求化學英文解答(請用英文回答)急求解答謝謝

Question

1. Given 4.50g of KClO3
a.How many moles of KClO3 are in the sample?______
b.How many grams of K are in the sample?______
c.How many grams of O are in the sample?______
d.How many moles of KCl are in the sample?______
e.How many KClO3 molecules are in the sample?______
f.How many moles of K are in the sample?_______
g.How many moles of O are in the sample?_______
h.What is the per cent, by mass, of oxygen in KClO3?_______
i.What should be the mass of one KClO3 molecule?________
j.What should be the mass of one KClO3 molecules?________

2.Given 4.5g sample of KClO3 is add to 100g water.how much potassium hydroxide is produced. (Show equation and all work)

而外的題目幫忙解一下for Essay
1.Using atomic structure in your explanation, account for the general trend in atomic size as you go from left to right across a period and from top to bottom down a group on the periodic table.

2.Explain from an atomic level what happens during the flame test to the sodium atoms and why did they emit a yellow visible light.

麻煩大家嚕3Q下星期一要交

Answer 1

1.
a. 4.50/122.5=0.0367mol。
b. 4.50*(39/122.5)=1.43g。
c. 4.50*(16*3/122.5)=1.46g。
d. if KClO3 was heated to 400 degree C，the reaction would be 2KClO3-->2KCl+3O2，then you could get KCl。No further information about KCl being heated，no KCl could be produced。
e. (4.50/122.5)*6.02*10^23=2.21*10^22 molecules。
f. 4.50/122.5=0.0367 mol
g. (4.50/122.5)*3=0.110mol
h. (16*3/122.5)*100%=39.2%。
i. 122.5 a.m.u.
j. I can't tell the differences between "the mass of one KClO3 molecule" and "the mass of one KClO3 molecules"，no answer is provided.

2. KClO3+H2O-->KOH+HClO3
(4.5/122.5)*55=2.02g KOH
(soory,some comment about the reaction，I don't think it will work.)

1.Using atomic structure in your explanation, account for the general trend in atomic size as you go from left to right across a period and from top to bottom down a group on the periodic table.

The trend of the atomic size is：
it will be samller form left to right .
it will be larger form top to bottom down .

Explain from an atomic level what happen during the flame test to sodium atom and why did they emit a yellow visible light.

During the flame test to sodium atom，when it was heated ，the least tightly bound electron of sodium atom got enough energy and was removed to higher energy level(excited state).Later the electron move form the excited state to ground state would release energy by emitting a yellow visible light .