What is the isotope with 50 protons, 68 neutrons, and 50 electrons?

How do I calculate moles?

Given: Q1 = + 10 µc = 1.0 x 10-5C Q2 = - 15 µc = - 1.5 x 10-5 C K = 9.0 x 109 N·m2/C2 r = 6.0 m

Which of the following is a cation A. li+1 B. Li C. cl-1 D. cl

A mining company is interested in monazite, a mineral substance that forms in igneous rock in Earth's interior. They think they found a lot of monazite in a sedimentary rock formation at Earth's surface.

HI + 2 KMnO4 + 3 H2SO4 - -> 5 I2 + 2 MnSO4 + K2SO4 + 8 H2O55. According to the balanced equation above, how many moles of HI would be necessary to produce 2.5 mol of I2, starting with 4.0 mol of KMnO4 and 3.0 mol of H2SO4? A) 20B) 10C) 8.0D) 5.0E) 2.

Which of the following sentence best describes a buffer? A. Buffer is A substance that resists small change in the acidity of a solution when an acid or base is added to the solution. B.

Hydrogen and oxygen bond to form water. What is the chemical formula for each of these reactants? A. H and HO B. O and HO C. H and O D, HO and O

Which molecules would most likely cause a liquid to have the lowest viscosity? large, polar molecules small, nonpolar molecules small, polar molecules large, nonpolar molecules

8. Calculate the percentage composition of sodium nitrate, NaNO3.

What is the structural formula of 2-methylbutan-2-ol (sometimes called 2-methyl-2-butanol) ?