How is the molar mass of an element determined?

The average atomic mass of a sample of an element X is 16.2u. What are the percentages of isotopes X (mass number 16, atomic number 8) and X (mass number 16, atomic number 8) in the sample?

Which example shows a community of organisms? A. a single monkey B. a group of tree monkeys C. a group of tree monkeys and a cluster of trees D. a group of tree monkeys, a cluster of trees, a pile of rocks, and a fierce wind

In a neutralization reaction, an aqueous solution of an Arrhenius acid reacts with an aqueous solution of an Arrhenius base to produce A) an ether and water B) an ether and an alcohol C) a salt and water D) a salt and an alcohol

11. Name the following Ionic Compounds (Including roman numerals where appropriate). a. CaF2 b. (NH4) 2CrO4 c. K2CO3 d. NaCl e. PbOf. CuSO4 g. Ca (NO3) 2 h. Mg (OH) 2i. SnO2

What is required to move from one state or phase of matter to the next

4. What structural characteristics do all hydrogen atoms have in common?

Which of the following would be a result of increased solar activity? A. Longer winters B. Warmer-than-normal sea surface temperatures C. Colder-than-normal sea surface temperatures D. Shorter summers

The electron configuration of an element is 1s22s22p63s23p64s1. why is this a representative element?

Why is scientific notation important in chemistry?

During translation, the new polypeptides are often directed to specific parts of the cell by the presence or absence of short sequences of amino acids called signal sequences.