`one way to make ammonia is to synthesize it directly from elemental nitrogen and hydrogen (though this isn't that easy). the equation for this reaction would be n2 + 3 h2 → 2 nh3. if you are able to stream in 7.0 g of n2, what would be the minimum amount of h2 in grams that would be required to completely react with this amount of n2?

a. 1.5 g
b. 0.5 g
c. 0.75 g
d. 3.0 g
e. none of the above

Asolution contains 225 g of sodium chloride, nacl, dissolved in enough water to make a 0.25 l of solution. what is the molarity of the solution? a. 3.88 m, b. 1.03 m, c. 1.5 m, d. 15.5 m

7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation. 8. when a 2.5 mol of sugar (c12h22o11) are added to a certain amount of water the boiling point is raised by 1 celsius degree. if 2.5 mol of aluminum nitrate is added to the same amount of water, by how much will the boiling point be changed? show all calculations leading to your answer or use 3 – 4 sentences to explain your answer. 9. if 5.40 kcal of heat is added to 1.00 kg of water at 100⁰c, how much steam at 100⁰c is produced? show all calculations leading to an answer. 10. the freezing of water at 0⁰c can be represented as follows: h2o (l) ↔ h2o(s) the density of liquid water is 1.00 g/cm3. the density of ice is 0.92 g/cm3. in 3 – 4 sentences explain why applying pressure causes ice to melt.

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?