Hey guys can someone help me with calculating masses of reactants and products ..... And also calculating limiting and excess reagents , I can't remember all the steps so I wanna know is there an easy way to remember it, I allways get confused and unit test is coming soon so I want to study .... Thanks to everyone who help me out

This is too open ended. If you will narrow the question, do one subject at a time, and post a specific question, I think you will get more nibbles.

Of course, I'd be happy to help you with calculating masses of reactants and products, as well as determining limiting and excess reagents. To make it easy to remember, we can break the process down into steps. Here's a simplified guide:

Step 1: Write the balanced chemical equation.
Before you can calculate the masses of reactants and products, you need the balanced chemical equation. It tells you the ratio in which the reactants combine and the products are formed.

Step 2: Convert known quantities to moles.
Determine the given quantity in moles for each reactant and product. You can use the given mass and the molar mass of the substance to convert between grams and moles.

Step 3: Determine the limiting reagent.
Compare the mole ratios of the reactants from the balanced equation with the given quantities in moles. The reactant that is completely consumed, resulting in the least amount of product, is the limiting reagent.

Step 4: Calculate the moles of product(s) formed.
Using the mole ratios from the balanced equation, determine the moles of product that can be formed based on the limiting reagent.

Step 5: Convert moles to masses.
Based on the moles of product(s) calculated in step 4, use the molar mass of the product(s) to convert the moles to grams.

To make it even easier to understand, let's consider an example:
Suppose we have the balanced equation:
2H2 + O2 --> 2H2O

Given that we have 4.0 grams of H2 and 32.0 grams of O2, we can follow these steps:

Step 1: Write the balanced chemical equation: 2H2 + O2 --> 2H2O

Step 2: Convert grams to moles:
4.0 grams H2 * (1 mole H2 / molar mass of H2) = x moles H2
32.0 grams O2 * (1 mole O2 / molar mass of O2) = y moles O2

Step 3: Determine the limiting reagent:
To determine the limiting reagent, compare the mole ratios of H2 and O2 based on the balanced equation with the given quantities in moles (x and y). The reactant that produces the least amount of product is the limiting reagent.

Step 4: Calculate the moles of product formed:
Based on the limiting reagent determined in step 3, use the mole ratios from the balanced equation to calculate the moles of product(s) formed.

Step 5: Convert moles to masses:
Using the molar mass of the product(s) calculated in step 4, convert the moles to grams.

Remember to double-check your calculations and units to ensure accuracy.

By following these steps and practicing with different examples, you'll become more familiar with the process and find it easier to remember. Good luck with your studies and your upcoming unit test!