To calculate cost of one apple when the bag of 1.00-kg containing 8 apples costs $ 1.48 and mass of apple that costs $ 1.00. Concept introduction: Significant figures are required when performing math operations Use sig. fig rules for multiplication Calculations between SI systems are always exact values. Given: a p p l e s = 8 m = 1.00 k g Pr i c e = $ 1.48 p e r k g

Question

Experiment: Each team will be provided with 5g of a mixture of acetanilide and salicylic acid. You will divide it into three 1.5 g portions in separate 125 mL Erlenmeyer flasks savıng some for melting point analysis. Dissolve the mixture in each flask in ~60mL of DI water by heating to boiling on a hotplate. Take the flasks off the hotplate once you have a clear solution and let them stand on the bench top for 5 mins and then allow them to cool as described below. Sample A-Let the first sample cool slowly to room temperature by letting it stand on your lab bench, with occasional stirring to promote crystallization. Sample B-Cool the second sample 1n a tap-water bath to 10-15 °C Sample C-Cool the third sample in an ice-bath to 0-2 °C Results: weight after recrystalization and melting point temp. A=0.624g,102-115° B=0.765g, 80-105° C=1.135g, 77-108 What is the percent yield of A,B, and C.

Answer 1

Question

Chapter 1, Problem 1.50PAE

Interpretation Introduction

Interpretation:

To calculate cost of one apple when the bag of 1.00-kg containing 8 apples costs $ 1.48 and mass of apple that costs $ 1.00.

Concept introduction:

Significant figures are required when performing math operations

Use sig. fig rules for multiplication

Calculations between SI systems are always exact values.

Given:

apples=8m=1.00 kgPrice=$1.48 per kg

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Experiment: Each team will be provided with 5g of a mixture of acetanilide and salicylic acid. You will divide it into three 1.5 g portions in separate 125 mL Erlenmeyer flasks savıng some for melting point analysis. Dissolve the mixture in each flask in ~60mL of DI water by heating to boiling on a hotplate. Take the flasks off the hotplate once you have a clear solution and let them stand on the bench top for 5 mins and then allow them to cool as described below. Sample A-Let the first sample cool slowly to room temperature by letting it stand on your lab bench, with occasional stirring to promote crystallization. Sample B-Cool the second sample 1n a tap-water bath to 10-15 °C Sample C-Cool the third sample in an ice-bath to 0-2 °C Results: weight after recrystalization and melting point temp. A=0.624g,102-115° B=0.765g, 80-105° C=1.135g, 77-108 What is the percent yield of A,B, and C.

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