A chemistry question on mole concept (serious answers only) ?

Question

Which sulphide contains the greatest mass of sulphur in a 10g sample? Show all WORKINGS clearly.

A---Formula (NiS)---Mass of 1 mole is 90g.
B---Formula (CuS)--- Mass of 1 mole is 96g.
C---Formula (FeS2)--- Mass of 1 mole is 120g.
D---Formula (MoS2)--- Mass of 1 mole is 160g.

Many told me the answer is A. But I think the answer is C. Please answer only if you are 100% sure. Thank you.

This has nothing to do with last minute homework. I am revising for my upcoming pure Chemistry test.

Please take note of the phrase "10g sample". The question cannot be solved directly by percentage composition, without noting the 10g.

Answer 1

We calculate the percent ratio of sulphur in each compound:

A) NiS
32 / 90 x 100 = 35.55% S

B) CuS
32 / 96 x 100 =33.33% S

C) FeS2
64 / 120 x 100 = 53.33% S

D) MoS2
64 / 160 x 100 = 40.00% S

Then the highest percentage of sulphur is in C) FeS2

-----------------
Solution:
C) FeS2 has the highest percentage of sulphur

Answer 2

Moles are horrible in the garden. Alot like people who only want serious answers.

10g is 1/9 of a mole of A.

But C and D look like they have more mass of sulfur (S2) Check the atomic weight s of Mo and Fe.

Damn math is a drain on my brain. I ain't here to do you homework!

Where is YOUR work? I could tell if you showed your equations.


I'm going out with the moles in the garden. They don't ask hard questions.

Answer 3

i think the answer is C

32/90=0.3555
32/96=0.3333
64/120=0.5333
64/160=0.4000

it's a ratio thing and since you have 32 grams of sulfur in the first two, you just divide by the mass in 1 mole, and take the highest ratio of sulfur

when you do that, you find C is the answer because there are two sulfurs = 64g per mole of a 120g/mole formula, which gives it a 0.5333 ratio and therefore the highest percentage of sulfur per sample

Answer 4

Remove Your Moles, Warts & Skin Tags in 3 Days
Easily, Naturally And Without Surgery

Answer 5

your answer c is correct. To find the correct answer calculate the percentage of sulfur in each compound.
In A % of 'S' = (32/90)x 100= 34.78
In B % of 'S' = (32/96)x 100=33.33
In C% of 'S' =(2x32/120)x100 =53.33
In D % of 'S' =(2x32/160)x100 = 40.0
Since the mass of all the four compounds are same, the compound with max. % of 'S' has max. mass of 'S'

Answer 6

first we could desire to discover the no. of moles 6.0.33 * 10^23 atoms = one million mole 12* 10^14 atoms= ? 2*10^-9 moles now mass of one million mole = 2 g there fore mass of two*10^-9 moles= 4* 10^-9 g ok i wish u have been given u r ans........ and shop on answering ques. and taking part in chem ........bye