Element X consists of two isotopes with masses of 62.9 and 64.9.

The relative atomic mass of the element is 63.6. The percentage

abundance of the lighter isotope is closest to -

Select one:

-65%

-55%

-35%

-45%

How do chemical weathering and physical weathering affect each other?

Identify each definition that applies to the compound in red. Check all that apply. H2PO3-+HNO3 H3PO3+NO3- Arrhenius acid Bronsted-Lowry acid Arrhenius base Bronsted-Lowry base

The table below gives air temperature data over land and over the sea for six successive hours labeled A through F. What weather event is occurring around time D?

Which item below is NOT an example of how the general rule for dissolving works?

Electromagnetic waves are classified into forms such as radio waves, microwaves, and infrared waves, based on the amount of energy they carry. Which property of an electromagnetic wave determines the level or amount of energy it carries

The activation energy for the reaction no2 (g) + co (g) ⟶no (g) + co2 (g) is ea = 100 kj/mol and the change in enthalpy for the reaction is δh = - 375 kj/mol.

What process transform solar energy into chemical energy?

When the reaction was carried out the calculated theoretical yield for water was 176 grams but the measured yield was 148 grams what is the percent yield

For an atom's electrons, how many energy sublevels are present in the principal energy level n = 4?

Attempt 2 A sample of gas contains 49.16 % N 2 gas, 19.85 % Br 2 gas, 9.95 % CO 2 gas, and 21.04 % of an unknown gas. The average atomic mass of the gas mixture is 50.71 u. Calculate the atomic mass of the unknown gas.