Which of the following is true regarding the atoms involved in a chemical reaction?

What’s the scientific notation for the number 6,840,000,000

The blackbody curve for a star name zeta is shown below. what is the peak wavelength for this star ?

Ican determine the molar mass of an element by looking on the under the atomic mass for the element. for example the molar mass of phosphorus is 30.974 grams/mole. avogadro’s number tells me the amount of representative particles in 1 mole of any substance. this means 12.011 gram sample of carbon and a 32.0 gram sample of sulfur have the same number of atoms.