<p>I am taking an AP chem course with a terrible professor, he assigned us a stickyometry problem( in this case my nick name for these nasty little problems fits perfectly). The problem is as follows:</p>

<p><em>Zn + _HCl yields _ZnCl</em> + _H2</p>

<p>the assignment associated was to find the amount of moles of Hydrogen based on the gas law pv=nrt...I did that and I got 1.7 moles, given was .0017 moles of Zn were used...I have to find the coefficients and the subscript for Cl...If anyone can help me I would be so grateful...I have an idea of how to continue the problem, but I'm just not sure...Thank you for your help...</p>