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3 years ago

How does fertilizer affect nitrogen cycle

Chemistry

2 answers:

Doss [256]3 years ago

8 0

Explanation:

the nitrogen cycle is a natural process that adds nitrogen to the soil. however the use of fertilizer has increased the amount of usable nitrogen in the soil

Effectus [21]3 years ago

7 0

Cuando se usa demasiado fertilizante para las plantas una parte de ese nitrógeno no vuelve a la atmósfera y a cambio contamina el medio ambiente

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How many grams of sodium fluoride should be added to 300. mL of 0.0310 M of hydrofluoric acid to produce a buffer solution with

Kisachek [45]

Answer : The mass of sodium fluoride added should be 0.105 grams.

Explanation : Given,

The dissociation constant for HF = $K_a=6.8\times 10^{-4}$

Concentration of HF (weak acid)= 0.0310 M

First we have to calculate the value of $pK_a$ .

The expression used for the calculation of $pK_a$ is,

$pK_a=-\log (K_a)$

Now put the value of $K_a$ in this expression, we get:

$pK_a=-\log (6.8\times 10^{-4})$

$pK_a=4-\log (6.8)$

$pK_a=3.17$

Now we have to calculate the concentration of NaF.

Using Henderson Hesselbach equation :

$pH=pK_a+\log \frac{[Salt]}{[Acid]}$

$pH=pK_a+\log \frac{[NaF]}{[HF]}$

Now put all the given values in this expression, we get:

$2.60=3.17+\log (\frac{[NaF]}{0.0310})$

$[NaF]=0.00834M$

Now we have to calculate the moles of NaF.

$\text{Moles of NaF}=\text{Concentration of NaF}\times \text{Volume of solution}=0.00834M\times 0.300L=0.0025mole$

Now we have to calculate the mass of NaF.

$\text{Mass of }NaF=\text{Moles of }NaF\times \text{Molar mass of }NaF=0.0025mole\times 42g/mole=0.105g$

Therefore, the mass of sodium fluoride added should be 0.105 grams.

4 0

4 years ago

Predict (to 3 sig figs) the isochoric specific heat of gaseous SF6 (molar mass 146.06 g/mol) at 1200 K, assuming that at this te

bazaltina [42]

Explanation:

As it is known that $SF_{6}$ molecule is a non-linear molecule. Therefore, its isochoric heat capacity will be as follows.

$C_{v} = \frac{3}{2}R + \frac{3}{2}R + (3 \times 7 - 6)R$

= $\frac{3}{2}R + \frac{3}{2}R + 15R$

= 18 R

Also, $C_{V} = M \times C_{v}$

where, $C_{V}$ = molar heat capacity

M = molecular mass

$C_{v}$ = specific heat

Hence, calculate the value of $C_{v}$ as follows.

$C_{V} = M \times C_{v}$

$8 \times 8.314 \times 10^{7} = 146.06 \times C_{v}$

$C_{v} = 10.2 \times 10^{6} erg. K^{-1}. gm^{-1}$

This means that value of isochoric specific heat is $10.2 \times 10^{6} erg. K^{-1}. gm^{-1}$ .

Yes, we have to assume ideal gas behavior because for ideal gas:

dU = $nC_{v}dT$

Whereas for real gases " $\frac{an^{2}}{V^{2}}$ " has to be added here.

5 0

3 years ago

What type of metal is iron nitrate

Dima020 [189]

Answer:

tabla periodica 6

Explanation:

.....

6 0

3 years ago

What is the wavelength of the light emitted that has a frequency of 1.50 x 1013 Hz? 2.5 x 10-21 m 2.0 x 10-5 m 5.0 x 105 m 4.5 x

Inessa05 [86]

V (speed) = f (frequency) * y (meant to be lambda) (wavelength)
y = v/f (v is speed of light --3.0*10^8m/s)
y = 3.0*10^8/1.5*10^13
The answer is y = 2.0*10-5.

3 0

3 years ago

Read 2 more answers

Which postulate of daltons atomic model was later changed and why

arlik [135]

atom is indivisible particle and can be subdivided into smaller particles

3 0

2 years ago

How does ￼fertilizer affect nitrogen cycle

How does fertilizer affect nitrogen cycle