Dimensional analysis & conversions. If you need scientific notation in you answer, copy this for the exponential part: "x10^". An example would be 6.022x10^23 for Avogadro's number. Your answers need to have the correct number of significant figures. How many moles of aluminum are in 8.09x1022 aluminum atoms?

Dimensional analysis & conversions. If you need scientific notation in you answer, copy this for the exponential part: "x10^". An example would be 6.022x10^23 for Avogadro's number. Your answers need to have the correct number of significant figures. How many moles of aluminum are in 8.09x1022 aluminum atoms?

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter3: Molecules, Moles, And Chemical Equations

Section: Chapter Questions

Problem 3.83PAE: 3.83 For the reaction of nitrogen, N2, and hydrogen, H2, to form ammonia, NH3, a student is...

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3.83 For the reaction of nitrogen, N2, and hydrogen, H2, to form ammonia, NH3, a student is attempting to draw a particulate diagram, as shown below. Did the student draw a correct representation of the reaction? If not, what was the error the student made?
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.
3.37 If atypical grain of sand occupies a volume of 1.3 × 10-4 cm3, what is the volume (in cm3) of 1 mole of sand (ignoring the space between grains)? What is the volume in liters?
How many C atoms are present in the sample of C3H3 with mass 7.11 g? Avogadro's number is 6.022 x 1023. Enter your answer using scientific notation and to three significant digits. C atoms
Dimensional analysis & conversions. If you need scientific notation in you answer, copy this for the exponential part: "x10^". An example would be 6.022x10^23 for Avogadro's number. Your answers need to have the correct number of significant figures. 0.39 moles of titanium is equivalent to how many titanium atoms?
5. The density of water at 4.00°C is 0.967 g/mL. How many molecules of water are present in a 499.8 mL bottle of water? Express your answer to the correct number of significant figures. Be sure to show all steps completed to arrive at the answer. 1.615 X 105 molecules water, to solve the equation you can calculate the mass and the water and then convert It to moles and then you calculate the number of molecules
What is the numerical value of Avogadro's number? Report your answer to 4 significant figures. (Your answer should be entered as in the following example: 1000 = 1.0E+3.)
Convert (7.8x10^24) molecules of sodium chloride, NaCl (OR N a C l) to grams of sodium chloride. Avogadro's Number is (6.02x10^23). You must enter your answer in scientific notation. For example, 25 would be expressed as 2.5x10^1.
How many molecules of hydrogen fluoride (HF) are in (2.1x10^-2) moles of hydrogen fluoride (HF)? For Avogadro's number use: 6.022 x 1023 Round your answer to two significant figures. For the unit, use the word molecule. Note: Your answer is assumed to be reduced to the highest power possible.
Dimensional analysis & conversions. If you need scientific notation in you answer, copy this for the exponential part: "x10^". An example would be 6.022x10^23 for Avogadro's number. Your answers need to have the correct number of significant figures. How many moles of oxygen are in 55.2 grams of KNO3? (The molar mass of KNO3 is 101.1 g/mol.)
Calculate the total number of oxygen atoms in 65.0 g of KClO3. Express your answer in scientific notation rounded to three significant figures.
What is the mass of 2.41 moles of AgN*O_{3} ? Write your answer to 2 decimal places and include the unit.