Which compound is a conjugate acid-base pair?

H2PO4 - and HPO42-

H3PO4 and HPO42-

H2PO4 - and PO43-

H3PO4 and PO43-

Which of the following forms a covalent bond with nitrogen? A. lithium (Li) B. calcium (Ca) C. carbon (C) D. argon (Ar)

What is the total mass of 2.0 moles of h2 ( g.?

Define empirical formula

What is the significant figure of 0.052301 km

A 9.03 g sample of an aqueous solution of nitric acid contains an unknown amount of the acid. If 12.0 mL of 0.655 M barium hydroxide are required to neutralize the nitric acid, what is the percent by mass of nitric acid in the mixture?

How many moles of KCl will be produced from 15.0 g of KClO3?

According to kinetic molecular theory, collisions between gas particles in a sample of an ideal gas (1) increase the energy content of the gas sample (2) produce strong attractive forces between the gas particles (3) result in a net loss of energy

How do transmittance, absorbance, and molar absorptivity differ? Which one is proportional to concentration?

A particular alloy is made of two metals. The density of one of the metals (call it metal A) is 3.0 g/cm3. The density of the other metal (call it metal B) is 5.0 g/cm3. If the density of the alloy is 4.

Who determined that the elements needed to be arranged by atomic number instead of atomic mass?