Which solution of eathanol and water has a mole fraction of eathanol equal to 0.25?

Which of the following statements is not true? • a. covalent compounds have low melting and boiling points. • ob. covalent bonds between atoms of a compound are relatively weak compared to bonds between molecules. • c. covalent bonds occur between nonmetals. • d. covalent compounds are often gases or liquids.

Which of the following compounds does not contain molecules? question 2 options: co2 h2 nacl h2o

The molar mass of cu is 63.55 g/mol. the number of grams of cu produced in this reaction is