What is the mass of 4.23×10^23 atoms of iron

A5.00 g of a in . g of at aa 5.00 g of b in . g of .?at .

An unknown substance has been shown to have metallic bonds. which of the following is most likely a property of this substance? a. low conductivity b. low boiling point c. high malleability d. high solubility in water

Agas engine that operates on a brayton cycle has an efficiency of 0.23. on a cold day, the temperature of the air drawn into the engine is 267 k.part awhat is the temperature of the air exhausted from the engine?