Assuming ideal behavior, what is the volume occupied by 0.250 mol of air at STP?

The temperature of a 25.0-g block of metal increases from 25.0°C to 469.4°C after it absorbs 10.0 kJ of heat. What’s the specific heat of the metal?

What is the formal charge on the N atom in the following Lewis structure?

In the reaction, Fe (s) +   2 HCl (aq)   →   FeCl2 (aq)  +   H2 (g) _________ is the oxidizing agent.

In the reaction, Fe (s) +   2 HCl (aq)   →   FeCl2 (aq)  +   H2 (g) _________ is the reducing agent.

What is the theoretical yield of Fe2O3 (molar mass: 159.7 g/mol) when 60.0 g of Fe (molar mass: 55.85 g/mol) reacts with excess amount of O2? 4 Fe (s)  +  3 O2 (g)  –> 2 Fe2O3 (s)

What is the oxidation number of sulfur (S) atom in the following compound, Na2S2O3?

How many carbon atoms are found in 10.0 g of C2H6 (molar mass: 30.07 g/mol)?

Which of the following is the correct Lewis structure of HCN?

Which of the following are isotopes of the same element? Note that the letter Z does NOT represent the element symbol. I. II. III.