Question

What is the mass of sulfur in 250 g of sulfuric acid, H2SO4?

16 g

0.33g

160 g

82 g
@sweetburger

Answer 1

@aaronq

Answer 2

@Zale101

Answer 3

Step 1: Begin with the given grams of sulfuric acid, H2SO4 (which is 250 g )
Step 2: Multiply it by the molar mass of sulfuric acid. Why? Because we want to convert it to moles of sulfuric acid. That mean the conversion factor we are going to use for the molar mass is \(\frac{mols}{grams}\) so that the grams of the molar mass will cancel with 250 grams and leaves us with moles. In other words, you are dividing 250 by the molar mass of sulfuric acid.

Answer 4

However, we are not done, but before i continue, can you do these two steps?

Answer 5

If you have already done this question, please show your work so i can correct you if you have made any mistakes or if you have no absolute idea of where to begin then i suggest to start doing these two steps i provided above.

Answer 6

98.079 x 250

Answer 7

are those the right numbers to multiply

Answer 8

Please show your units, what are you canceling here?

Answer 9

@18jonea read what i wrote carefully for step two. I didn't mention multiplying.

Answer 10

98.079g/mol x 250 g

Answer 11

you said multiply it by the molecular masss

Answer 12

oops sorry

Answer 13

@18jonea your goal is to cancel the grams.

Answer 14

250 g / 98.079mol

Answer 15

write the appropriate conversion factor for the molar mass

Answer 16

Yes you divide

Answer 17

2.549

Answer 18

But you have to make your units correct.
\(250~grams \times \LARGE \frac{moles}{98.08~grams}\)
so that the grams cancel out
\(250~\cancel{grams }\times \LARGE \frac{moles}{98.08~\cancel{grams}}\)

Answer 19

what are the units for 2.549?

Answer 20

mol?

Answer 21

Yes :)

Answer 22

Moles of sulfuric acid or H2SO4

Answer 23

So 2.549 mols of H2SO4

Answer 24

Now, your question is asking for the grams of sulfur in the sulfuric acid

Answer 25

In order to do that, you must know how to find the moles of sulfur in 2.549 sulfuric acid. .

Answer 26

so how would i do that

Answer 27

*Edited post from above there was a typo

You first need the molar mass of Sulfuric acid you then must divide the mass of sulfur by the total mass of Sulfuric acid this will give you the percent mass of Sulfur in Sulfuric acid. Then you take the 250 grams and multiply by the percent of sulfur found in sulfuric acid. This will give you the mass of sulfur in 250 grams of sulfuric acid.

Answer 28

im so confused

Answer 29

mass of sulfur/ mass of sulfuric acid = ratio of sulfur in sulfuric acid multiply this value times the number of moles of Sulfuric acid that you found (2.549moles) this will give you the moles of Sulfur then you must multiply by the mass of Sulfur. It is honestly easier in this question to never convert to moles as it causes extra steps.

Answer 30

If your still confused let us know.

Answer 31

ok can you help caue i honestly have no idea

Answer 32

how many atoms of sulfur is found in H2SO4? @18jonea

Answer 33

1

Answer 34

Good, so what do you put for the mass of sulfur when calculating \(\Large \frac{mass~of sulfur}{mass~of~sulfuric~acid}\) @sweetburger suggested you to do.

Answer 35

Answer. Just the molar mass of Sulfur

Answer 36

1 mol of sulfur is what grams?

Answer 37

@18jonea

Answer 38

34.0146

Answer 39

only 32.06 g/mol

Answer 40

o ok

Answer 41

Google molar mass of sulfur and 32.06 g/mol will come up.

Answer 42

Are we allowed to post links?

Answer 43

i just did that

Answer 44

Yes. Links for educational purposes

Answer 45

http://www.ptable.com/ pretty cool interactive periodic table that you can leave on your favorites bar

Answer 46

@sweetburger that's awesome!

Answer 47

@18jonea if you have a periodic table, you can always look at the molar mass of elements. They are all there.

Answer 48

@18jonea please show your ratio calculations when doing \(\Large\frac{ mass~sulfur}{mass~sulfuric~acid}\)

Answer 49

Can you do this now?

Answer 50

32.06/2.549

Answer 51

The denominator is incorrect, it's asking for the molar mass of sulfuric acid. Actually, let me change the wording.
\(\Large\frac{ Molar~~mass~of~sulfur}{Molar~mass~of~sulfuric~acid}\)

Answer 52

98.079

Answer 53

is that right?

Answer 54

.33 g

Answer 55

Yes. That is the molar mass of H2SO4

Answer 56

Correct, 0.33 is the ratio

Answer 57

Now read the instructions what @sweetburger said after solving for the ratio.

Answer 58

What does it say?

Answer 59

ratio of sulfur in sulfuric acid multiply this value times the number of moles of Sulfuric acid that you found (2.549moles) this will give you the moles of Sulfur then you must multiply by the mass of Sulfur.

Answer 60

Do as he says.

Answer 61

.33 x 2.549= .84117

Answer 62

Correct.

Answer 63

What are the units of 0.841?

Answer 64

g?

Answer 65

No. You multiplied the ratio with 2.549 moles of h2so4. Correct?

Answer 66

How did the answer turn into grams..?

Answer 67

so moles

Answer 68

That's right, but moles of what?

Answer 69

i dont know

Answer 70

?

Answer 71

Moles of Sulfur.

Answer 72

ok so now what do i do

Answer 73

The last step is to use the moles of sulfur and multiply by the molar mass of sulfur (g/mol) so that the moles cancel out and you are left with just grams of sulfur.

Answer 74

so what would that be?

Answer 75

?

Answer 76

I want you to do.

Answer 77

what are the numbers

Answer 78

would it be .841x 32.06= 26.96

Answer 79

@Zale101

Answer 80

@sweetburger

Answer 81

@Zale101

Answer 82

but those arent any of the answers

Answer 83

what is the answer or choices given?

Answer 84

16 g

0.33g

160 g

82 g

Answer 85

Oh I see. I think you need to multiply the ratio or percent of sulfur found in H2SO4 by the given mass of H2SO4 (250 grams). You'll get something around 82 grams That's all is to it...

Answer 86

so the answer is 82 g

Answer 87

?

Answer 88

Another way to get the answer is to use the moles of H2SO4 we solved for (2.549) and use mole to mole ratio.
\(2.549~moles~h2So4 \times \Large \frac{1~mole~S~in h2so4}{1~moles~h2so4}=2.549~moles ~of~Sulfur \)
Then you multiply the moles of sulfur (2.549 mol) by the molar mass of sulfur (32 grams per mole and you will get 82 grams of sulfur.