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Komok [63]
3 years ago
13

HELP PLEASE!! (100 points)

Chemistry
1 answer:
MrRa [10]3 years ago
3 0

Answer:

As you cool a matter to absolute zero, their kinetic energy reduces significantly and the molecules slows down and begins to aggregate together. ... As heat is added, the molecules gain more kinetic energy. This shown in their increase motion. When heat is withdrawn, the particles slows down hope this helped

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En condiciones normales 1g de aire ocupa un volumen de 773 mL ¿ qué volumen ocupará la misma masa de aire a 0 ºC y la presión a
emmainna [20.7K]

Answer:

El volumen que ocupará la misma masa de aire es 839.49 mL.

Explanation:

Las condiciones normales de presión y temperatura (abreviado CNPT) o presión y temperatura normales (abreviado PTN o TPN), son términos que implican que la temperatura referenciada es de 0ºC (273,15 K) y la presión de 1 atm (definida como 101.325 Pa).

La ley de Boyle dice que “El volumen ocupado por una determinada masa gaseosa a temperatura constante, es inversamente proporcional a la presión”  y se matemáticamente como

Presión*Volumen=constante

o P*V=k

La ley de Charles es una ley que dice que cuando la cantidad de gas y de presión se mantienen constantes, el cociente que existe entre el volumen y la temperatura siempre tendrán el mismo valor:  

\frac{V}{T} =k

La ley de Gay-Lussac​ establece que la presión de un volumen fijo de un gas, es directamente proporcional a su temperatura. Se expresa matemáticamente como:

\frac{P}{T} =k

Combinando estas tres leyes se obtiene:

\frac{P*V}{T} =k

Siendo un estado inicial 1 y un estado final 2, la expresión anterior queda determinada como:

\frac{P1*V1}{T1} =\frac{P2*V2}{T2}

En este caso:

  • P1=  101325 Pa
  • V1= 773 mL
  • T1= 273.15 K
  • P2= 93,3 kPa= 93300 Pa
  • V2= ?
  • T2= 0°C= 273.15 K

Reemplazando:

\frac{101325 Pa*773 mL}{273,15 K} =\frac{93300 Pa*V2}{273.15 K}

y resolviendo obtenes:

V2=\frac{273.15 K}{93300 Pa} *\frac{101325 Pa*773 mL}{273,15 K}

V2= 839,49 mL

<u><em>El volumen que ocupará la misma masa de aire es 839.49 mL.</em></u>

8 0
3 years ago
Analysis of a sample of a compound, containing only carbon, nitrogen, hydrogen, and oxygen, determined that it contained 20.0% C
choli [55]

Answer:

CH₄N₂O

Explanation:

Let's assume 100 g of the compound, thus, the mass of each substance is it percent multiplied by 100:

C = 20.0 g (20% = 0.20, and 0.20*100 = 20.0)

H = 6.7 g

N = 46.6 g

O = 100 - (20+6.7+46.6) = 26.7 g

The number of moles of each compound is the mass divided by the molar mass. The molar masses are C = 12.011 g/mol, H = 1.00794 g/mol, N = 14.01 g/mol, and O = 15.999 g/mol, so:

nC = 20/12.011 = 1.67 mol

nH = 6.7/1.00794 = 6.65 mol

nN = 46.6/14.01 = 3.33 mol

nO = 26.7/15.999 = 1.67 mol

The empirical formula is the formula with the minimum possible number of the moles of each compound, which must be proportional to the percent of each one. So, we must divide each number of moles for the smallest, 1.67:

C = 1.67/1.67 = 1

H = 6.65/1.67 = 4

N = 3.33/1.67 = 2

O = 1.67/1.67 = 1

So, the empirical formula is CH₄N₂O.

6 0
4 years ago
A desk measures 42 inches long. How many meters is that?
Montano1993 [528]

Answer:1.067

Explanation:

look it up

8 0
3 years ago
Read 2 more answers
A physical property can be _________
mafiozo [28]

Answer:

color, texture, size

Explanation:

6 0
1 year ago
Calculate the percentage by mass of lead in pbco3.
nignag [31]
Pb/pbco3*100
207/207+12+48
207/267*100
=77.53%
5 0
4 years ago
Read 2 more answers
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