Ibuprofen has the chemical formula C3H12O2. It is 75.69% carbon, 8.80% hydrogen, and 15.51% oxygen. How many mg of carbon does a 200.0-mg tablet of ibuprofen contain?

Which of the following units is not an official si unit

At stp, which substance is the best conductor of electricity? a. nitrogen b. neon c. sulfur d. silver

What causes different colors to appear in the sky? the absorption of light by air molecules the reflection of light by bodies of water the greenhouse effect in earth's atmosphere the scattering and reflection of light by dust particles