Calculate mass (in grams) of sodium in 8.5 g of each sodium containing food additive. a. NaCl (table salt) b. Na 3 PO 4 (sodium phosphate) c. NaC 7 H 5 O 2 (sodium benzoate) d. Na 2 C 6 H 6 O 7 (sodium hydrogen citrate)

Hey everyone welcome back. So let's get started with this video here. They want us to calculate the mass of nitrogen g and a 15.5 g sample of the nitrogen Penta oxide. Okay. So then Dina Tre Champion tox side that is going to be die. That means to nitrogen Penta oxide. That means five oxygen's okay. And then we saw for the molar mass And we get that the molar mass of nitrogen Penta oxide is 108 point 01 grams per mole. Okay. And we're starting with the given of grams. So from grams we're going to want to go to moles and how do we go to most? That is by using molar mass, which we said was 108 point 01 g per mole. Okay. But we don't want molds. We want the mass of nitrogen and grams in this sample. Therefore, we're going to go to moles of nitrogen. Once again, we want the mess. So finally we're going to go two g of nitrogen because that is the mass of nitrogen. So how do we go from Mosul nitrogen grams of nitrogen? We're going to use the molar mass of nitrogen. Just nitrogen. And we can find that on the periodic table which is point 007 g per mole. So let's go ahead and start with our store Akiyama tree. And we're going to start with the given, Which is 15.5 grams of sample of di nitrogen Penta oxide. So N 205. Okay. So from gramps you're going to go to most by using the molar mass. So then there is 108 .01g of end to 05. And one more of N 205. Okay, So then now we're going to go to most of nitrogen. So then one more of N contains two moles of nitrogen. Okay? So then now we're going to go from moles of nitrogen, two g of nitrogen. So then one more of nitrogen. And we're going to use a molar mass of just nitrogen, which is .007g of nitrogen For one mole of nitrogen. So then grams of N 205, cancel out moles of N 205, cancel out most of end cancel out. And we just get grams of end the mass of nitrogen. We suffer it and we get four 0. grams nitrogen. Okay, Thank you for watching. I hope this helped. And I'll see you in the next video.

Ch.3 - Molecules and Compounds

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Tro 6th Edition

Ch.3 - Molecules and Compounds

Problem 91a

Chapter 3, Problem 91a

Calculate mass (in grams) of sodium in 8.5 g of each sodium containing food additive. a. NaCl (table salt) b. Na₃PO₄ (sodium phosphate) c. NaC₇H₅O₂ (sodium benzoate) d. Na₂C₆H₆O₇ (sodium hydrogen citrate)

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Step 1: Determine the molar mass of NaCl.

Step 2: Calculate the mass percentage of sodium (Na) in NaCl using the formula: \( \text{Mass percentage of Na} = \left( \frac{\text{Molar mass of Na}}{\text{Molar mass of NaCl}} \right) \times 100 \% \).

Step 3: Use the mass percentage of sodium to find the mass of sodium in 8.5 g of NaCl.

Step 4: Apply the formula: \( \text{Mass of Na} = \left( \frac{\text{Mass percentage of Na}}{100} \right) \times \text{Mass of NaCl} \).

Step 5: Calculate the mass of sodium in 8.5 g of NaCl using the values obtained in the previous steps.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Molar Mass

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). For sodium chloride (NaCl), the molar mass is calculated by adding the atomic masses of sodium (Na) and chlorine (Cl), which are approximately 23 g/mol and 35.5 g/mol, respectively. This concept is essential for converting between grams and moles in stoichiometric calculations.

Stoichiometry

Stoichiometry is the area of chemistry that deals with the relationships between the quantities of reactants and products in chemical reactions. It allows us to calculate the amount of a substance in a mixture based on its proportion to other components. In this case, stoichiometry helps determine the mass of sodium in a given mass of NaCl by using the ratio of sodium's molar mass to the total molar mass of NaCl.

Mass Percentage

Mass percentage is a way of expressing the concentration of an element in a compound, calculated as the mass of the element divided by the total mass of the compound, multiplied by 100. For NaCl, the mass percentage of sodium can be found by dividing the molar mass of sodium by the molar mass of NaCl and then multiplying by 100. This concept is crucial for determining how much sodium is present in a specific mass of the additive.