A sample of gas is collected at 306. K and 740. mm of Hg has a mass of
.390 grams and a volume of 350. mL. What is its molar mass? (Hint:
convert units)

A. 25.8 g/mol
B. 78.9 g/mol
C. 28.8 g/mol
D. 45.8 g/mol

Covalent network solids typically have melting points and boiling points. the chemical formula of a network solid indicates in the molecule.

How many atoms are there in 5.70 mol of mg

Insoluble sulfide compounds are generally black in color. which of the following combinations could yield a black precipitate? check all that apply. na2s(aq)+kcl(aq) li2s(aq)+pb(no3)2(aq) pb(clo3)2(aq)+nano3(aq) agno3(aq)+kcl(aq) k2s(aq)+sn(no3)4(aq)