Answer:
Explanation:
The first two are easy:
H2O, H3O+ and OH- all exist in an equilibrium
[H3O+] = [OH-] = 10^-7 M
HCl is a strong acid so 1M of it will disassociate completely
[H3O+] = [Cl-] = 1 M
The third one is also an equilibrium as HNO2 is a weak acid. Ka is given so [HNO2] and [NO2-] can be calculated.
The fourth one is a buffer solution so its pH can be looked up to give the concentrations.
Answer is: the mass of the neon gas is closest to
7.8 grams.<span>
</span>
<span>V(neon) = 3.2 L;
volume.
T = 330 K; temperature of gas.
p = 3.3 atm; pressure of gas.
R = 0.08206 L·atm/mol·K; gas constant.
Ideal gas law: p·V = n·R·T.
n = p·V / R·T.
n(neon) = 3.3 atm · 3.2 L / 0.08206
L·atm/mol·K · 330 K.
n(Ne) = 0.389 mol; amount of substance.</span>
m(Ne) = n(Ne) · M(Ne).
m(Ne) = 0.389 mol · 20.2 g/mol.
m(Ne) = 7.878 g; mass of neon.
Answer:
The sun's light is blocked by the moon.
Explanation:
During the eclipse, the moon rotates right in front of the sun, that's why the eclipse is so rare and only happens every four(?) years/
Answer:
Comets are small, icy objects that have very elliptical orbits. When they are close to the Sun, they form comas and tails, which glow and make the comet more visible.
Explanation:
Hope This Helps!!
(brainliest please, if possible)
