Determine the number of significant figures in each measurement.

12.90 s

Coliform bacteria are found in human and animal waste true or false

Calculate the mass of aluminum in 250 g of Al (C2H3O2) 3

Using the periodic table, find the molecular mass of H2. H2 = g/mole

26.0 g of a liquid that has a density of 1.44 g/mL needs to be measured out in a graduated cylinder. what volume should be used

True or false? the current number one method of disposal of municipal solid waste is combustion.

Enter your answer in the provided box. A sample of an unknown gas effuses in 14.5 min. An equal volume of H2 in the same apparatus under the same conditions effuses in 2.42 min. What is the molar mass of the unknown gas

What volume will 0.710 moles of nitrogen gas occupy at STP?

4) Acompound has an empirical formula of Na2co3, and a molar mass of 3.18g/mol. Find its molecular formula.

How many molecules of glucose, C6H12O6, can be "burned" biologically when 283.2 grams of oxygen is a available?

Why does acids that has been accidentally spilled on a book cause the colour of the book cover and the ink to change?