A new element, Thorsonium has two isotopes. 67.52\% of the Thorsonium isotopes have a mass of 256 amu. The rest of the sample is Thorsonium - 257 Find the average atomic mass of Thorsonium

Which of the following is true for the actual yield of a reaction? it is always calculated as a ratio. it is the yield from the excess reactant. it is the yield from the limiting reactant. it is always less than the theoretical yield.

Frictional forces acting on an object are often converted into energy, which causes the temperature of the object to rise slightly.

Apiece of copper has a temperature of 75.6 0c. when the metal is placed in 100.0 grams of water at 19.1 0c, the temperature rises by 5.5 0c. what is the mass of the metal?