The mass of an atom may be determined by adding the masses of the protons and neutrons in the nucleus. why is it unnecessary to include the electrons when determining the mass of an atom?

In pea plants, the allele for tallness (t) is dominant to the allele for shortness (t). in the cross between a tall pea plant and a short pea plant shown below, what is the probability that the resulting offspring will be tall? whats the percent

How many grams of oxygen gas are contained in a 15 l sample at 1.02 atm and 28°c? show your work.

How many molecules are in 6.0 moles of methane