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3 years ago

PLEASE HELP

Chemistry

1 answer:

Anna71 [15]3 years ago

6 0

Answer:

Explanation:

Balanced equation

2Fe + 3H2SO4 → Fe2(SO4)3 + 3H2.

Subscripts

This is a very important question. It is good to know the answer. The subscripts cannot be altered because that's the way the molecule is constructed. For example, it takes 2 Hydrogens to mix with one SO4 ion. That's the way Sulfuric acid is found in nature. There are no other ways to write 2H+ and SO4-2

You can alter (and you must alter) the way the molecules react with each other. You need to make sure that the Conservation of Mass law is always being obeyed. So when you have 6 H's on the left, you must have the same number on the right. 6 grams of hydrogen on the left = 5 hydrogens on the right.

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The valency of metal 'm' 1+. give the formula of its oxide

Vinvika [58]

Answer:

$M_{2}O$

Explanation:

Anything oxide is a compound with oxygen, and since oxygen is -2, it requires two of the metal's +1 to make it zero

In other words:

2(+1) + (-1) = 0

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The given statement is true.

A classic, predominantly silt-sized sediment, which is produced due to the gathering of wind-blown dust is known as loess. About 10 percent of the land region of the Earth is covered by loess or identical sediments. The loess seems to form into very rich soils. Under suitable climatic circumstances, it is one of the most agricultural productive terrains around the globe.

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Students conducted an investigation into the three elements listed above. What type of element should Sulfur be labeled?

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A sample of nitrogen containing 3.0×10^23 molecules has the same number of molecules as a sample containing

Daniel [21]

Answer:

D) 0.50 mole of Ne

Explanation:

Given data:

Number of molecules of nitrogen = 3.0×10²³ molecules

Which sample contain same number of molecules as nitrogen= ?

Solution:

A) 0.25 mole of O₂

1 mole = 6.022×10²³ molecules

0.25 mol × 6.022×10²³ molecules / 1 mol

1.51×10²³ molecules

B) 2.0 moles of He.

1 mole = 6.022×10²³ molecules

2.0 mol × 6.022×10²³ molecules / 1 mol

12.044×10²³ molecules

C) 1.0 moles of H₂

1 mole = 6.022×10²³ molecules

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1 mole = 6.022×10²³ molecules

0.50 mol × 6.022×10²³ molecules / 1 mol

3.0×10²³ molecules

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3 years ago

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tankabanditka [31]

Explanation:

(a) Equilibrium constant expression is ratio of concentrations of products over reactants each raised to their power of stoichiometric coefficients.

For example consider an equilibrium which is:

$aA+bB\rightleftharpoons cC+dD$

The expression is:

$K_c=\frac {[C]^c[D]^d}{[A]^a[B]^b}$

(b) Equilibrium constant of the chemical reaction is value of the reaction quotient of the reaction at the stage of chemical equilibrium which is a state that is approached by the dynamic chemical system at which the composition of the reactant and the product has no measurable tendency towards the change.

(c) Absorbance is the measure of capacity of the substance to absorb the light of a specific wavelength. Absorbance is equal to the logarithm of reciprocal of transmittance.

(d) The Beer's law relates attenuation of the light to properties of material through which light is travelling.

The expression for the law is:

A = ε × l× c

Where,

A is the absorbance

ε is molar absorptivity coefficient

l is the path length

c is the concentration.

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