23 questions, asking for guidance, senior one chemistry

Use the ideal gas equation of state: PV=NRT

Because the gas pressure is the same, p is equal, so the amount of each gaseous substance in 11dm3 is: 11p 25r, 11p 80r, 11p 90r

The volume of the solution is the same, the temperature is the same, and the ratio of the quantity to concentration of the solution substance is the ratio of the amount of the substance of the solution solute

PV=NRT can be transformed into.

t is the absolute temperature, which cannot be directly brought in by degrees Celsius, and should be converted to absolute temperature t= first

So the ratio should be 58 (::20 (:1.)

1．hf

2 HF is bonded by hydrogen bonding.

3 The ratio of its molar concentration in a dilute solution ) is:

<> full of Li guessed which Pei would like to ask for hunger.

Such an age base let the bureau sharp liquid.

(1) The same volume of gas is equal to the amount of the same substance, and the mass ratio is 30Then the ratio of the relative molecular mass is yes, and the relative molecular mass is 60

60 * 60 * can be approximately equal to the calculation, because the actual result of the mass fraction calculation is often approximately equal to) 60*( 32 16 = 2

Then the molecular formula is C2H4O2 [do the math, the result is not 60].

2) Reacting with sodium carbonate, A is formic acid (CH3COOH) resulting in the formation of CO2, CH3COONA, H2O

3) Aromatic odor, is an ester. Then a is methyl formate (HCOOCH3), the equation is not written, and the products are sodium formate and methanol.

c2h4o2

2ch3cooh+na2co3==2ch3coona+h2o+co2

The equation for the reaction of methyl formate with NaOH.

one:y=h2; hc+nh3=nh4cl;

two:b:so2; naoh+h2s

h2s+o2-

I'll do the rest.

Stay away from Huang Yuan, academics, career, body, etc. can be long-term!!

You think of it as the amount of matter of the elements to do! Write out the number of moles for each element, then choose the question technique, bring the numbers in and see if it is the same as the number of moles required earlier! It is better to teach a man to fish than to teach him to fish!