A fictitious element X is composed of 15.0% of the isotope X-51, 15.0% of the isotope X-52, and 70.0% of the isotope X-53. Estimate the atomic mass of element C

What is the molality of a solution that contains. 500 mol hc2h3o2 and 0.125 kg h2o?

Which would increase the amount of dissolved oxygen in a pond? A. Removing plants. B. Removing fish. C. Adding plants. D. Both B and C are correct.

3Fe+4H2O (yields) Fe3O4+4H2. What is the mole ratio of Fe3O4 to Fe? A - 1:3 B - 1:4 C - 3:1 D - 4:3

Which one of the following groups consists of one mixture, one element and one compound? 1. Aluminium, water and nitrogen gas 2. Aluminium, steel and air 3. Air, water and iron oxide 4. Calcium, soil and sodium chloride

In a Lewis dot diagram, the electrons shown * a) Are in the innermost energy level b) Always equal the number of protons c) Are in the outermost energy level d) Always add up to an even number

Write the outer electron configuration for the group 15 element in the fourth period.

Describe the relationship between transmittance and the absorbance?

Are the following statements true or false? A. Two pi bonds comprise a double bond. B. Bonds formed from atomic p orbitals are always sigma bonds. C. Side-to-side overlap results in a bond with electron density above and below the bond axis. D.

Does beryllium or sodium have the same inside electron arrangement as magnesium

How do carbohydrates relate to organic chemistry