Combustion of 0.246 g of an organic compound, CxHyNz, yields 0.656 g CO2, 0.134 g H2O, and 1.86 × 10−3 mol N2 gas. What is the empirical formula of the compound?

This is Section 1 of the Exam. Please answer all 19 questions (150 points)

Which of the following reactions will not produce a precipitate?

Which of the following is equivalent to 1 × 10−5 cm?

The magnesium element has three stable isotopes: Mg-24 with mass 23.98504 amu is 78.99% abundant, Mg-25 with mass 24.98584 amu is 10.00% abundant; and Mg-26. The mass of Mg-26 is closest to:

A modern U.S. penny contains 2.5% copper by mass, with the rest being primarily zinc. If a penny has a total mass of 2.50 grams, how many atoms of copper are in 50 cents worth of pennies?

Tetraphosphorus hexaoxide (MM = 219.88 g/mol) is formed by the reaction of phosphorus with oxygen gas: P4(s) + 3 O2(g)  →  P4O6(s)       If a mixture of 75.3 g of phosphorus and 38.7 g of oxygen gas produce 43.3 g of P4O6, what is the percent yield for the reaction?  

Based on class discussion, the county chair is selected by the _________________, while the _______________ selects the state chair and vice chair.

Primaries are held in

In Texas, how much can an individual donate to a campaign for a state-level, nonjudicial office, such as for governor?