Question

PLEASE ANSWER EVERY QUESTION

1) Caffeine, C₈H₁₀N₄O₂, is a stimulant found in soft drinks and coffee. How many grams of caffeine are in 0.0150 mol of this compound?

2) Nitroglycerine is used both in the manufacture of dynamite and as a treatment for heart patients. It has the molecular formula C₃H₅(NO₃)₃. What is the molecular weight of nitroglycerine in atomic mass.

3) isopropyl alcohol, which is also known as rubbing alcohol, has the formula C₃H₈O. How many molecules of C₃H₈O are in 0.652 mol C₃H₈O?

4) Balance the combustion reaction given below:

   C₄H₁₀(g) + O₂(g) ------------ CO₂(g) + H₂O(l)

How many grams of oxygen are required to react exactly with 2.00g of butane (C₄H₁₀)?

5) A method of preparing elemental phosphorous from rock ores is shown below. Balance the reaction;

Ca₃(PO₄)₂ (s) + C(s) + SiO₂(s) --------------    CaSiO₃ (l) + CO(g) + P₄(g)

If 2.60 mol of Ca₃(PO₄)₂ (s) , 10.0 mol C, and 7.80 mol CaSiO₃ (l) are combined to perform this reaction, which statement regarding the system is true?

6) Use the following balanced chemical equation to work the following problem.

CaC₂ + 2H₂O    ---------- C₂H₂ + Ca(OH)₂

   An excess of water is reacted with 25.0 g of calcium carbide. A mass of 7.20 g of C₂H₂ is obtained. What is the percent yield of C₂H₂?

Answer 1