Question

1) The equation for the trendline follows the formula y = mx + b, where b is the y-intercept. The y-intercept should be zero. Briefly explain why.

2) If the water temperature was 30.0C and the atmospheric pressure was 753 torr. What volume of hydrogen gas would you expect to collect if you reacted 0.083g of Ca metal with HCl?

Answer 1

Ca + 2HCl ------> CaCl2 + H2

1 mole of Ca produces 1 mole of dihydrogen

40 g of Ca produces 2 g of Dihydrogen

0.083g of Ca produces (2/40) * 0.083 g of dihydrogen

                                         = 0.00415 g of H2

PV = nRT

V = ((0.00415 / 2) * 0.0821 * 303) / (753/760)

V = 0.0521 L of H2 produced