The atomic and mass numbers for four different atoms are given below. Which two are isotopes?

Atom Atomic# Mass#

W 50 117

X 50 119

Y 51 119

Z 52 117

How many moles of O2 are needed to react with 24 moles of C2H6?

A substance having low specific heat capacity gets heated faster than another one with equal mass and having high specific heat capacity, why?

A mixture of three noble gases has a total pressure of 1.25 atm. The individual pressures exerted by neon and argon are 0.68 atm and 0.35 atm, respectively. Wha t is the partial pressure of the third gas, helium?

You make an iron (II) sulfate solution with a molarity of 2.1 M. If the solution is 500 mL total, how many grams of iron (II) sulfate is that?

Diseases that are inherited are caused by

Which trends are observed when the elements in Period 3 on the Periodic Table are considered in order of increasing atomic number? (1) The atomic radius decreases, and the first ionization energy generally increases.

The enthalpy of formation of MX is ΔHf° = - 525 kJ/mol. The enthalpy of sublimation of M is ΔHsub = 139 kJ/mol. The ionization energy of M is IE = 437 kJ/mol. The electron affinity of X is ΔHEA = - 313 kJ/mol. (Refer to the hint).

Which group of elements could you not use in making fireworks?

A 5.0 M solution of HCL in water has a proton concentration of _M

How many moles are in 25.5 grams of Silver, Ag?