What is the mass of a sample of 9,9 x 1025 molecules of h2

What woukd most likely be the transmittance at a 0.70 m solution of solute a? a) 7.6%b) 1.1%c)4.0%d)4.6%

The valence of aluminum is +3, and the valence of the chlorine is -1. the formula fir the aluminum chloride is correctly written as

Show how to convert the temperature 84.7° c to kelvin. include all steps and label the final answer