Why does one mole of carbon have a smaller mass than one mole of sulfur?

Which of the following statements best describes the Aufbau principle?

You need to prepare 100.0 ml of a ph 4.00 buffer solution using 0.100 m benzoic acid (pka = 4.20) and 0.120 m sodium benzoate. how many milliliters of each solution should be mixed to prepare this buffer?

Which of the following is not a reason that power plants are unable to achieve 100 percent efficiency? A. The amount of work obtained from a process never has work needing to go into it. B.

A 0.45-g sample of aspirin is decomposed into its constituent elements and found to contain 0.27 g C, 0.020 g H, and 0.16 g O. Calculate the mass percent compositions of C, H, and O in aspirin.

Sodium will react with oxygen to form sodium oxide. use the formula below to determine how many grams of sodium oxide will be formed if 46 grams of sodium are used in the reaction.

Which of these molecules is least likely to form a hydrogen bond with a water molecule

George is writing an essay about the role of observation and inference in the development of the atomic theory. He wants to explain why it was more difficult to observe the presence of neutrons in atoms.

Which pair of statements below is correct? Multiple Choice An octet is formed via ionic bonding when one or more valence electrons are transferred from one atom to another.

If wave A has a frequency of 4.60 x 10^14 s-1, what is the wavelength in nanometers (show your work) ?

What is the mass in grams of 85.32 mL of blood plasma with a density of 1.03 g/mL?