General Chemistry Answers

Saline solutions are used in hospitals to replace lost body fluids and electrolytes. A normal saline solution is made by dissolving 0.9 g NaCl in 100 mL of water. Calculate its concentration as % by mass

Convert 80mL (4.03g) of acetic acid into moles of acetic acid

A chemist performed this reaction and obtained 45.5 g BaSO4. How much HCI

was also produced?

Molar masses: 233.4 g/mol BaSO4,

36.5 g/mol HCI

A. 9.49 g HCI

C. 5.35 g HCI

B. 388 g HCI

D. 7.12 g HCI

2 Al + 3 CuCl₂ → 2 AICI3 + 3 Cu

Molar masses: 27.0 g/mol Al,

134.5 g/mol CuCl2, 63.5 g/mol Cu

A: How many grams of CuCl₂ are

necessary to consume 10 g Al?

The percentage of nickel in the Ni/DMG precipitate is 20.32%. Using the atomic mass of Ni and the formula mass of DMG, derive the percentage.

Solid calcium oxide decomposes into elements

Which of the following correctly determines the mole fraction of 250. g sucrose (MM = 342 g/mol) dissolved in 1000mL of water?

Determine the mass of aluminum chloride formed when 25.0 g of aluminum hydroxide reacts with 50.0 g of hydrogen chloride.

To do: Identify the oxidizing agent and reducing agent in the reactions.

1. 2Na2S2O3+I2→Na2S4O6+2NaI

2. 2FeCl3+H2S→2FeCl2+S+2HCl

3. 3Mg+N2→Mg3N24.AgCN+CN−→[Ag(CN)2]−

To do: From the reactions above, identify the Bronsted-Lowry acid, Bronsted-Lowry base, the conjugate acid, and conjugate base.

No. Bronsted-Lowry acid Bronsted-Lowry base Conjugate acid Conjugate base

1

2