Then we can use the ideal gas law, with the given temperature and pressure, to determine the volume of gas produced. Here we have a stoichiometry problem where we need to find the number of moles of H 2 produced. What volume of H 2 is produced at 299 K and 1.07 atm when 55.8 g of Zn metal react with excess HCl? Zn(s) + 2HCl(aq) → ZnCl 2(aq) + H 2(g) The ideal gas law can also be used in stoichiometry problems. Isolating T all by itself on one side, we get T = (0. The mmHg, L, and mol units cancel, leaving the K unit, the unit of temperature. We can either convert this to atmospheres or use the value of the ideal gas constant that includes the mmHg unit. Pressure is given in units of millimeters of mercury. We can use the molar mass of Hg to convert to the number of moles. We are not given the number of moles of Hg directly, but we are given a mass.
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