What is the mass of oxygen gas in a 16.8 l container at 23.0◦c and 2.50 atm? answer in units of g?

What is the number of moles in 78.4 l of neon at stp? a. 2.75 moles b. 3.50 moles c. 4.25 moles d. 4.50 moles

How does one determine the number of core electrons an atom has? O A. Subtract the atomic number from the atomic mass. O B. Subtract the group number from the atomic number. O C. Add the atomic number and the number of valence electrons. O D.

What is the mass of 1.50 mol of sodium, na?

When 8.21 l of c3h8 (g) burn in oxygen, how many liters of oxygen are consumed? all gas volumes are measured at the same temperature and pressure but not at stp?

Explain why many Lewis acids and bases are not classified as Arrhenius or Brønsted-Lowry acids and bases

Boron has an average mass of 10.81. One isotope of boron has a mass of 10.012938 and a relative abundance of 19.80 percent. The other isotope has a relative abundance of 80.20 percent. What is the mass of the two isotopes?

What type of radiation is most likely to damage DNA? A. ionizing B. non-ionizing

Water vapor cools and comes together to form a cloud. This is an example of what change in state? condensation evaporation melting

Which group of the periodic table does this element most likely belong to

What is the ph of a 7.5*10^-3 m H + solution