CHEM 107 EXAM 2

Determine the quantity of moles in 3.40 × 10²² molecules of H₂O₂ 3.40 × 10²² mol H₂O₂

0.0565 mol H₂O₂.

How many moles of ammonia would be required to react exactly with 0.470 moles of copper(II) oxide in the following chemical reaction? 2 NH₃(g) + 3 CuO(s) → 3 Cu(s) + N₂(g) + 3 H₂O(g)

0.313 mol

Determine the number of moles in 3.50 × 10²³ formula units of BaCl₂.

0.581 mol - Since formula units of BaCl2BaClX2 was provided, that will be the starting point. Avogadro's number provides the conversion factor. multiply given to 6.022x1023

What quantity in moles of NaCl are in 72.0 grams of NaCl?

1.23 mol -given divided by g of molar mass NaCl

Aluminium has a density of 2.70 g/cm³. What quantity in moles of aluminum are in a 13.2 cm³ block of the metal substance?

1.32 mol Al

A particular vitamin's chemical formula has one cobalt atom. What is the molar mass of the vitamin if it contains 4.34% cobalt?

1358 g/mol

If 2.00 moles of H₂ and 1.55 moles of O₂ react how many moles of H₂O can be produced in the reaction below? 2 H₂(g) + O₂(g) → 2 H₂O(g)

2 mol

Determine the molar mass of a substance if 0.385 moles has a mass of 152 g.

395 g/mol - The molar mass is the mass of one mole of a substance in a molecule or formula unit. To calculate molar mass, divide the amount given (in grams) by the number of moles. - given g over mol= g/mol

What is the mass in grams of 36.70 moles of KBr?

4368 g - given mol times molar mass

If 4.9 kg of CO₂ are produced during a combustion reaction, how many molecules of CO₂ would be produced?

6.7 × 10²⁵ molecules

A 52 kg woman has 7.2 × 10⁻³ mol of hemoglobin (molar mass = 64456 g/mol) in her blood. What quantity of hemoglobin molecules is this?

7.2 mole hemoglobin*6.022x1023molecules hemoglobin/1 mol=4.3x1021 molecules hemoglobin

How many atoms are in 1.2 mol of carbon?

7.2 × 10²³ atoms - Use dimensional analysis to convert from moles of carbon to atoms of carbon using Avogadro's number as the conversion factor, 1 mol = 6.022×10236.022×1023 atoms. 1.2 mol C/6.022x1024

What mass (in grams) of aspirin (C₉H₈O₄) is produced from 57.6 g of C₇H₆O₃ assuming 95.0% yield from the reaction below? C₇H₆O₃ (s) + C₄H₆O₃ (l) → C₉H₈O₄ (s) + HC₂H₃O₂ (aq).

71.4 g

What is the mass percentage of C in morphine, C₁₇H₁₉NO₃? Provide an answer to two decimal places.

72.55%

Balance the following chemical equation (if necessary) for the combustion reaction of glucose: C₆H₁₂O₆(s)+9O₂(g)→6CO₂(g)+6H₂O(g)

C₆H₁₂O₆(s) + 6O₂(g) → 6CO₂(g) + 6H₂O(g)

Provide the correct IUPAC name for Br₂O.

Dibromine monoxide

Provide the correct IUPAC name for AlCl₃

aluminum chloride