The mass number of an isotope of uranium is 238, and its atomic number is 92. which symbol best represents this isotope of uranium?

Calcium hydride (cah2) reacts with water to form hydrogen gas: cah2(s) + 2h2o(l) → ca(oh)2(aq) + 2h2(g) how many grams of cah2 are needed to generate 45.0 l of h2 gas at a pressure of 0.995 atm and a temperature of 32 °c?

Compare the valence electron configuration of the nobles gas elements seen here. what statement is correct?

0.09 moles of sodium sulfate in 12 ml of solution