a Secure https//session.masteringchemistry.com/myct/itemVi 88982799 ChartedHomew

Question

a Secure https//session.masteringchemistry.com/myct/itemVi 88982799 ChartedHomework ± Core Chemistry Skill Calculating the Quantity of a Reactant or Product for * previous 9 of 10 | nent ± Core Chemistry Skill Calculating the Quantity of a Reactant or Product for a Chemical Reaction in Solution Part A What volume of 2 00 MHCl in liters Express your answer to three significant figures and include the appropriate units. is needed to react completely (with nothing left over) with 0 750 L of 0.500 M Nag CO,? The stoichiometric relationship between the reactants and products of an aqueous reaction can be used to determine different kinds of information about a reaction, such as the volume of a given molarity reactant required to produce a certain amount of product Hints Value Units Submit My Answers Give Up Part B A 659-ml sample of unknown HCl solution reacts completely with NayC0s to form 17 1 ECO2 What was the concentration of the HCl solution? Express your answer to three significant figures and include the appropriate units Hints alue mits Submit My Answers Give Up 5:33 PM ^d) 11/14/2017

Explanation / Answer

A)

Lets write the reaction equation first:

Na2CO3 + 2HCl --------> 2NaCl +H2O + CO2

moles of Na2CO3 = molarity x volume in litres = 0.5M x 0.750 L = 0.375 mol

1 mol Na2CO3 needs 2 mol HCl

0.375 mol will need = 2/1 x 0.375 mol = 0.750 mol HCl

moles of HCl = molarity x volume = 2.0 x V = 0.750

V = 0.375 L HCl

B)

from the equation we see that moles of CO2 formed = moles of HCl reacted / 2

moles of CO2 = mass obtained / molar mass = 17.1g/44g/mol = 0.3886 mol

moles of HCl needed = 0.3886 x 2 = 0.777 mol HCl

moles = molarity x volume in litres = 0.659 L x M = 0.777 mol

M = 1.12 mol/L

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.