FOUNDATIONS OF COLLEGE CHEM +KNEWTONALTA
FOUNDATIONS OF COLLEGE CHEM +KNEWTONALTA
15th Edition
ISBN: 9781119797807
Author: Hein
Publisher: WILEY
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Chapter 9, Problem 1PE

(a)

Interpretation Introduction

Interpretation:

The number of moles in 25gKNO3 has to be given.

(b)

Interpretation Introduction

Interpretation:

The number of moles in 56milimolNaOH has to be given.

(c)

Interpretation Introduction

Interpretation:

The number of moles in 5.4×102g(NH4)2C2O4 has to be given.

(d)

Interpretation Introduction

Interpretation:

The number of moles in 16.8mLH2SO4 has to be given.

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12. (b) A student knew that calcium hydroxide could be made by adding calcium to water. The student added 0.00131 mol of calcium to a beaker containing about 100 cm of water. A reaction took place as shown by the equation below, All the calcium hydroxide formed was soluble. Ca(s) + 2H,0(1I) → Ca(OH) (aq) + H,(g) (D Calculate the mass of calcium that the student added. mass of calcium = g (ii) Calculate the volume of hydrogen gas, in dm3, produced in this reaction at room temperature and pressure, RTP. volume of hydrogen gas = dm3 (iii) The student transferred the contents of the beaker to a 250 cm3 volumetric flask and water was added to make the solution up to 250 cm³. Calculate the concentration, in mol dm3, of hydroxide ions in the 250 cm³ solution. concentration = moldm 3
. A sample of 1.000 g of a compound containing carbon and hydrogen reacts with oxygen at elevated temperature to yield 0.692 g H2O and 3.381 g CO2.(a) Calculate the masses of C and H in the sample.(b) Does the compound contain any other elements?(c) What are the mass percentages of C and H in thecompound?(d) What is the empirical formula of the compound?
A compound is composed of carbon, hydrogen, nitrogen and oxygen. When a 1.500-g sample of the compound is completely combusted, it yields 1.476 g of CO2and 0.605 g of H2O. In a separate analysis to determine nitrogen, 1.500 g of the compound is found to produce 0.313 g of N2. (a) Calculate the mass percent of each element in the compound. (b) Determine the empirical formula of the compound. (c) If the compound has a molar mass of 134 g/mol, what is the molecular formula?
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