Answer:
190.4g
Explanation:
1.6mol of KBr (119.002g KBr/1 mol) = 190.4g
since you want to find grams, take the molar mass of KBr (119.002) per 1 mol and use it as your conversion factor (119.002g KBr/1 mol) which will then cancel out mols and leave you with grams.
Troposphere is the highest layer of the atmosphere and touches space
Startophere is where stratus clouds form up high in the sky
The Mesosphere is the third layer you need to know and it’s low density ...yo?
Thermosphere we’re getting closer and closer to earth
Exoshpere were airplanes are high, buckle up it’s time to fly
Okay, to explain this you might have to grab a periodic table.
Do you have one? Good. Look at the most left side of the periodic table. The first group is the largest atoms in the periodic table. If you go to the right of the periodic table, the atoms get progressively smaller and smaller.
Why is this? Don't atoms get more electrons, and so become significantly bigger as they move to the right?
Although atoms do get more electrons as they go to the right, they also get more protons too. Protons pull on electrons and make atoms smaller. Because of this, going from left to right in a periodic table makes the atoms smaller and smaller, since more and more protons are added.
In this scenario, Aluminum is more to the right than Sodium, which means that it has more protons. Because of this, the protons in Aluminum pull more strongly on electrons than sodium, thus making aluminum smaller.
(Just a side note, going down in a periodic table makes the atoms bigger, since new shells are added every time)
Good luck! If you need any help, just ask :))
-T.B.
Answer: 4.55x10^-7
Explanation:
H2CO3 + H20 <==> H3O+ + HCO3-
Desigining an ICE table, we have:
Initial conc. of H2CO3 = 0.29 M
Initial conc. of H3O+ = 0
Initial conc. of HCO3- = 0
Change in conc. of H2CO3 = - x
Change in conc. of H3O+ = x
Change in conc. of HCO3- = x
Equilibrium conc. of H2CO3 = 0.29 - x
Equilibrium conc. of H3O+ = x
Equilibrium conc. of HCO3- = x
but pH = 3.44
pH = - log[H30+]
[H30+] = 10^-3.44 = 3.63x10^-4
[H30+] = 3.63x10^-4
Ka = [H3O+].[HCO3-] / [H2CO3]
[H30+] = x = 3.63x10^-4
[HCO3-] = 3.63x10^-4
[H2CO3] = 0.29 - x = 0.29 - 3.63x10^-4 = 0.289637
Ka = (3.63x10^-4)(3.63x10^-4)/0.289637 = 4.55x10^-7
