My Benzene Law Firm

HN03 + Mg(OH)3—-> HOH + Mg(NO3)2

And could someone check these few please? Thanks

Benzene is a common hydrocarbon which is widely used as a solvent. Benzene is 92.3% carbon and 7.7% hydrogen.
a)What is the empirical formula for benzene? I got CH

b)From another experiment the molecular mass of benzene was determined to be 78 grams per mole. What is the molecular forumla for benzen? I came up with C6H6

Aspirin is 60% carbon, 4.48% hydrogen and 35.53% oxygen. What is the empirical forumla for aspirin? I came up with C9H8O4.

A) and b) are correct
Aspirin is correct

NOTE: it is Mg(OH)2 not Mg(OH)3
The balanced equation is-
2HNO3 + Mg(OH)2 –> 2H2O + Mg(NO3)2
Determine the molar mass of HNO3 (times 2) and Mg(OH)2 and add them together. Then determine the molar mass of H2O (times 2) and Mg(NO3)2 and add them together. Are the two numbers the same (the mass of the reactants and the mass of the products)?

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