What is the mass of a sample of copper that contains 4.78 x 1023 atoms?

the half-life of plutonium-239 is 24,110 years. How much of an original mass of 100.0 grams remains after 96,440 years?

Without doing a calculation, predict whether the entropy change will be positive or negative when the following reaction occurs in the direction it is written. a. CO2 (g) + 2H2 (g) → CH3OH (l) b. Br2 (l) + H2 (g) → 2HBr (g) c.

The word atom comes from Greek word that means?

How many grams of NH3 are needed to provide the same number of molecules as in 0.55 grams of SF6?

Which phase of matter completely fills its container? A. Gas B. None of these C. Liquid D. All of these

Describe the change in energy that occurs as bonds are broken and formed

What element is in column 7A period 4? Select one: 0 a. Manganesse b. None of these are in that location c. lodine d. Bh - Element #107 e. Bromine

An element's atomic number is 60. How many electrons would an atom of this element have?

El vinagre es una suspensión?

How many liters of hydrogen gas are needed to react with cs2 to produce 2.50 l of ch4 at stp? 4h2 (g) + cs2 (l) → ch4 (g) + 2h2s (g) ?