You react hydrogen gas with chlorine gas according to the following reaction: H2(g) * Cl2(g) -> 2HCl(g)
What mass of HCl(g) can be produced from 2.5 * 10^3 g of hydrogen gas with an excess of chlorine gas?

91150 g

Explanation:

First we convert 2.5x10³ g of hydrogen gas into moles, using its molar mass:

Then we convert 1250 moles of H₂ into HCl moles, using the stoichiometric coefficients of the reaction:

Finally we convert 2500 moles of HCl into grams, using its molar mass:

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).