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What mass of natural gas ( C H 4 ) must burn to emit 2 7 5 k J of heat? C H 4 (

What mass of natural gas

(C H_{4})

must burn to emit

275 k J

of heat?

C H_{4} (g) + 2 O_{2} (g) C O_{2} (g) + 2 H_{2} O (g)

_{r} H = - 802.3 k J m o l^{- 1}

m =

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