Question

alguien que me ayude con estos ejercicios de quimica

Answer 1

LEY DE LOS GASES IDEALS:   P  x  V = n  x  R  x  T

6.  calcular P = ?

V = 6 L
T = 300 K
R = 0.082 (L atm / mol K)
n = ?

Mm CH4 = 16 g/mol

1. calcular moles n= masa/Mm

n = 56 g/ 16 g/mol = 3.5 moles

2. calcular P =?

P =   3.5 moles  x  0.082 (L atm/mol K)  x  300 K)
      ``````````````````````````````````````````````````````````````
                                6 L

P = 14.35 atm   respuesta E

7.  calcular Mm del gas

P = 1 atm  (CN)
T = 273 K
V = 112 L
R = 0.082 ( L atm / mol K)
n = ?

1.  calcular moles

n =        112 L  x  1  atm
     ``````````````````````````````````````
     0.082 (L atm/ mol K) x 273 K

n = 5 moles

2. calcular Mm a partir de la fórmula n = masa/Mm

Mm = 400 g / 5 moles = 80 g/mol    respuesta B

8.  calcular nº de moléculas

P = 8 atm
V = 16 L
T = 127 + 273 = 400 K
n = ?
R = 0.082 (L atm / mol K)

1.  calcular moles

n =           16 L  x  8 atm
     ````````````````````````````````````````
     0.082 (L atm / mol K) x 400 K

n = 3.902 moles

2. calcula nº de moléculas

       1 mol ---- 6 x 10²³ moléculas
3.902 mol -----      x

          x = 2.34 x 10²⁴ moléculas  respuesta B