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3 years ago

The total number of electron pairs in a nitrogen molecules.is: a) 2 b) 3 c) 5 d) 7

Chemistry

1 answer:

Mekhanik [1.2K]3 years ago

3 0

nitrogen's atomic no. is 7 which is the amount of protons and the amount of protons is equal to the amount of electrons

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4.2 L of a gas has a pressure of 560mmHg at 72⁰F. What is the temperature at760mmHg if the volume is still 4.2 L? (5 pts)

IgorLugansk [536]

Answer:

The temperature at 760mmHg if the volume is still 4.2 L is 400.862 K

Explanation:

Gay Lussac's law indicates that when there is a constant volume, as the temperature increases, the pressure of the gas increases. And when the temperature is decreased, the pressure of the gas decreases. This law can be expressed mathematically as follows:

$\frac{P}{T} =k$

Having an initial state 1 and a final state 2, the following is true:

$\frac{P1}{T1} =\frac{P2}{T2}$

In this case:

P1= 560 mmHg
T1= 72 F= 295.372 K (being 32 F= 273.15 K)
P2= 760 mmHg
T2= ?

Replacing:

$\frac{560 mmHg}{295.372 K} =\frac{760 mmHg}{T2}$

Solving:

$T2= 760 mmHg*\frac{295.372 K}{560 mmHg}$

T2= 400.862 K

8 0

3 years ago

How are genes and alleles related

Montano1993 [528]

Alleles are inside a gene and genes are made up by alleles. Also, a gene is DNA, so the allele is like piece of DNA inside a gene<span>.

Hope this helps:)
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7 0

3 years ago

The compound P4S3 is used in matches and reacts with oxygen through the chemical reaction shown below.

devlian [24]

Answer:

$m_{SO_2}=0.175gSO_2$

Explanation:

Hello,

In this case, since the first step is to write the properly balanced chemical reaction:

$P_4S_3 (s) + 8O_2 (g)\rightarrow P_4O_{10}(s) + 3SO_2 (g)$

We can see that given the 0.200 g of P4S3 (molar mass 220 g/mol) the mole ratio between it and SO2 (molar mass 64 g/mol) is 1:3, therefore, the produced mass of SO2 turns out:

$m_{SO_2}=0.200gP_4S_3*\frac{1molP_4S_3}{220gP_4S_3} *\frac{3molSO_2}{1molP_4S_3} *\frac{64gSO_2}{1molSO_2} \\\\m_{SO_2}=0.175gSO_2$

Best regards.

5 0

3 years ago

Concentration is the amount of material dissolved in a measure of liquid?<br> true or false

avanturin [10]

Answer:

True

Explanation:

the relative amount of a given substance contained within a solution or in a particular volume of space; the amount of solute per unit volume of solution;.

6 0

3 years ago

If the a of a monoprotic weak acid is 1. 2×10^−6. What is the [H] of a 0. 31 m solution of this acid?

Vanyuwa [196]

The pH of the solution of the given acid is 3.099

Let HX be the weak acid:

HX ⇌ $H^{+}$ + $X^{-}$

For which:

$K_{a}$ = [ $H^{+}$ ][ $X^{-}$ ] / [HX]

If $K_{a}$ lies in the range $10^{-4} - 10^{-10}$ we can assume that the equilibrium concentrations used in the expression are a good enough approximation to the initial concentrations.