Calculate the change in energy requiredto convert 250. g of substance X from a gas at 121°C to a solid at - 49.0°C. Assume X has molar mass = 75.0 g/mol. Also, substance X has the following properties:

In electroplating, how should the object that will be plated be connected in the electrolytic cell? It should be the cathode, where metal atoms are reduced to metal ions. It should be the cathode, where metal ions are reduced to metal atoms.

What are the two types of solids? Give examples of each

How do u circulate netforce

Amyx is building a treehouse in his backyard. He notices that every time he strikes a nail with the hammer, the hammer bounces back just a little bit as the nail goes farther into the wood.

Which is colder dry ice or dioxide gas

A gamma ray has a very high frequency of about 1019 s-1. what is the wavelength of the gamma ray?

What is the first quantum number of a 1s2 electron in phosphorus, 1s22s22p63s23p3?

What are two objects used to find density

How many helium atoms are there in a helium blimp containing 537 kg of helium? express the number of helium atoms numerically?

Which of the following is a physical of a substance A. Reactivity B. Hardness C. Flammability D. Toxicity