An 18 -karat gold necklace has a density of 15.5g/cm3 and contains 16.0% silver by mass. What is the volume of this necklace (in cm3 ) if it contains 6.80g of silver? How many kJ of heat are required to heat 242g of carbon from 23.6C to 54.2C ? (Specific heat of carbons is 0.710J/gC ) A fictional element named Nivadium is found to have three naturally occurring isotopes with the natural abundances shown below: Based on this information, calculate the atomic mass of Nivadium