11.68 Acetylene (ethyne) gas reacts with oxygen and burns at 3300 °C in an acetylene torch. (7.4, 7.7, 8.6, 11.4, 11.5) a. Write the balanced chemical equation for the complete combustion of acetylene. b. What is the molar mass of acetylene? c. How many grams of oxygen are needed to react with 8.5 L of acetylene gas at STP? d. How many liters of CO2 gas at STP are produced when 30.0 g of acetylene undergoes combustion?

Ethyl mercaptan is an odorous substance added to natural gas to make leaks easily detectable. A sample of ethyl mercaptan weighing 3.17 mg contains 1.64 mg of sulfur. What is the mass percentage of sulfur in the substance?

A microorganism was cultured in a flask containing a liquid medium. Samples were taken hourly and number of cells counted using a counting chamber. The data are provided below in cells per mL. Draw a growth curve in Excel and use it to calculate generation time. The answer must be provided as a number (in minutes). Time Cells per mL 81235849 0 6 7 10 26 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 2.00E+04 2.20E+04 2.30E+04 2.40E+04 3.10E+04 5.00E+04 8.06E+04 1.30E+05 2.09E+05 3.38E+05 5.44E+05 8.78E+05 1.41E+06 2.28E+06 3.68E+06 5.93E+06 9.56E+06 1.54E+07 2.48E+07 4.01E+07 6.46E+07 1.04E+08 1.68E+08 2.71E+08 2.72E+08 2.73E+08

Tell whether the entropy of the following reactions will be negative, positive or zero. b) NaNO3 + H2O -> Na^+ + NO3^- c) 4H + O2 <-> 2 H2O d) 4HO2 <-> 2H2O + O2 a) Solid Carbon Dioxide <-> Gas Carbon Dioxide

A compound contains only nitrogen and oxygen. Analysis of a/an 8.234 g sample of the compound reveals that the compound contains 4.118 grams of oxygen. How many grams of nitrogen does the sample contain? I need help with the formula for this question.

5

What is the Mass of 3.5 L of H2O

What three elements are required to start and sustain a fire?

The reaction CO (g) + H2O(g)    CO2(g) 2 + H2(g) has ΔH = -41 kJ/mol. Does the amount of H2 in an equilibrium mixture increase or decrease when the temperature is decreased?

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