Balance the following equation. Enter just the number (no spaces or any other characters.). If the coefficient is 1 (one) enter the number 1 otherwise Canvas will mark it unanswered and you will lose the points. [a] HClO4   + [b]  P4O10 (g)  →  [c] H3PO4(g)  +  [d] Cl2O7

Which of the following (with specific heat capacity provided) would show the largest temperature change upon gaining 200.0 J of heat?

Balance the following equation. Enter just the number (no spaces or any other characters.). If the coefficient is 1 (one) enter the number 1 otherwise Canvas will mark it unanswered and you will lose the points. [a] C7H9   + [b]  HNO3  →  [c] C7H6(NO2 ) 3  +  [d] H2O(g)

A coffee-cup calorimeter contains 100.0 mL of 1.000 M HCl (excess) at 20.3 °C. When 1.82 g Zn(s) is added, the temperature rises to 30.5 °C. What is the heat of reaction per mol Zn? Assume that the heat of solution is that of water, and the density of the HCl is 1.000 g/mL.  Zn(s)  + 2 HCl(aq)  → ZnCl2(aq)  + H2(g)   

Balance the following equation. Enter just the number (no spaces or any other characters.). If the coefficient is 1 (one) enter the number 1 otherwise Canvas will mark it unanswered and you will lose the points. [a] KNO3   + [b]  H2CO3  →  [c] K2CO3  +  [d] HNO3

Balance the following equation. Enter just the number (no spaces or any other characters.). If the coefficient is 1 (one) enter the number 1 otherwise Canvas will mark it unanswered and you will lose the points. [a] C₂H₆O   + [b] O₂  →  [c] CO₂  +  [d] H₂O

For many years, the extraction of gold (the separation of gold from other materials) involved the use of potassium cyanide according to the reaction: 4 Au(s)  + 8 KCN(aq)  + O2(g)  + 2 H2O(l)  → 4 KAu(CN)2(aq)  + 4 KOH­(aq) What is the minimum amount (in mL) of a 0.750 M KCN solution needed to extract 29.0g (about an ounce) of gold? Must show your work on scratch paper to receive credit.

Balance the following equation. Enter just the number (no spaces or any other characters.). If the coefficient is 1 (one) enter the number 1 otherwise Canvas will mark it unanswered and you will lose the points. [a] TiCl₄   + [b] H₂O  →  [c] TiO₂  +  [d] HCl

A sample that contains 53.66% of oxalic acid by, H2C2O4, by mass is reacted with sodium hydroxide (NaOH) for neutralization. If a 0.6543 g of the oxalic acid sample is reacted, what is the volume (in mL) of 0.3483 M NaOH required for the neutralization. Hint: Do not forget the percent composition of oxalic acid. Must show your work on scratch paper to receive credit. 2 NaOH(aq)  + H2C2O4(aq)   →  Na2C2O4(aq)  + 2 H2O­(l)

A 31.5 mL aliquot of H2SO4 (aq) of unknown concentration was titrated with 0.134 M NaOH (aq). It took 23.9 mL of the base to reach the endpoint of the titration. What is the molarity of the acid? Must show your work on scratch paper to receive credit. 2 NaOH(aq)  + H2SO4(aq)   →  Na2SO4(aq)  + 2 H2O­(l)