1972 Ap Chemistry Free Response Answers |verified| -

Based on a compilation of "Free Response Questions & Answers 1970 to 2005," we can examine the two most commonly cited 1972 AP Chemistry free response problems. Below are the questions as they would have appeared, followed by the official-style answers and detailed explanations.

The formula is $M_2O_3$. The ratio of Metal to Oxygen is $2:3$. $$ \textMoles M = \frac23 \times (\textMoles O) $$ $$ \textMoles M = \frac23 \times 0.0132\text mol = 0.00880\text mol $$ 1972 ap chemistry free response answers

Since $K_a$ is very small, $x$ is negligible compared to $0.10$. $$ 5.56 \times 10^-10 \approx \fracx^20.10 $$ $$ x^2 = 5.56 \times 10^-11 $$ $$ x = [H^+] = 7.46 \times 10^-6\text M $$ Based on a compilation of "Free Response Questions

ΔH°f (C2H5OH, l) = -277.4 kJ/mol

If the gas consists of 85.7% carbon and 14.3% hydrogen by mass, determine its empirical and molecular formulas. Part 1: Calculating Molar Mass To find the molar mass ( ), use the Ideal Gas Law rearranged to include mass ( ) and molar mass ( The ratio of Metal to Oxygen is $2:3$