Suppose you have 2.50 l of a substance with a density of 3.00 g/ml. convert the volume from liters to milliliters, then determine the mass of the sample in grams and convert ot kilograms.

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Answer : The mass of sample is 7.5 kilograms

Explanation :

Density : It is defined as the mass contained per unit volume.

Formula used :

Given :

Density = 3.00 g/mL

Volume = 2.50 L = 2500 mL

conversion used : (1 L = 1000 mL)

Now put all the given values in the above formula, we get:

conversion used : (1 kg = 1000 g)

Therefore, the mass of sample is 7.5 kilograms

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

hope this !

the answer is 1 i believe