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A 0.200-g sample of cobalt metal reacted with hydrochloric acid according to the following balanced chemical equation: Co (s) + 2 HCl (aq) ➝ CoCl2 (aq) + H2 (g) The volume of hydrogen gas collected over water was 87.

What is the oxidation number of sodium (na) in pure sodium, na?

Five standard solutions of HBr are prepared by serial dilution in which, at each stage, 10.00 mL are diluted to 150.00 mL. Given that the concentration of the most dilute solution is 2.

How many Valence electrons do the following atoms have Na Al N Ar

What is a phase diagram

To what chemical reaction class does this reaction belong? 2 mg (s) + o2 (g) 2 mgo (s)

Which best illustrates how particle arrangement changes when solids change into liquids

Express in scientific notation (6.0x10^4) (3.1x10^-1)

How do you measure the mass of a liquid?

Given the following information, calculate the mass for B-11. B-10 has a natural abundance of 19.9 percent, while B-11 has a natural abundance of 80.1 percent. The mass of B-10 is 10.013 amu.