Which of the following measurements is expressed in three significant figures?

A. 420 mL of hydrochloric acid

B. 0.003 g of vitamin D

C. 622.00 kg of sulfur

D. 0.201 L of nitrogen gas

There are five elements named for famous scientists on the periodic table

What is the total valence electrons of CO3^-2

The density of aluminum is 2.70g/cm^3. a piece of aluminum foil has a volume of 54.0 cm^3. what is the mass of this piece of aluminum foil?

A sample of sulfuryl fluoride, SO2F2, has a mass of 19.2 g. What amount, in moles, does this mass represent?

A chemistry student needs 75.0 mL of glycerol for an experiment. By consulting the CRC Handbook of Chemistry and Physics, the student discovers that the density of glycerol is 1.26 g. cm⁻³. Calculate the mass of glycerol the student should weigh out.

If crown b is more dense than crown a then which is pure gold

In an ecosystem, a population can be defined as A. all the individuals of a species that exist together at a given place and time. B. all individuals of a species born in a specified month in every region of the world. C.

How many grams of NH3 are needed to provide the same number of molecules as in 0.55 grams of SF6?

Round 129.752416 to the requested number of significant figure a. 3 significant figures c. 6 significant figures_22 b. 4 significant figures d. 7 significant figures

What is the [oh-] in a sample of lime juice with a ph of 2.0?