Answered: Question number one please | bartleby

Chemistry

9th Edition

ISBN:9781133611097

Author:Steven S. Zumdahl

Publisher:Steven S. Zumdahl

Chapter2: Atoms, Molecules, And Ions

Section: Chapter Questions

Problem 108CWP

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Question number one please

significande
to significant figures,
b) What is the mass of 3.64 x 10° atoms of magnesium?
6,02 x 102 3
2 The current dietary recommendation is to consume less than 0.10 mol of sodium per day.
This is about one teaspoon of table salt. It includes all salt and sodium consumed, including
sodium used in cooking and at the table.
The sodium content of a popular type of fast-food hamburger is 730 mg.
a) How many moles of sodium ions are present in one of these hamburgers?
b) How many of these hamburgers can you eat in a day to fulfil all of your sodium
dietary requirements?
led in oxygen to form 11.5 g of an oxide of nitrogen.
en!)

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The present average concentration (mass percent) of magnesium ions in seawater is 0.13%. A chemistry textbook estimates that if 1.00 × 108 tons Mg were taken out of the sea each year, it would take one million years for the Mg concentration to drop to 0.12%. Do sufficient calculations to either verify or refute this statement. Assume that Earth is a sphere with a diameter of 8000 mi, 67% of which is covered by oceans to a depth of 1 mi, and that no Mg is washed back into the oceans at any time.
3.55 An average person inhales roughly 2.5 g of O2 in a minute. How many molecules of oxygen are inhaled in (a) 1 minute, (b) 1 hour, (c) 1 day by an average person?
3.68 Magnesium is lighter than other structural metals, so it is increasingly important in the design of more efficient vehicles. Mg2+ ions are present in seawater, and the metal is often prepared by "harvesting" these ions and converting them to Mg metal. The average magnesium content of the oceans is about 1270 g Mg2+ per ton of seawater, and the density of seawater is about 1.03 g/mL. What is the molarity of Mg2+ ions in seawater? The design for a concept car calls for 103 kg of magnesium per vehicle. How many gallons of seawater would be required to supply enough magnesium to build one of these ears?
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