Question 15 please! I don’t understand part b of the question a) What is the chemical name of this compound?b) How many moles were in the sample provided?c) How many molecules were in the sample provided?14. In 1894 Lord Rayleigh removed oxygen, nitrogen, carbon dioxide, and water vapour from asample of air. A small quantity of gas remained. Assume this gas was a pure sample of amonatomic element. 1.00 L of this gas had a mass of 1.63 g at 298 K and 101.3 kPa pressure.a) Calculate the atomic mass of the element discovered by Rayleigh.b) Name the element.Ac) This element has a higher atomic mass than the element following it in the periodictable. Suggest the reason for this.15. Two aqueous solutions of acids HA and HB are prepared. Each solution has a concentrationof 0.010 M. The pH of the solution of HA is 2.0, whilst the pH of the solution of HB is 4.2.a) Explain why the pH of these solutions differ.b) What volume of an aqueous solution of 0.0025 M sodium hydroxide is needed toneutralize exactly 10.9 mNAOHof the solution of HA?16. The table below gives the melting points of the chlorides of seven consecutive elements A toG in a period of the Periodic Table.ElementADFMP of chloride (°C)801712193-68-91-80-101,413 1,3136 319.4 -96. Aa) Give one element, A to G, which could be a metal.-112 -149- 131.8

Answered: Image /qna-images/answer/aa38edcf-9c12-4387-84a9-6b2ec2dd9fb3.jpg

Answered: b) What volume of an aqueous solution…

b) What volume of an aqueous solution of 0.0025 M sodium hydroxide is needed to neutralize exactly 10.0 mL of the solution of HA?

Chemistry: An Atoms First Approach

2nd Edition

ISBN:9781305079243

Author:Steven S. Zumdahl, Susan A. Zumdahl

Publisher:Steven S. Zumdahl, Susan A. Zumdahl

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 69CP: You have two distinct gaseous compounds made from element X and element Y. The mass percents are as...

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Question

Question 15 please! I don’t understand part b of the question

a) What is the chemical name of this compound?
b) How many moles were in the sample provided?
c) How many molecules were in the sample provided?
14. In 1894 Lord Rayleigh removed oxygen, nitrogen, carbon dioxide, and water vapour from a
sample of air. A small quantity of gas remained. Assume this gas was a pure sample of a
monatomic element. 1.00 L of this gas had a mass of 1.63 g at 298 K and 101.3 kPa pressure.
a) Calculate the atomic mass of the element discovered by Rayleigh.
b) Name the element.
Ac) This element has a higher atomic mass than the element following it in the periodic
table. Suggest the reason for this.
15. Two aqueous solutions of acids HA and HB are prepared. Each solution has a concentration
of 0.010 M. The pH of the solution of HA is 2.0, whilst the pH of the solution of HB is 4.2.
a) Explain why the pH of these solutions differ.
b) What volume of an aqueous solution of 0.0025 M sodium hydroxide is needed to
neutralize exactly 10.9 m
NAOH
of the solution of HA?
16. The table below gives the melting points of the chlorides of seven consecutive elements A to
G in a period of the Periodic Table.
Element
A
D
F
MP of chloride (°C)
801
712
193
-68
-91
-80
-101
,413 1,3136 319.4 -96. A
a) Give one element, A to G, which could be a metal.
-112 -149
- 131.8

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