Ibuprofen a common over the counter analgesic often comes in doses of 200.0 mg and is usually taken every four to six hours. calculate the half-life, t 1/2 , of ibuprofen in hours (h) if 6.250 mg of ibuprofen remains in the body after 11.0 h.

Balance this equation: n2 + h2 > nh3, write the following molar ratios: n2 / n2 / nh3 h2 /

An observation that requires measurement is called quantitative observable or qualitative

100 grams of molten lead (600°c) is used to make musket balls. if the lead shot is allowed to cool to room temperature (21°c), what is the change in entropy (in j/k) of the lead? (for the specific heat of molten and solid lead use 1.29 j/g⋅°c; the latent heat of fusion and the melting point of lead are 2.45 × 104 j/kg and 327°c, respectively.)