1) <span> 2.7 g water + 6,6 g carbon dioxide </span>→<span> 9.3 g carbonic acid.
According to </span><span>principle of mass conservation mass of reactants and products are the same after chemical reactio. 2,7 g + 6,6 g = 9,3 g.
2) </span><span>32.0 g sodium hydroxide + 16.0 g hydrofluoric acid --> 14,4 g water + 33.6 g sodium fluoride.
m(water) = 32 g + 16 g - 33,6 g.
3) </span><span>0.60 g calcium carbonate + 0.48 g sodium hydroxide --> 0,63 g sodium carbonate + 0.45 g calcium.
m(sodium carbonate) = 0,6 g + 0,48 g - 0,45 g.
4) </span><span>0.53 g sodium hydroxide + 0.37 g carbon dioxide --> 0,9 g sodium hydrogen carbonate.
m(sodium hydrogen carbonate) = 0,53 g + 0,37 g = 0,9 g.</span>
<span>The molecular formula for Copper(II) Sulfate is CuSO4. 1 mole is equal to 1 moles Copper(II) Sulfate, or 159.6086 grams.I hope this is right </span>
The % error in the student’s data is
Correct score - run score/ correct score * 100
In run 1 we have
0.2542 - 0.2541/0.2542 * 100 = 0.000393391031 = 0.03933%
In run 2 we have
0.2542 - 0.2668/0.2542 * 100 = -0.00495672699 = -0.495%
In run 3 we have
0.2542 - 0.2549/0.2542 * 100 = -0.00275373721 = -0.275%
And run 4 we have
0.2542 - 0.2554/0.2542 * 100 = 0.00495672699 = 0.495
The spread are 0.2542 - 0.2541 = 0.0001 and 0.2542 - 0.2668 = -0.0126
Also 0.2542 - 0.2549 = -0.0007 and 0.2542 - 0.2554 = -0.0012