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Stoichiometry & Conversions (Cheeky)
Mixed
100

Balance the Equation:

 C6H6  +    O6  -->    CO2  +    H2O  

2 C6H6  +   15 O6  -->   12 CO2  +   6 H2O  

100

What is the empirical formula of a compound comprised of Zn2+ and N?

Zn3N2

200

Convert the following density to oz/nm3

1.23 g/mL

1 oz = 28.3 g

1 m = 109 nm

1 m = 102 cm

4.34 x 10-23 oz/nm3

200

Solve for the answer with the correct amount of significant figures and unit.

(2.34 atm)(1.7 L + 2.33 L) = n(0.0821 ((L*atm)/mol*K))) * 298 K

n = 0.38 mol

300

A sample of Fe2(SO4)3 has a mass of 48.6 grams. How many atoms of oxygen are in the sample?

8.78 x 1023 atoms O

300

Cl-35 has an atomic mass of 34.97 amu and Cl-37 has an atomic mass of 36.97 amu. What is the percent abundance of the lighter isotope?

75.77%

400

A 3.672 gram sample containing C, N, & H is determined to have 1.848 g C and 0.308 g H. What is the empirical formula of the compound?

C3H6N2

400

When Iron and Oxygen gas react to form Iron (III) Oxide, where the percent yield is 73% and the product collected is 38.5 grams, how much Iron was used in the initial reaction?

36.88 grams Fe2O3

500

How many grams of excess reagent (excluding C) is produced when 23 grams of Ca3(PO4)2 reacts with 30 grams of SiO2 with excess C?

Ca3(PO4)2  +   3SiO2  +  5C  -->   3 CaSiO3  +  5 CO  +   2P

16.63 grams of SiO2

500

Which of the following are salts?

NH4NO3

KO2

NaHCO3

Li3N

NH4NO3 & NaHCO3