Pls help
7. What is the wavelength of X-rays having a frequency of 8.40 x 10^20 Hz?

What is the independent variable in this investigation? mass volume sample number substance density

What is the mass of 0.46 mol of mgcl2

He table below gives the atomic mass and relative abundance values for the three isotopes of element m. relative abundance (%) atomic mass (amu) 78.99 23.9850 10.00 24.9858 11.01 25.9826 what is the average atomic mass (in amu) of element m? 2.86 5.36 24.30 24.98