To calculate your Average value of R: Make sure you've calculated number of moles of H correctly Make sure you know Volumes of H collected Make sure you know the Pressure of H (remember to account for water vapour pressure) Make sure you know the Temperature of H (the measured temperature of the room). Calculate the value of R for trials that were within 5% difference and Calculate your Average Value of R. . . Trial # 1 wN. 2 3 Mass metal (g) 0.0124 0.0207 0.0155 Volume final Volume (ml) 19.60 32.10 23.90 initial (ml) 0.35 0.03 0.00 Volume of H collected 19.25 32.07 23.90 Ratio of Mass metal/ Vol H 0.000644 0.000645 0.000649 % difference Which trials are within 5% ? 0.15% 0.62% 0.78% within within within