How many moles of boron are in 37.8 grams of boron?

The half-life of cesium-137 is 30 years. Suppose we have a 200-mg sample. (a) Find the mass that remains after t years.

he compound known as butylated hydroxytoluene, abbreviated as BHT, contains carbon, hydrogen, and oxygen. A 3.376 g sample of BHT was combusted in an oxygen rich environment to produce 10.11 g of CO2 (g) and 3.312 g of H2O (g).

Which characteristic would you predict from a solution that has a pH of 5? sour taste very high concentration of hydroxide ions slippery feeling very low concentration of hydronium ions

Analysis of a compound indicates that it contians 1.04 g k, 0.70 g cr, and 0.86 g o. find its empirical formula. 1. k2cro3 2. kcro4 3. k2cro4 4. kcro3

Formic acid is present in ant venom and causes the pain of their sting. the iupac name for formic acid is methanoic acid. this tells you how many carbon atoms the acid has. draw its structure.

What kingdom is humans in!

Propane (C3H8) has a molar mass of 132 g/mole. You started out the day with a tank containing 9071 g of propane. At the end of the day, your tank contained 7532 g of propane gas. How many moles of gas did you use?

Why decomposition of ammonium nitrate is a redox reaction?

Two formulas for compounds containing hydrogen and oxygen are H2O and H2O2. Do these formulas represent the same compound? Explain.

My dog made become frightened and cover when he hears loud thunder this is an example of a reaction to What kind of stimuli A. chemicals B. light C. touch D. sound