Answer:
Explanation:
Hello,
In this case, since the percent abundance of Br-79 is 51.1% and that of the Br-81 is 48.9 %, we can write:
Taking into account that the mass of bromine from the periodic table is 79.909 amu, the mass of Br-81 turns out:
Best regards.
There are dm 0.145 in 14.5 mm
Salutations!
<span>In a laboratory experiment, John uses a mesh to separate soil particles from water. Which technique of separation is he using?
The technique that John is using is the filtration technique. Filtration is a technique to separate the solid which is insoluble from the liquid. For instance: Sand and water, sand is insoluble, thus it stays in the filter paper, while the water proceeds through the filter paper.
Hope I helped :D</span>
Answe 174.0 KPA
Explanation:
0°C in 101.3 K PA pressure a sample of gas occupies 30 mL if the temperature is increased to 30°C in the entire gas sample is transferred to a 20 mL container what will be the gas pressure inside a container
PV=nRTt
so
n = PV/RT
P = 101.3 KPA
T = 0+273.2 = 273.200
V = (30/1000) L = 0.03 L
R =0.082
SO
n= (101.3 X 0.03)/(0.082 X 273.2)
= 0.14 moles
PV= nRT
N= 0,14
T = 30 + 273.2= 303.2
V= (20/1000)L =0.02L
since PV = nRT
THEN
P=nRT/V
so
P=(0.14 X 0.082 X 303.2)/0.02 =
174.0 KPA