The correct answer is 3.Silver
100.0g x 4.184J/g/°C x 78°C ΔT = 32,645.2 Joules.
Moles of Na2SO4 = conc. x volume(dm3)
= 2 x (2500cm3/1000)
= 5 mol
Mass of Na2SO4 = moles x molar mass
= 5 x ((23 x 2) + 32.1 + (16 x 4))
= 710.5g
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The amount of grams the student gained is 997.9 grams
<h3>Data obtained from the question</h3>
From the question given above, the following data were obtained:
- Mass (in lb) = 2.2 lb
- Mass (in grams) =?
<h3>How to convert 2.2 lb to grams</h3>
The mass gained in grams can be obtained by simply converting 2.2 lb to grams. This is illustrated below:
1 lb = 453.592 grams
Therefore,
2.2 lb = (2.2 lb × 453.592 grams) / 1 lb
2.2 lb = 997.9 grams
Thus, the number of grams the student gained is 997.9 grams
Learn more about conversion:
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