Lanthanum-138 has a half-life of 105 billion years. After 525 billion years, how much of a 240 g sample of this radioisotope will remain?

nevermind, I got 7.5g and was right

6. Determine the pH of a 0.1 M solution of the following salts. a. (CH) NH2CHOO b. (CH) NH, HS

Which action will slow down the rate of a reaction? A. decreasing surface area of a solid reactant B. adding a catalyst to the reaction C. increasing the concentration of the reactants D. raising the temperature of the reactants

The volume of an object is the amount of space it takes up

The density of solid cu is 8.96 g/cm3. how many atoms are present per cubic centimeter of cu?

Using the table on the right, complete each calculation by typing in the correct answer. 13.2L=? mL

How many moles of molecular oxygen (o2) are consumed in the complete combustion of one mole of pentane (c5h12) ?

A gas has a volume of 30 L at 105 kPa. What pressure is required to compress the gas to 21 L?

Using special equipment which layer of the sun atmosphere is visible during a total solar eclipse

The characteristic flame test colors of metal ions are due to atomic emission spectra. Duscuss the relationship between the absoption and emission of light and the factors responsible for flame test colors.

Should a bartender use ice and scoop directly from ice machine or use an ice holding device and scoop to make drinks and refill drinks from