15. How many atoms of helium are there in 2.0 grams of He?plz answer as soon as possible

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How to convert a density of 0.791g/cm3 to lb/ft3

Given the following information: mass of proton = 1.00728 amu mass of neutron = 1.00866 amu mass of electron = 5.486 × 10^-4 amu speed of light = 2.9979 × 10^8 m/s calculate the nuclear binding energy (absolute value) of 3li^6. which has an atomic mass of 6.015126 amu. j/mol.