Anhydrous CaCl2 is used as a desiccant in desiccators, i.e. It removes water from the air within the desiccators and forms a hydrated salt. A 16.43g mass of anhydrous CaCl2 weighed 21.75g after being left in desiccators for several months. What is the formula of the hydrated CaCl2?

Question

05-10-2016
Chemistry

contestada

Anhydrous CaCl2 is used as a desiccant in desiccators, i.e. It removes water from the air within the desiccators and forms a hydrated salt. A 16.43g mass of anhydrous CaCl2 weighed 21.75g after being left in desiccators for several months. What is the formula of the hydrated CaCl2?

Respuesta :

Otras preguntas

04-A watershed is: a. the area drained by a sewer system b. the area contributing water to the runoff of a stream system c. the area covered by the groundwater

You are treating a 50-year-old woman who has just finished a 10k run. She is complaining of crushing pain in the chest radiating down her left arm and nausea, w

Hector has an insatiable thirst and frequent urination; he becomes dehydrated quickly. Blood glucose and insulin are normal. What could be the problem?

Without expanding determinants,Prove that

Solve: 16x^2 − 80 = 0 using the quadratic formula Round the answer to the nearest hundredth. x = −0.45 and x = 0.45 x = −2.24 and x = 2.24 x = −8.94 and x = 8

Because there are 64 possible codons and only 20 amino acids: a. many mutations have no effect on phenotype. b. every mutation has some effect on phenotype. c

should boys and girls should be in same classes

What is the history of daylight savings time?

Are the two triangles below similar? Triangles STU and VWX are shown. Angle S equals 28 degrees, Angle T equals 70 degrees, Angle W equals 70 degrees, Angle X

Edufirst Edufirst · Answer 1 · 2016-10-12T11:47:59+02:00

You need to calculate the number of moles of CaCl2 and the number of moles of water

Number of moles of Ca Cl2 = mass of Ca Cl2 / molecular mass of Ca Cl2

mass of Ca Cl2 = 16.43 g

molecular moss of Ca Cl2 = 40 g / mol + 2 * 35.5 g/mol = 40 g/mol + 71 g/mol = 111 g/mol

Number of moles of Ca Cl2 = 16.43 g / 111 g/mol = 0.148 moles

Number of moles of water = mass of water / molecular mass of water

mass of water = mass of compound after being left in desiccators - initial mass of Ca Cl2

mass of water = 21.75 g - 16.43 g = 5.32 g

number of moles of water = 5.32 g / 18 g/ mol = 0.296 moles

Ratio water to Ca Cl2 (in moles) = 0.296 / 0.148 = 2

The there are two moles of water per mol of Ca Cl2 and the formula for the hydrated Ca Cl2 is:

[tex]CaCl_2.2H_2O[/tex]