Answer the questions in the table below about this molecule: H What is this molecule's chemical formula? Note: write the simplest molecular chemical formula, in which each element symbol appears only once. 0 CH3 How many CH3, CH2, and CH groups are in this molecule? CH₂ Осн

Tell what is wrong with each of the following formulas and write a correct formula: a. HSH hydrogen sulfide b. HCLO2 chlorous acid c. 2HN2 hydrazine-two hydrogen atoms and four nitrogen atoms d. C2H6 ethane

Ma huang, an extract from the ephedra species of plants, contains ephedrine. The Chinese have used this herb for more than 5000 years to treat asthma. More recently, ephedrine has been used in diet pills that can be purchased over the counter in herbal medicine shops. However, very serious concerns have been raised regarding these pills following reports that their use led to serious heart problems. (a) A molecular model of ephedrine is drawn below. From this determine the molecular formula for ephedrine and calculate its molar mass. (b) What is the weight percent of carbon in ephedrine? (c) Calculate the amount (moles) of ephedrine in a 0.125 g sample. (d) How many molecules of ephedrine are there in 0.125 g? How many C atoms?

Write the molecular formula and calculate the molar mass for each of the molecules shown here. Which has the largest mass percent of carbon? Of oxygen? (a) ethylene glycol (used in antifreeze) (b) dihydroxyacetone (used in artificial tanning lotions) (c) ascorbic acid, commonly known as vitamin C