Work out the molecular formula of each of the following substances. octane, with empirical formula C4H9 and Mr = 114
butanoic acid with empirical formula C2H20 and Mr = 88​

How have the greenhouse gasses increased from the year 2000 to 2018

Upon decomposition, one sample of magnesium fluoride produced 1.65 kg of magnesium and 2.56 kg of fluorine. a second sample produced 1.32 kg of magnesium. part a how much fluorine (in grams) did the second sample produce?

If e is the symbol for an element, which two of the following symbols represent isotopes of the same element? 1. e2. e3. ea.1 and 2c.1 and 4b.3 and 4d.2 and 3