CHEM1011/1021 Mastery Exam 1 Review

What is the chemical name for the formula (NH4)2C2O4·3H2O?

What is the correct chemical formula for iron(II) perchlorate?

Calculate the mass of methane (CH4) present in a sample containing 9.26x10^24 atoms of hydrogen.

What is the concentration of sodium ions in a 19.8 mL stock solution of 5.59 M sodium oxalate after adding 480 mL of water?

What is the chemical name for the compound with the formula Ca(IO3)2?

Chemical Names and Formulas

Ammonium oxalate trihydrate is represented by the formula (NH4)2C2O4·3H2O.
Calcium iodate corresponds to the formula Ca(IO3)2.

Chemical Formulas from Names

Iron(II) perchlorate is denoted by the formula Fe(ClO4)2.
Copper(II) chloride pentahydrate is expressed as CuCl2·5H2O.

Mass Calculation of CH4

To find the mass of methane (CH4) with 9.26x10^24 hydrogen atoms, use the relationship of moles and Avogadro's number (6.022x10^23 atoms/mole).
Each molecule of CH4 contains 4 hydrogen atoms; calculate moles of CH4 accordingly and then determine mass using its molar mass (16.04 g/mol).

Sodium Ion Concentration

A 19.8 mL stock solution of sodium oxalate has a concentration of 5.59 M.
Upon diluting with 480 mL of water, calculate the new sodium ion concentration using the dilution formula (C1V1 = C2V2).
The total volume after dilution will be 19.8 mL + 480 mL = 499.8 mL.

By applying the dilution equation, determine the effective concentration of sodium ions in the final solution.

Prepare for your CHEM1011/1021 Mastery Exam 1 with this comprehensive review quiz. The questions include identifying chemical names from formulas and vice versa, as well as calculating mass based on atomic quantities. Test your understanding of fundamental chemistry concepts and get ready for exam success!