Question

#1: Martha has a large amount of 1.25 M H2SO4 in her lab. She needs 36 grams of H2SO4 for a chemical reaction she wants to perform. How many liters of the solution should she use?

A. 2.9 L

B. 5.8 L

C. 0.58 L

D. 0.29 L

***my answer: D. 0.29 L

is that right? @chmvijay :),

Answer 1

D. 0.29 L

Step-by-step explanation:

To calculate the required volume, we can convert the concentration of the solution from M to g/L, keeping in mind the molar mass of H₂SO₄, 98 g/mol :

1.25
`(mol)/(L)*(98g)/(1mol)=`122.5 g/L

So a concentration of 1.25 M of H₂SO₄ is the same as a concentration of 122.5 g/L.

Finally we divide 36 grams by the concentration:

`(36g)/(122.5g/L)` = 0.29 L

So your answer was correct, it is option D.

Answer 2

Yes, that is correct. There are 1.25 moles in one liter of solution, and there are about 98 grams in one mole of H2SO4. Using this information we can readily eliminate A and B as answers, as there would be far more than 36 grams in 2.9 and 5.8 liters of this solution. 98 x 1.25 = 122.5 grams of H2SO4 in one liter, and we can then divide 36 into 122.5 to arrive at 0.29L.