Author: Anonymous

A total of 130 people had their body temperature tested. The subjects were grouped based on if they were men (M) or women (W) and if they had a high (H) or low (L) pulse rate. This gives four groups of people: MH, ML, WH, WL. What distribution (and degrees of freedom) would be used to test if mean body temperatures for these four groups are equal?

A 1.000 g sample of an unknown compound containing only carbon, hydrogen, and oxygen was analyzed through combustion analysis and yielded 2.224 g of CO₂ and 0.3035 g of H₂O. What is the compound’s empirical formula?

Safrole, one of the flavor molecules in sassafras, contains only C, H, and O. Combustion of 10.0 g of safrole produces 27.13 g of CO₂ and 5.555 g of H₂O. Determine the molar mass of the compound if it is between 150.0 and 220.0 g/mol. Provide an answer to four significant figures.

The oxidation number of aluminum in Al³⁺ is:

How many molecules are in 25.8 moles of CO₂? Enter answer as X.XXEXX for scientific notation.

In the reaction between HNO₃ and Ba(OH)₂ (assume complete reaction of the Ba(OH)₂), the spectator ions are:

If 365 mL of 0.285 M MgCl₂ is added to 235 mL of 0.215 M (NH₄)₃PO₄, how many moles of Mg₃(PO₄)₂ precipitate will be formed? The balanced equation is:  

What is the oxidation number of S in the compound Na₂S₂O₅?

Determine the molar mass of C₆H₁₂O₆. Provide an answer to two decimal places.

65.0 mL of 0.250 M LiCl is added to a 1.000 L volumetric flask and the flask is filled with water. Calculate the [Li⁺] concentration in the diluted solution.