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CopyChemistry
  • Stoichiometry

Stoichiometry 18: How many moles of water are produced when 2.5 moles of propane combust with excess oxygen?

moles of water from propane combustion

Introduction Have you ever cooked on a gas grill or watched a propane heater in action? What you witnessed was a real-life combustion reaction taking place. In chemistry, combustion reactions are more than just dramatic flames—they are balanced chemical processes


  • copychemistryadmin
  • June 24, 2025
  • Stoichiometry

Stoichiometry 12: How Many Grams of Water Are Produced When 170 Grams of Ammonia React with Excess Oxygen?

Grams of Water from Ammonia

IntroductionTo illustrate, here’s a practical scenario:In an industrial chemical reaction, you’re starting with a known mass of ammonia. You want to predict how much water will be formed when it reacts with excess oxygen. Furthermore, this isn’t just a classroom


  • copychemistryadmin
  • June 24, 2025
  • Stoichiometry

Stoichiometry 4: Finding the number of moles of oxygen needed to completely react with 5 moles of hydrogen

Oxygen Needed for 5 Moles of Hydrogen

Here’s something interesting:Aluminum is used in the aerospace industry not just for building planes but also for generating hydrogen gas on demand. But how do scientists know exactly how much aluminum they need to produce a specific amount of hydrogen


  • copychemistryadmin
  • June 24, 2025
  • Stoichiometry

Stoichiometry 17: How Many Moles of Oxygen Are Needed to React with 4 Moles of Magnesium?

moles of oxygen needed

Let’s set the scene. You’re working on a chemistry problem, and the question seems deceptively simple: “How many moles of oxygen are needed to react with 4 moles of magnesium?” At first glance, it feels like a basic plug-and-play task.


  • copychemistryadmin
  • June 23, 2025
  • Stoichiometry

Stoichiometry 19: How many moles are present in 1.5 grams of calcium chloride (CaCl₂)?

moles in CaCl₂

You’d be surprised how much chemical insight can be hidden in just a few grams of a compound. For instance, what if you were handed 1.5 grams of calcium chloride (CaCl₂) in a lab and asked, “How many moles is


  • copychemistryadmin
  • June 23, 2025
  • Stoichiometry

Stoichiometry 20: How many moles are present in 15 mL of 0.1 M AgNO₃ solution?

moles in AgNO₃ solution

You ever poured a tiny amount of a solution into a test tube and wondered, “How much actual substance is in here?” Well, that’s what today’s question tackles. You’re working with a silver nitrate solution—only 15 milliliters of it. But


  • copychemistryadmin
  • June 21, 2025
  • Stoichiometry

Stoichiometry 21: What is the limiting reagent when 1.5 g of CaCl₂ reacts with 15 mL of 0.1 M AgNO₃?

limiting reagent CaCl₂ AgNO₃

In chemistry, one question always comes up when two substances react. Which one will run out first? This is what we call the limiting reagent. It’s the one that determines how far a chemical reaction can go and how much


  • copychemistryadmin
  • June 21, 2025
  • Stoichiometry

Stoichiometry 22: How many moles of calcium chloride remain as excess after reacting 1.5 g of CaCl₂ with 15 mL of 0.1 M AgNO₃?

excess moles of CaCl₂

In every chemical reaction, some substances get used up completely while others are left behind. This leftover material is what we call the excess reagent. In this lesson, we’re not just identifying the limiting reagent — we’re calculating exactly how


  • copychemistryadmin
  • June 21, 2025
  • Stoichiometry

Stoichiometry 23: How many moles of AgCl are produced when 1.5 g of CaCl₂ reacts with 15 mL of 0.1 M AgNO₃?

Want to know how much product a reaction will make? This is where stoichiometry truly shines. When two substances react, the product depends on how much of each is available — and most importantly, how they combine according to a


  • copychemistryadmin
  • June 21, 2025
  • Stoichiometry

Stoichiometry 25: Calculate the mass of anhydrous Na₂CO₃ in 500 mL of 0.1 M solution

mass of Na2CO3 in solution

Introduction To begin with, if you’re preparing a sodium carbonate solution for a chemistry experiment. You need to prepare 500 mL of a 0.1 M Na₂CO₃ solution. Here’s the big question: How many grams of anhydrous sodium carbonate (Na₂CO₃) do


  • copychemistryadmin
  • June 19, 2025
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