0.5008 g of an unknown triprotic acid, H3A, is dissolved in 47.3 mL of water and then titrated with 0.315 M NaOH. It takes 25.72 mL of the NaOH solution to completely neutralize the acid. What is the molar mass of this acid

The molar mass is "185.44 g/mol".

Explanation:

According to the question,

The moles of NaOH will be:

=

=

Number of moles of an acid will be:

=

=

We know that,

⇒

hence,

Molar mass of unknown acid will be:

=

=

=

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation:

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.