Chemistry Answers

A metallic zinc tape is placed in a beaker containing 120 mL of a solution of copper (II) nitrate, Cu (NO3) 2 (aq). The copper produced has a mass of 0.813g. Find the initial concentration of the copper nitrate solution

define Solution

What is the equation to calculate concentration/molarity?

How many moles of NaCl will be in a 2.1 liter solution with a molarity of 0.1M?

The reaction 2 NO(g) reversible N₂ (g)+O₂(g) has a KC value of 2400 at 2000 K. If 0.850 M each of N₂ and O₂ are initially present in a 3.00-L vessel, calculate the equilibrium concentration of NO, N₂ and O_2.

NThe reaction 2

Phosphoric acid is a weak acid. If there are 1.32 × 10-2 mole of phosphoric acid present in 875 mL of solution

(i) Write the ionization reaction 

(ii) Calculate the concentration of hydrogen ions, [H+], in solution

(a) Calculate [OH-] in a solution containing 100.0 g of potassium hydroxide in 2.50 L solution. 

Give the balanced ionization reactions for the following weak acids and bases and write the Ka or Kb 

expressions for each:

(a) ascorbic acid

(b) boric acid

(c) methyl amine

A sample of helium occupies 535 ml at 988 torr and 25°C. If the sample is transferred to a 1.05 L flask at 25°C, what will be the gas pressure in the flask?

Activity # 1

1. You found a piece of copper metal weighing 3.10 g 

imbedded in an ice block. How much heat is absorbed by 

the piece of metal as it warms in your hand from the 

temperature of the ice block at 1.5 oC to your body 

temperature of 37.0 oC? The specific heat of copper is 

0.385 J/g- oC. Assume that the metal is pure coppe