An atom with 7 protons, 6 neutrons, and 7 electrons has an atomic mass of amu. (Enter a whole number.) (Please help I need answers ASAP!!! <3)
13 points!

50 pts plz what is the physical state of matter of baking soda.

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.

Use the de broglie's wave equation to find the wavelength of an electron moving at 7.3 × 106 m/s. show your work. note: h = plank's constant (6.62607 x 10-34 j s)