During the 4th of July holiday, you may see children (or adults) throwing small,

Question

During the 4th of July holiday, you may see children (or adults) throwing small, teardrop-shaped firecrackers that snap on striking a hard These firecrackers contain silver fulminate, a contact explosive, and potassium chlorate, which increases the explosiveness of the firecracker decomposes under 2 KCIO, (s-2 KCI (s) 3 oz (g) How many moles of O2 can be produced by reaction of 12.00 moles of KCIO,? Given the following equation: 2 K (s) Cl2 (g) 2 KCl (s) How many grams of KCI are produced from 2.50 g of K and excess Cl? Given the following equation: Na,o (s) H20 +2 NaoH (aq How many grams of NaoH is produced from 1.20 x 102 grams of Na20?

Explanation / Answer

1)

2 KClO3 (s)   —> 2 KCl (s) + 3 O2(g)

from the reaction above,

mol of O2 formed = (3/2)*mol of KClO3 reacting

= (3/2)*12.00 moles

= 18.00 moles

Answer: 18.00 moles

2)

mass of K = 2.5 g

molar mass of K = 39.1 g/mol

mol of K = (mass)/(molar mass)

= 2.5/39.1

= 0.0639 mol

Balanced chemical equation is:

2K + 1Cl2 ---> 2KCl

According to balanced equation

mol of KCl formed = (2/2)* moles of K

= (2/2)*0.0639

= 0.0639 mol

masss of KCl = number of mol * molar mass

= 0.0639*74.5

= 4.76 g

Answer: 4.76 g

3)

mass of Na2O = 120 g

molar mass of Na2O = 62 g/mol

mol of Na2O = (mass)/(molar mass)

= 120/62

= 1.94 mol

Balanced chemical equation is:

1Na2O + 1H2O ---> 2NaOH

According to balanced equation

mol of NaOH formed = (2/1)* moles of Na2O

= (2/1)*1.94

= 3.87 mol

masss of NaOH = number of mol * molar mass

= 3.87*40

= 155 g

Answer: 155 g

4)

mass of NaOH = 120 g

molar mass of NaOH = 40 g/mol

mol of Na2O = (mass)/(molar mass)

= 120/40

= 3.00 mol

Balanced chemical equation is:

1Na2O + 1H2O ---> 2NaOH

According to balanced equation

mol of Na2O formed = (1/2)* moles of Na2O

= (1/2)*3.00

= 1.50 mol

masss of Na2O = number of mol * molar mass

= 1.50 mol *62 g/mol

= 93.0 g

Answer: 93.0 g

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