Under which conditions is a reaction spontaneous?

when the temperature is zero and the enthalpy is positive and high and the entropy of the change is negative and high.

when the temperature and entropy of a change are high and positive and the enthalpy is low and negative.

when the enthalpy of the change is small and negative and the product of temperature and entropy is large and negative.

when the temperature and the enthalpy are positive and high and the entropy of the change is negative and high.
done

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.)