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#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 :),

Respuesta :

W0lf93
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.
maacastrobr

Answer:

D. 0.29 L

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 [tex]\frac{mol}{L}*\frac{98g}{1mol}=[/tex]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:

[tex]\frac{36g}{122.5g/L}[/tex] = 0.29 L

So your answer was correct, it is option D.