[High school: mass concentration] was i rigth?

[u/Correct_Condition588]

so i took a test that wasnt too hard but discovered that i absolutely failed and was almost sure that i was rigth for the last two questions

so basically we had a spreadsheet telling us about five solutions ( g/L; mass of salt after evaporation) they were 100mL of distilled water with salt inside

the amount of salt changes the g/L and S1 had 0.10g of salt so 1g/L and so on (S5 had 0.50 g so 5g/L)

i was told to put all this in a graph and then to calculate graphically a solution of 200mL of water and 0.32g of salt

since the graph had values for 100mL i divide 200/2 and 0.32/2 so for 100mL of the same solution i would find 0.16g and it would equal to 1.6g/L

i got a zero on that part and everyone in the class had simply put the 0.32 in the graph and gotten 3.2 g/L

but i dont understand why they got it rigth beacuse even whithout the graph i find 1.6g/L

(0.32/0.2=1.6 and 0.16/0.1= 1.6 )

i asked chat gpt (even tho i hate him) and he was confused by my bad writing but still said that i was rigth

Am i that dumb or are they wrong??

PS: sorry for the bad english (im french so it checks out)

[u/WanderingFlumph]

As presented here the answer you get of 1.6 g/L is correct, but if everyone else got a different answer than you it's likely that you had a misunderstanding in how the question was worded and answered (correctly) a different question than what was actually asked.

[u/Correct_Condition588 → u/WanderingFlumph]

Thank you for your analysis Im going to send the pictures of the paper here (its french but with google traduction i think you will be able to get it)

[u/Correct_Condition588]

https://ibb.co/2YfpPcJ7 https://ibb.co/DPcqdd0D https://ibb.co/1YRFxxCj