The heat combustion of acetylene, C₂H₂(g), at 25°C, is –1299 kJ/mol. At this temperature, ∆H°f values for CO₂(g) and H₂O(l) are –393 and –286 kJ/mol, respectively. Calculate ∆H°f for acetylene.1 point

The yearly amounts of carbon emissions from cars in belgium are normally distributed with a mean of 13.9 gigagrams per year and a standard deviation of 5.8 gigagrams per year. find the probability that the amount of carbon emissions from cars in belgium for a randomly selected year are between 11.5 gigagrams and 14.0 gigagrams per year. a. 0.340 b. 0.660 c. 0.167 d. 0.397