The Debate on the Corpuscular Nature of Matter Do you know the debate going on for centuries about the corpuscular nature of matter? An ancient Greek philosopher, Empedocles, thought that all materials are made up of four things called Read More …
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Archimedes and His Discovery (Chemistry 9th)
Archimedes and His Discovery Q1: Who was Archimedes, and what task did the Greek emperor assign to him? A1: Archimedes was a Greek philosopher, mathematician, and inventor of war machines. The Greek emperor tasked him with determining whether his Read More …
Fundamentals of chemistry
Overview of Chemistry Chapter What are the simplest components of wood, rocks, and living organisms? This is an age-old question. Ancient Greek Philosophers believed that everything was made of an elemental substance. Some believed that substance to be water, others Read More …
Calculate the number of molecules present in each of the following samples with number of moles
Calculate the number of molecules present in each of the following samples: 5 moles of carbon dioxide 4 moles of ammonia, NH3 09 moles of benzene, C6H6 01 moles of acetic acid, CH3COOH Calculate the Number of Molecules Read More …
Calculate the mass in grams of each of the following samples in moles
Calculate the mass in grams of each of the following samples: a. 1.2 moles of K b. 75moles of H2 c. 0.25 moles of steam d. 1.05 moles of CuSO4.5H2O e. 0.15moles of H2SO4 Step-by-Step Mass Calculation Sample a: Read More …
Calculate the number of moles of each substance in samples with the following masses: a. 2.4 g of He b. 250mg of carbon c. 15g of sodium chloride d. 40g of sulphur
Calculating Moles of Substances Step 1: Understand the Problem We want to calculate the number of moles for different substances based on their given masses. Step 2: Use the Formula The formula to calculate the number of moles Read More …
Basic Definitions in Chemistry
Chemistry Definitions Chemistry Chemistry is the science of materials of the universe. Physical Chemistry The branch of Chemistry that deals with laws and theories to understand the structure and changes of matter is called Physical Chemistry. Organic Chemistry Organic Read More …
2. A method used to prevent rusting in ships and underground pipelines involves connecting the iron to a block of a more active metal such as magnesium. This method is called cathodic protection. How many moles of magnesium are present in 1 billion (1 x 109) atoms of magnesium
How to Calculate Moles of Magnesium Step 1: Understand the Problem To prevent rusting in ships and underground pipelines, a method called cathodic protection is used. This method involves connecting iron to a block of a more active metal, Read More …
1. Aspirin is a compound that contains carbon, hydrogen and oxygen. It is used as a painkiller. An aspirin tablet contains 1.25 x 1030 molecules. How many moles of this compound are present in the tablet?
How to Calculate Moles of Aspirin in a Tablet Step 1: Understand the Problem Aspirin is a compound used as a painkiller, and we want to find out how many moles of aspirin molecules are present in a tablet. Read More …
Formaldehyde is used to preserve dead animals. Its molecular formula is CH2O. Calculate the number of moles that would contain 3.011 x 1022 molecules of this compound.
Mole Calculation Mole Calculation Given: Number of molecules = 3.011 x 1022 Formula of formaldehyde: CH2O Step 1: Find the molecular weight (molar mass) of CH2O. Molar mass of C (carbon) = 12.01 g/mol Molar mass of H (hydrogen) = Read More …