Your unknown value is mass (m):
Q = 5681 J
m = ?
c = 4.814 J / kg Celsius
T = T2 - T1 = 47.1 - 21.7 = 25.4 Celsius
Q = mcT
m = Q / cT
m = (5681) / (4.814 x 25.4)
m = 46.46061847 g
m = 46.5 g (according to the number of significant figures you gave us!)
uhhhh?
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Verified answer
Your unknown value is mass (m):
Q = 5681 J
m = ?
c = 4.814 J / kg Celsius
T = T2 - T1 = 47.1 - 21.7 = 25.4 Celsius
Q = mcT
m = Q / cT
m = (5681) / (4.814 x 25.4)
m = 46.46061847 g
m = 46.5 g (according to the number of significant figures you gave us!)
uhhhh?