Blog

Calculate the molar mass of rubidium carbonate, Rb2CO3.

In the modern model of the atom, the protons and neutrons occupy the central region of the atom named the nucleus.

The bonding in CH4 can be characterized by: Select all that apply

What is the velocity of an electron (m = 9.11 × 10–31 kg) that exhibits a de Broglie wavelength of 10.0 nm?  [1 J = 1 kg•m2•s–2]

For the transition metal with the electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d6, how many unpaired electrons are present in its +2 ion in the ground state?

Comparison of the properties of PF3 and PF5 indicates that PF3 is polar while PF5 is nonpolar. Select the best explanation based on VSEPR for this observation.

Select the common unit cells

A 16.0 gram sample of propane gas (C3H8) is burned according to the equation C3H8(g) + 5O2(g) –> 3CO2(g) + 4H2O(g) In an enclosed container with a volume of 2.25 L at a temperature of 322 K. If 12.1 grams of propane is burned in the presence of 10.2 atm of oxygen at the above temperature and volume conditions, determine the theoretical yield of H2O in grams.

The alcohol in “gasohol” burns according to the following equation: 2CH3OH + 3O2 –> 2CO2 + 4H2O a. How many grams of H2O are produced when 25.0 g of CH3OH is burned?

S 2- , K+ , and Ti 4+ can be considered isoelectronic in their valence shell.