An excess of zinc is added to 100 cm3 of 1.0 mol/dm3 hydrochloric acid, The equation for the reaction is:
Zn + 2HCI → ZnCl2 + H2
What is the maximum volume of hydrogen evolved at room temperature and pressure?
A) 1.2 dm3 C) 2.4 dm3
B) 2.0 dm3 D) 24 dm3

For a research project, a student decided to test the effect of the lead(ii) ion (pb2+) on the ability of salmon eggs to hatch. this ion was obtainable from the water‐soluble salt, lead(ii) nitrate, which the student decided to make by the following reaction. pbo(s) + 2 hno3(aq) → pb(no3)2(aq) + h2o losses of product for various reasons were expected, and a yield of 86.0% was expected. in order to have 5.00 g of product at this yield, how many grams of pbo should be reacted? (assume that sufficient nitric acid, hno3, would be used.)