<p>10.4 Solid substances A and B react to form a solid product C and a gaseous product D. Solids A, B, and C are weighted, and the volume, temperature, and pressure of gas D are measured. From this and the ideal gas law, the number of moles of D are calculated. The data are:</p>
<p>mass A reacted: 5.00g
mass of B reacted: 20.00g
mass of C produced: 15.00g
MOLES of D produced: 0.208 moles</p>
<p>The molecular weight of D is
A. 48.1
B. 2.08
C. 72.1
D. 208
E. Impossible to determine from the data given</p>
<p>I know that MW=dRT/P, but how do I calculated anything? By the way, the answer isn't E.</p>