Balance the following equation by adding the correct mole numbers. __P4 + __C12 → __PCl3

What is the complete ground state electron configuration for the selenium atom?

Zirconium has 5 stable isotopes as shown below. Determine the % abundance of zr-92: isotope mass (amu) % abundance zr-90 89.905 51.45 zr-91 90.906? Zr-92 91.905? Zr-94 93.906 17.38 zr-96 95.908 2.80

In an ecosystem, when a new organism is introduced and has no predators, what will happen to the new organism? a. become a predator b. become extinct c. overpopulate d. adapt

What is the main difference between the formulas for kinetic energy (KE) and gravitational potential energy (PE) ?

Determined that all animals were mad of cells

Assume 3 molecules of Fe react according to the following equation. 3Fe + 4H2O Fe3O4 + 4H2 How many molecules of H2 are produced? How many water molecules are required? What is the mole ratio of Fe to H2O?

10.0 mL of a HF solution was titrated with a 0.120 N solution of KOH; 29.6 mL of KOH were required to completely neutralize the HF. Calculate the normality of the HF solution.

The number of grams present in 1.35 mol of Fe is

Which can associate a suspect's gun with a crime?

In which era did the first fish appear? a. Carboniferous b. Paleozoic C. Mesozoic d. Permian