A chemistry student needs 85.0mL of chloroform. By consulting the CRC Handbook of Chemistry and Physics, the student discovers that the density of chloroform is 1.48 g•cm^-3. Calculate the mass of chloroform the student should weigh out.

it's c. elements are placed in rows based on how may valencies electrons have.

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer