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Mars2501 [29]
3 years ago
12

Explain in your own words how DDT moved through the environment starting with spraying the farm crops

Chemistry
1 answer:
S_A_V [24]3 years ago
7 0

Answer:

here and a cylinder have the same radius and height. The volume of the cylinder is .



What is the volume of the sphere?









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If the reaction N2 (g) + 3 H2 (g) --> 2 NH3 (g) has the concentrations 1.1 M for nitrogen, 0.75 M for hydrogen and 0.25 M fo
Luba_88 [7]

<u>Answer:</u> The value of K_c is 0.136 and is reactant favored.

<u>Explanation:</u>

Equilibrium constant in terms of concentration is defined as the ratio of concentration of products to the concentration of reactants each raised to the power their stoichiometric ratios. It is expressed as K_{c}

For the chemical reaction between carbon monoxide and hydrogen follows the equation:

N_2(g)+3H_2(g)\rightleftharpoons 2NH_3(g)

The expression for the K_{c} is given as:

K_{c}=\frac{[NH_3]^2}{[N_2][H_2]^3}

We are given:

[NH_3]=0.25M

[H_2]=0.75M

[N_2]=1.1M

Putting values in above equation, we get:

K_c=\frac{(0.25)^2}{1.1\times (0.75)^3}

K_c=0.135

There are 3 conditions:

  • When K_{c}>1; the reaction is product favored.
  • When K_{c}; the reaction is reactant favored.
  • When K_{c}=1; the reaction is in equilibrium.

For the given reaction, the value of K_c is less than 1. Thus, the reaction is reactant favored.

Hence, the value of K_c is 0.136 and is reactant favored.

4 0
3 years ago
Niobium-91 has a half-life of 680 years. After 2,040 years, how much niobium-91 will remain from a 300.0-g sample? 3 g 18.75 g 3
Vadim26 [7]
Amount of Niobium-91 initially
= 300/91 =3.2967mol
2040 years = 3 ×680 = 3 half-lives
therefore, amount left = 0.4121mol
mass of Niobium-91 remaining = 0.4121 ×91 =37.5g
7 0
3 years ago
Read 2 more answers
5. Why are the noble gases such as helium (He) and neon (Ne) grouped
GalinKa [24]

Answer:

A. They are nonreactive gases

8 0
2 years ago
If one gram of sulphur dioxide contains x molecules what will be the number of molecules in 1g of methane
evablogger [386]

The ratio of molecules in sulphur dioxide and methane will be the same as the ratio of their moles. So, first of all we should find out the number of moles of sulphur dioxide in 1 gram of sulphur dioxide in 1 gram of sulphur dioxide, and the number of moles of methane in 1 gram of methane. This can be done as follows :

(i) The molecular formula of sulphur dioxide is SO_{2}

So, 1  mole of SO_{2} = Mass of 2'O'

=32+2*16

= 64 grams

Now, 64g of sulphur dioxide = 1 mole

So, 1g of sulphur dioxide = \frac{1}{64} mole

Thus, we have \frac{1}{64} mole of sulphur dioxide and it contains molecules in it. Now, since equal moles of all the substance contain equal number of molecules, therefore, \frac{1}{64} mole of methane will also contain x molecules of methane.

(ii) Molecular formula of methan is CH_{4}

So, 1 mole of CH_{4}  = Mass of C + Mass of 4 H

=12+4*12

Now, 16g of methane = 1 mole

So, 1 g of mathane = \frac{1}{16} mole

We know that:

\frac{1}{64} mole of methane contains = x molecules

So, \frac{1}{16}  mole of contains will contain =\frac{x*64}{16} molecules

=4x molecules

7 0
2 years ago
PLEASE HELP!!!
Furkat [3]

Answer:

The water is impure

Explanation:

Impurities raises the boiling points and lowers the melting point

7 0
3 years ago
Read 2 more answers
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