When a gas changes into a liquid, it is called condensation. ... When a liquid changes into gas, it is called evaporation. Phase changes are usually caused by changes in temperature or pressure. As the states of matter change from solid to liquid to gas, respectively, their composition changes as well.
All questions can be solved by C1V1=C2V2
1) 5.00M x V1 = 0.900M x 500.0 mL
V1= 90 ml
therefor you need to add 500 - 90 = 410.0 ml
2) 20.0 mL x C1 = 150.0mL x 1.50 M
C1= 11.25 M
3) 12.00 mL x 3.50 M = 100.0 mL x C2
C2= 0.42 M
4) 9.0 mL x 8.0 M = 0.50 M x V2
V2 = 144 ml
Answer:
0.97 atm.
Explanation:
From the question given above, the following data were obtained:
Final pressure (P2) = 6.8 atm
Initial temperature (T1) = 40 K
Final temperature (T2) = 280 K
Initial pressure (P1) =?
Thus, we can obtain the initial (original) pressure of the gas as follow:
P1/T1 = P2/T2
P1 /40 = 6.8/280
Cross multiply
P1 × 280 = 40 × 6.8
P1 × 280 = 272
Divide both side by 280
P1 = 272/280
P1 = 0.97 atm
Therefore, the original pressure of the gas is 0.97 atm.
He proved that electrons were composed of positive and negatively charged particles.<span />