Answer:
One of the most common methods used today to determine the composition of stars is <u>spectroscopy</u>.
Explanation:
Spectroscopy is the study of the interaction between matter and electromagnetic radiation as a function of the wavelength or frequency of the radiation.
Answer:
27.2 a.m.u
Explanation:
Isotope of an element is its tendency to exist in two or more forms. Thus, the average atomic mass of the element is required. And this can be calculated by adding the individual product of the percentage isotope and its mass.
The average atomic mass of the element can be determined by:
= (70% x 26) + (30% x 30)
= (0.7 x 26) + (0.3 x 30)
= 18.2 + 9
= 27.2
Thus, the average atomic mass of element X is 27.2 a.m.u
Answer:
.371 mole of NaCl
Explanation:
Na Cl Mole weight = 22.989 + 35.45 = 58.439 g/mole
21.7 g / 58.439 g/mole = .371 mole
Each nucleotide triplet in mRNA that specifies a particular amino acid is called an mRNA codon.
8O
the electron configuration for oxygen is 1s2 2s2 2p4