Other Chemistry Answers

A gas filled a 5 dm³ container at a pressure of 3.0 atm, at 301 K. If the pressure of the system is doubled, what is the new volume that the gas will occupy at 301 K?

A gas at 40^oC, occupies a volume of 60 cm³ . What volume would the same gas occupy at 55^oC, at the same pressure?

Using the kinetic particle theory, describe the interconversion between the three physical states of water.

An organic compound, in liquid form, comprises of 59.2% C, 13.6% H and 27.2% O, by mass; and has a molar mass of 60 gmol^-1 . (RAM: C = 12; H = 1; O = 16) Determine the:

i. Empirical formula of the compound, (4 marks)

ii. Molecular formula of the compound. (2 marks)

iii. Balanced chemical equation, with the correct physical states, when the molecule from C ii. above is reacted with oxygen to give carbon dioxide and water

The electrolytic manufacture of chlorine gas from a sodium chloride solution is carried out by the following reaction: 2 NaCl + 2 H2O → 2 NaOH + H2 + Cl2 How many kilograms of Cly can be produced from 10 m3 of brine solution containing 5% by weight of NaCl? The specific gravity of the solution relative to that of water at 4°C is 1.07. ** Assuming complete converson of NaCl Atomic mass: Na: 23 Cl: 35.5 0:16 H: 1

1. Questions 8 to 12—convert the following number of moles to number of particles:
2. 2.0 moles of CaCl₂
3. 1.5 moles of copper(II) ions
4. 0.01 moles of H₂O
5. 5.0 moles of gold atoms
6. 0.0025 moles of HCl
7. What is the mass of 1 mole of Mg atoms?
8. What is the molar mass of aluminum?
9. What is the mass of 1 mole of oxygen atoms?
10. What is the mass of 1 mole of oxygen molecules, O₂?
11. Calculate the molar mass of NaOH.
12. What is the mass of 1.0 mole of CaCl₂?
13. Calculate the molar mass of Cu(NO₃)₂.
14. Calculate the molar mass of Al₂(SO₄)₃.

how many grams of Cl₂ would you need to produce 234 grams of NaCl

How many grams of oxygen are required to burn 13.50 grams of acetylene, C2H2

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1. Explain;

a) Molecular absorption

(2 marks)

b) Nonradiative relaxation

(2 marks)

c) Fluorescence

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