1.000 g

Mass of Cu = (4.963 - 1.000) g = 3.963 g

To formulate the empirical formula, we need to follow some steps:

Step 1: Converting the given masses into moles.

Moles of Copper = $\frac{\text{Given mass of Copper}}{\text{Molar mass of Copper}}=\frac{3.963g}{63.55g/mole}=0.0624moles$

Moles of Sulfur = $\frac{\text{Given mass of Sulfur}}{\text{Molar mass of Sulfur}}=\frac{1.000g}{32g/mole}=0.0312moles$

Step 2: Calculating the mole ratio of the given elements.

For the mole ratio, we divide each value of the moles by the smallest number of moles calculated which is 0.0312 moles.

For Copper = $\frac{0.0624}{0.0312}=2$

For Sulfur = $\frac{0.0312}{0.0312}=1$

Step 3: Taking the mole ratio as their subscripts.

The ratio of Cu : S = 2 : 1

Hence, the empirical formula for the given compound is $Cu_2S$

8 0

3 years ago

What is the easiest way to do mole conversions i.e. to grams, molecules, and formula units?

CaHeK987 [17]

Answer:

For mole conversion always remember 1 mole of compound = molar mass of compound.

Ex. 2 moles H20 to grams

2mol H2O x 18 g / 1mol H20

For molecules use Avogadro's number like moles multiplied to 6.022x10²³ answer will be in molecules.

Explanation:

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3 years ago

An electrochemical cell is constructed such that on one side a pure lead electrode is in contact with a solution containing Pb2+

Ugo [173]

Answer:

-490.7 K

Explanation:

Given:

[Ni^2+]= 0.4 M

[Pb^2+]=0.002 M

∆V= -0.012 V

VNi= -0.250V

VPb= -0.126V

F= 96500 C

R= 8.314 JK-1 mol-1

n= 2

From

T= -nF/R [∆V-(VNi-VPb)/ln [Pb2+]/[Ni2+]]

T= 2(96500)/8.314[ (-0.012) -(-0.250) - (-0.126))/ln[0.002]/[0.4]

T= 23213.856(0.112/(-5.298))

T= -490.7 K

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3 years ago

The electrical conductivities of the following 0.100 M solutions were measured in an apparatus that contained a light bulb as th

elena55 [62]

Answer: KI> Al(NO3)3> HF> CH3OH

Explanation:

Potassium iodide is a halide of group 1 which is very soluble in water and whose ions are very mobile in solution. It will readily dissociate and conduct electricity making the bulb brightest when KI is the electrolyte. Salts of group 13 are not as ionic as those of group 1 but dissociate appreciably and conduct electricity. HF is a halogen acid but self ionizes and shows some degree of conductivity. Methanol will have the lowest conductivity making the bulb dimmest when methanol is the electrolyte.

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4 years ago

If you place rice on top or a speaker, what will happen to the rice when you turn the speaker on?

Dovator [93]

Answer:

The rice will move

Explanation:

the sound vibration and waves will cause the rice to move

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3 years ago