How is 0.00069 written in scientific notation?

A certain element x has four isotopes. 0.5600% of x has a mass of 83.91343 amu. 9.860% of x has a mass of 85.90927 amu. 7.000% of x has a mass of 86.90890 amu. 82.58% of x has a mass of 87.90562 amu. What is the average atomic mass of element x?

How many moles are there in 20.0 grams of FeCl3?

The mass in a chemical reaction is found in

The acid dissociation constant ka for an unknown acid ha is 4.57 x 10^-3 what is the base dissociation constant kb for th econjugate base of the acid anion a-

There are 12 inches (in). in 1 foot (ft). which expression can be used to find the number of inches in 2.5 feet?

Write the equilibrium constant: Pb3 (PO4) 2 (s) = 3Pb2 + (aq) + 2PO2 (aq)

How many orbitals are there in the shell with n = 4?

Using the balanced equation shown below, calculate the mass of c3h8 that must react in order to release 2.45*106 * 106 kj of heat. δhrxn = - 2219.9 kj

True or False Aluminum does not perform well at elevated temperatures

What is its pressure if its volume is changed to 10.1 L? Express your answer using two significant figures.