Question

name ______________ sept 5 warm up
use factor - label (dimensional analysis) method to solve the following problems. show your work.

1. a student has a 1 g sample of each of the following compounds: mgcl₂, baf₂, bacl₂. arrange these compounds in order of increasing number of moles.

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Explanation:

Step1: Calculate molar - mass of MgCl₂

$M_{MgCl_2}=24.31 + 2\times35.45=95.21\ g/mol$

Step2: Calculate moles of MgCl₂

$n_{MgCl_2}=\frac{1\ g}{95.21\ g/mol}\approx0.0105\ mol$

Step3: Calculate molar - mass of BaF₂

$M_{BaF_2}=137.33+2\times19.00 = 175.33\ g/mol$

Step4: Calculate moles of BaF₂

$n_{BaF_2}=\frac{1\ g}{175.33\ g/mol}\approx0.0057\ mol$

Step5: Calculate molar - mass of BaCl₂

$M_{BaCl_2}=137.33 + 2\times35.45=208.23\ g/mol$

Step6: Calculate moles of BaCl₂

$n_{BaCl_2}=\frac{1\ g}{208.23\ g/mol}\approx0.0048\ mol$

Answer:

$BaCl_2