1) How many grams of CO are needed to react with an excess of Fe2O3 to produce 225.5 gFe? Numbers after symbols are subscripts unless there is a ^ to show it is an exponent ... Fe2O3 (s) + 3CO (g) - - > 3 CO2 (g) + 2 Fe (s) ...

2) Solid sodium reacts violently with water producing heat, hydrogen gas and sodium hydroxide. How many molecules of hydrogen gas are produced when 65.4 g of sodium are added to water? Numbers after symbols are subscripts unless there is a ^ to show it is an exponent ... 2 Na (s) + 2 H2O (l) - - > 2 NaOH (aq) + H2 (g) ...

Question

Chemistry

Brandi

8 December, 15:13

1) How many grams of CO are needed to react with an excess of Fe2O3 to produce 225.5 gFe? Numbers after symbols are subscripts unless there is a ^ to show it is an exponent ... Fe2O3 (s) + 3CO (g) - - > 3 CO2 (g) + 2 Fe (s) ...

2) Solid sodium reacts violently with water producing heat, hydrogen gas and sodium hydroxide. How many molecules of hydrogen gas are produced when 65.4 g of sodium are added to water? Numbers after symbols are subscripts unless there is a ^ to show it is an exponent ... 2 Na (s) + 2 H2O (l) - - > 2 NaOH (aq) + H2 (g) ...

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Answers (1)

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Joey Hayden · Answer 1

1)

Moles = mass / Mr

Mr of Fe = 56

Moles of Fe = 225.5 / 56

Moles of Fe = 4.03

Molar ratio CO : Fe = 3 : 2

Moles of CO = 4.03 x 3/2

Moles of CO = 6.04 moles

Mass of CO = 6.04 x (12 + 16)

Mass of CO = 169.1 grams

2)

Moles of Na = 65.4 / 23

Moles of Na = 2.84

Molar ratio Na : H₂ = 2 : 1

Moles of H₂ = 1.42

Each mole has 6.02 x 10²³ particles

Molecules of Hydrogen = 1.42 x 6.02 x 10²³

Molecules of Hydrogen = 8.55 x 10²³ particles