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Select ALL substances that involve only covalent bonding.

Convert 7.86 x 10-2 km to nanometers.

What is the mass (in grams) of 1.25 moles of NH3?

If a rectangular piece of metal foil measures 27.7 mm x 42.5 mm x 0.05 mm, what is the volume of this sample of metal. Express to correct number of significant figures.

What percentage of U-238 radionuclides in a sample remain after 3 half-lives?  Assume 100 % initially at time zero.

There are 2.54 cm in 1 inch and 36 inches in 1 yard.  A footprint was measured to be 0.28 yards.  This measurement should be reported as  _____ centimeters. Express to correct number of significant figures.

There are 2.54 cm in 1 inch and 36 inches in 1 yard.  A footprint was measured to be 0.25 yards.  This measurement should be reported as  _____ centimeters. Express to correct number of significant figures.

If the pH of a solution is 12, what is the [H+]?

What is the mass (in grams) of 1.75 moles of NH3?

What is the %S in K2S?