Extra Credit (3 point): A 15.0 g of a hydrated salt, Na2SO4 . xH2O was found to contain 7.50 g of water. Determine the empirical formula of the salt. Show all of your work.

Write the balanced molecular, complete ionic, and net ionic equations for calcium nitrate solution mixed with potassium carbonate. Indicate which if any of the products form a precipitate. [Don’t forget to include states of matter]. Show all of your work.

Saccharin has the molecular formula of C7H5NO3S. How many molecules of Saccharin can be prepared from 30 C atoms, 25 H atoms, 12O atoms, 8 S atoms, and 14 N atoms? Show all of your work.

This organism is distributed worldwide, but is especially prevalent in areas heavily contaminated with bird and bat guano.

Dimorphic fungi grow in the ___________ form at _________ and ___________ form at __________+

The best way to definitively identify a fungus causing a systemic infection is…

Sporothrix schenckii

Select the correct coefficient for each compound to balance the reaction. Finally select the correct reaction the drop down for the type of reaction:  [coeff_na2co3]Na2​CO3 + [coeff_crno3]Cr(NO3​)3 –> [coeff_crco3]Cr2(CO3​)3 + [coeff_nano3]NaNO3​?   Type of reaction: [rxn_type]   Note: If a coefficient is ‘1’ then don’t leave it blank as would on paper – enter ‘1’.

How many grams of NaOH are needed to prepare 250 mL of a 1.0 M solution? 

Determine the molecular formula of a compound with an empirical formula of CH2O and a molar mass of 180.0 g/mol.