26. Classify each chemical equation as a combination/synthesis , decomposition, single replacement, double replacement, or combu
stion.
a. Pb(s) + Hg2SO4(s) PbSO4(s) +2 Hg(l)
b. NaCl(aq) + AgNO3(aq) AgCl(s) + NaNO3(aq)
c. 2 H20(l)2 H2(g) + 02(g)
27. Find the molar mass of nitric acid (HNO3).
28. Avogadro’s number refers to ___.
a. the maximum number of electrons that all of an atom’s energy levels can accommodate
b. the number of protons and neutrons that can fit in the shells of an atom’s nucleus
c. the number of particles in one mole of a substance
d. the number of particles in exactly 1.0 g of a substance
29. How many moles of oxygen atoms are in 1.5 moles of CO2? (Sc2c)
a. 1 mol b. 1.5 mol c. 2 mol d. 3 mol
30. What is the mass of 0.28 mol of iron ?
a. Pb(s) + Hg2SO4(s) PbSO4(s) +2 Hg(l)
b. NaCl(aq) + AgNO3(aq) AgCl(s) + NaNO3(aq)
c. 2 H20(l)2 H2(g) + 02(g)
27. Find the molar mass of nitric acid (HNO3).
28. Avogadro’s number refers to ___.
a. the maximum number of electrons that all of an atom’s energy levels can accommodate
b. the number of protons and neutrons that can fit in the shells of an atom’s nucleus
c. the number of particles in one mole of a substance
d. the number of particles in exactly 1.0 g of a substance
29. How many moles of oxygen atoms are in 1.5 moles of CO2? (Sc2c)
a. 1 mol b. 1.5 mol c. 2 mol d. 3 mol
30. What is the mass of 0.28 mol of iron ?
1 answer:
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The pH of the solution is 3,76
Why?
To solve this problem we have to apply the Henderson-Hasselbach equation, which is used whenever we need to calculate the pH of a solution of an acid HA (Lactic Acid) and its conjugate base A⁻ (Sodium Lactate)
We can use either moles or concentrations for this equation. In this case, we are going to use the moles, and we are going to take the pKa of lactic acid as 3,86:
Have a nice day!
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