Question

help plz

Answer 1

wait . Can you show me your work too ???

Answer 2

im attachin my work .

Answer 3

u have the density of the solution so u can find the mass(m) of the solution.u also have its specific heat(s).now H for this reaction for the given temperature change can be given by
H=m x s x change in temperature
the reaction is------------>Ba(OH)2 + 2HCl -->BaCl2 + 2H2O
now considering the no. of moles of the reactants,find the moles of water(n) and divide H by n to get the answer

Answer 4

So i assumed that this is a molarity problem where using the molarity formula (first converted ml to L) i found that there is 21000 moles of the Ba... solution and 42000moles of the HCl solution... am i going in the right direction?

Answer 5

it is same example like in my book but values are changed .
but that per moles H2O .Confusin me still . @Rohitkhanna Can you please check IS my work correct or not ???
I dun wanna give anyone incorrect answers .

Answer 6

i am just a bit unsure about ur step when u got 0.06 moles of both.wanna know how u came up with it??????@sarah786

Answer 7

as Ba(OH)2 means 2OH so .3 x 2 = .6 moles

Answer 8

hm.... i got a really big number... like 5.4*10^5... yikes seems unrealistic.

Answer 9

so 70cm3 of .6 M solutions = .06 moles of both
because .6 M solution means that 1000 cm3 of solution has .6 moles of solute
ops I got where I went wrong my BAd

its .04 moles for each

Answer 10

molarity=no. of moles/given volume(in litres)
0.3=n/(70/1000)
n=0.021 for Ba(OH)2
for HCl
n=0.042
as required per the equation,Hcl has twice the no. of moles than Ba(OH)2
so the reaction would consume them totally
now 2 x no. of moles of HCl=2 x no. of moles of water
as seen by the equation of this reaction
no. of moles of water=0.042
so now divide H by 0.042 to get the correct answer

Answer 11

did u get it now???@lulu456

Answer 12

yup its .04 moles for each as @Rohitkhanna mentioned . then ur answer will be 51.45 kJ/mol

Answer 13

@lulu456 are u there??????????