The atomic mass unit is defined as 1/12 of the mass of a carbon 12 atom, and 1 atomic mass unit has a mass of 1.6605 x 10⁻²⁴ g. It follows that one carbon atom has a mass of 12 x 1.6605 x 10⁻²⁴ and thus the number of carbon atoms in present in 12 g of carbon equal 12 / (12 x 1.6605 x 10⁻²⁴) which equals 6.02 x 10²³.True / False.

Any info on neptunes spot? i need it for a project.

To find the enthalpy of a reaction in the lab, you measured the of the reactants and the change during the reaction.

For questions 1 and 2, consider the following experimental data.hydrogen emission lines were detected at the following wavelengths (in nm): 121.6102.697.395.093.8question 1use the electromagnetic radiation classifications below and figure 1-1 in the introductory information for this lab (in the lab manual) to determine the nf value for the experimental data provided? wavelength, ? (nm) 650 700 550 600 400 450 500 visible spectrum wavelength, ? (m) 11 10 3 10 10 10 8 10 5 10 10 -10 10 9 10 10 10 10 -12 10 microwave radio infrared x-ray ultraviolet gamma 1020 1019 1018 1 1016 015 1014 01 12 109108 frequency, v (hz)a.1b. 2c. 3d. 4e. 5question 2using the data for the emission line with the longest wavelength, the known value of nf (from question 1 in this prelab), and the value of ni (deduced from the ? and nf values) calculate the rydberg constant for hydrogen (rh) in units of m-1.a) 1.097 x 10-11 m-1b) 5.921 x 107 m-1c) 1.097 x 10-2 m-1d) 9.252 x 106 m-1e) 1.097 x 107 m-1