Question

please help :) thanks

Answer 1

The mass of one mole of a chloride formed by a metal Y is 74.5 g.
What is the formula of the chloride?
A Y3Cl
B Y2Cl
C YCl
D YCl 2

Answer 2

@ujjwal @ramkrishna @Callisto

Answer 3

C YCl ?

Answer 4

yeah, how explanation

Answer 5

molar mass of Chlorine = 35.5
When there is one Chlorine, molar mass of metal = 74.5 - 35.5 = 39 (quite make sense to me...) Probably it's Potassium
Important note: I suck at Chemistry

Answer 6

but then without knowing it is K, arent we able to do it?

Answer 7

the valency of chlorine is 1.. that rules out option A and B.. now, if its D, two chlorine atoms would make 35.5*2=71 gm and no metal can be 74.1-71=3.5 gm..
So, the one which makes sense is option C

Answer 8

wait YCl2....?

Answer 9

I just guess it's K after knowing its molar mass.
As @ujjwal said, when there are 2 chloride ions, the molar mass of the metal becomes 74.5 - 35.5 = 3.5 (which doesn't make sense..)
So, we can neglect the option D.

Answer 10

If it is Y2, molar mass of Y = 39/5 = 19.5 (more like a non-metal in this case)
Similar case for the option Y3

Answer 11

check if my method is correct
if my method is correct, emphirical formula method.

Y : Cl
39 : 35.5
35.5: 35.5(divide)
1 : 1

Answer 12

Sorry.. I don't know if this method works... In this case, it seems to work okay. But what about when the molar mass of metal chloride = 95.3?

Answer 13

yeah but then it should be like XCl2
just like
CaCl2

Answer 14

Yup... It's MgCl2 ...
If you can work out the answer using your method, then go~ Use your method then :)