How many moles of PbS are equivalent to 458 g PbS?

A carbon dioxide fire extinguisher is the best choice if an electric clothes dryer is on fire. Why would a water extinguisher not be stable for the clothes dryer fire?

What is the ratio of ions needed to produce neutral potassium chloride

How many time zones are there in the continental united states

In one experiment, the reaction of 1.00 g mercury and an excess of sulfur yielded 1.16 g of a sulfide of mercury as the sole product. In a second experiment, the same sulfide was produced in the reaction of 1.56 g mercury and 1.02 g sulfur.

Calculate ∆h0 for the reaction 2 n2 (g) + 5 o2 (g) - → 2 n2o5 (g) given the data h2 (g) + 1 2 o2 (g) - → h2o (ℓ) ∆h 0 f = - 283.7 kj/mol n2o5 (g) + h2o (ℓ) - → 2 hno3 (ℓ) ∆h0 = - 78.

Copper (cu) is a transition element used in the making of coins. calculate the mass in grams of 0.0420

In 1864, the Solvay process was developed to make soda ash. One step in the process is represented by the balanced equation below.

A chemist must prepare of aqueous potassium permanganate working solution. He'll do this by pouring out some aqueous potassium permanganate stock solution into a graduated cylinder and diluting it with distilled water.

What is the best name for the molecule below? a compound with 10 total carbons with a double bond and the rest single bonds.

What Word means the gradual change and build up of organisms in an enviroment