The flame in a torch used to cut metal is produced by burning acetylene (C2H2)(26.04 g/mol) in pure oxygen. Assuming the combustion of 1 mole of acetylene releases 1251 kJ of heat, what mass of acetylene is needed to cut through a piece of steel if the process requires 22.5  × 104 kJ of heat?                                            2 C2H2(g) + 5 O2(g) → 4 CO2(g) + 2 H2O(g) ΔH = –2502 kJ

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Asked Nov 21, 2019
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The flame in a torch used to cut metal is produced by burning acetylene (C2H2)(26.04 g/mol) in pure oxygen. Assuming the combustion of 1 mole of acetylene releases 1251 kJ of heat, what mass of acetylene is needed to cut through a piece of steel if the process requires 22.5  × 104 kJ of heat?                                            2 C2H2(g) + 5 O2(g) → 4 CO2(g) + 2 H2O(g) ΔH = –2502 kJ

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Expert Answer

Step 1

Given that,

One mole of acetylene release heat = 1251 KJ

Molar mass of acetylene = 26.04g/mole

The reaction is

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2C,H2+5024co,+2H20

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Step 2

Now, you calculate the no.of moles of acetylene for 22.5×104 KJ heat using

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moles of C,H2 No.of moles of C,H-22.5x10 KJ of C,Hx 1251KJ of C2H2 -179.86 mole

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Step 3

Now, you calculate the m...

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Mass of C,Hmoles of C,H,xMolar mass of CH -179.86 molex26.04 mole 4683.55g -4.683x10'g

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