Inorganic Chemistry I

Stoichiometry

100

What is the density (in g/mL) of a sample of mineral oil if 250 mL has a mass of .23 kg?

0.92 g/mL

400

Write the equation for the combustion of methanol, CH₃OH (l). What mass of methanol is combusted in a reaction that produces 5 mol of CO₂ gas?

160 g

500

3.9104 g sample of a compound made of carbon, hydrogen, nitrogen, and oxygen is burned completely. 3.820 g CO2 and 3.125 g H2O are produced. Analysis of nitrogen showed that the compound contains 46.62 % by mass nitrogen. The molar mass of the compound is about 170 + 15 g/mole. Find the molecular formula of the compound.

C4H16N6O2

Formulas/Equations

100

Name this compound: PbHPO₄

Lead (II) monohydrogen phosphate

200

Write the chemical equation for the decomposition of magnesium carbonate.

MgCO₃ (s) → MgO (s) + CO₂ (g)

300

Write the chemical equation for:

Oxalic acid and sodium hydroxide.

H₂C₂O₄(aq)+2NaOH(aq) → Na₂C₂O₄(aq)+2H₂O(l) 

 

   

           

400

Balance the following equation:

___ H₃PO4 + ___ KOH --> ___ K₃PO₄ + ___ H₂O

1 H₃PO₄ + 3 KOH --> 1 K₃PO₄ + 3 H₂O

500

Find the number of moles and the mass (in g) of sodium nitrate, NaNO₃, required to decompose and produce 128 g of diatomic oxygen, where NaNO₂ is the other product.

2NaNO₃→2NaNO₃+O₂

8 mol NaNO₃

680 g NaNO₃

Gases

100

What are the STP conditions for gas calculations?

0 degrees Celsius and 1 atm

200

What is the molar volume of a gas at STP?

22.4 L/mol

300

What mass of NO2 is contained in a 13.0 L tank at 4.58 atm and 385 K?

86.7 grams

Conversions

100

In metric units, "n" corresponds to this power of ten. (Ten to the ___?)

-9

200

Which weighs more: 1 dg or 1 dag?

1 dag 

(1 dag = 10 g) > (1 dg = 0.1 g.)

300

7.89 m³ corresponds to what volume, in L?

7.89 x 10³ L

400

A length of glass tubing is 0.525 m. How many inches long is the tubing? (2.54 cm = 1 inch)

20.7 inches

500

You have a terrible fever, and your thermometer tells you your temperature is 40.32°C. Unfortunately, you are American and have no idea what this means. Convert to Fahrenheit.

104.6°F! You survived to seek medical attention at the emergency room. (A core body temperature above 109.4°F is normally fatal.)

General

100

Name 5 strong acids and 5 strong bases.

Answers may vary.

200

What metals are typically not soluble with halides? (I^-, Br^-, Cl^-)

Lead, Silver, Mercury

300

Is (10² / 10^-2) less than, greater than, or equal to 1?

Greater! Negative exponents in the denominator make the number bigger.

(x big number) or (÷ small number) --> BIG number

(x small number) or (÷ big number) --> small number