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CHEM1161 Lecture Notes - Allyl Group, Chemical Equation, Molar Mass

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bluecoyote900
31 Jan 2014
School
Boston College
Department
Chemistry
Course
CHEM1161
Professor
Schlegel

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Document Summary

Avogadro"s number: small particles such as atoms, molecules, and ions are counted using the mole. 1 mole of an element = 6. 02 x 1023 atoms of that element. 1 mole of water = 6. 02 x 1023 molecules h20. 1 mole of sodium = 6. 02 x 1023 atoms of sodium. Avogadro"s number, 6. 02 x 1023, can be written as an equality and as two conversion factors. The subscripts in a formula show: the relationship of atoms in the formula, the moles of each element in 1 mole of compound. 1 molecule: 9 atoms of c 8 atoms of h 4 atoms of o. 1 mole: 9 moles of c 8 moles of h 4 moles of o. The molar mass: is the mass of 1 mole of an element, is the atomic mass expressed in grams. Ex: allyl sulfide, c6h10s, is a compound that has the odor of garlic.

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Related Questions

The mole is defined as the number of atoms in exactly 12 g of carbon-12. The mole equals 6.022×1023 items of whatever you are counting. This number is also called Avogadro's number, after Amadeo Avogadro (1776–1856). Molar mass is the mass of 1 mol of atoms of an element; for compounds, molar mass is the mass of 1 mol of molecules or formula units. Molar mass can be used to convert mass to moles for any element or compound.

How many grams are in 4.60 mol of sodium chloride (NaCl)?

How many water molecules are in a block of ice containing 2.25 mol of water (H2O)?

3. Write the product formed in the following reactions in the space provided. If the reaction does not take place write NO RXN. Indicate physical states by (s), (l), (g), (aq). Make sure the reaction is balanced! Please write the net ionic equation below.

a. Pb(CH3CO2)2(aq) + Na2SO4(aq) Ã

b. AgNO3(aq) + NH4Br(aq) Ã

4. Balance the following reactions and answer the questions below.

a. Al(s) + HCl (aq) Ã AlCl3 + H2

What is the element that is oxidized _______________________

What is the element that is reduced _______________________

Which compound is the oxidizing agent ____________________

Which compound is the reducing agent ____________________

b. Na(s) + FeCl2 Ã NaCl + Fe

What is the element that is oxidized _______________________

What is the element that is reduced _______________________

Which compound is the oxidizing agent ____________________

Which compound is the reducing agent ____________________

8. Using the unbalanced equation how many grams of lithium nitrate will be needed to make 250g of lithium sulfate, assuming that you have an adequate amount of lead (IV) sulfate to do the reaction.

Pb(SO4)2(aq) + LiNO3(aq) Ã Pb(NO3)4(s) + Li2SO4(aq)

9. Using the following equation determine how many grams of sodium fluoride can react with 184.4 grams of magnesium.

Mg + NaF2 Ã MgF2 + Na

10. Determine how many Oxygen atoms are present in 46.7g of Zr(SO4)2

10. Given the following unbalanced equation:

Al2O3(aq) + Fe(s) Ã Fe2O3(aq) + Al(s)

Determine how many grams of Iron (III) Oxide can be formed if 224 grams of aluminum oxide is reacted with iron.

Multiple choice:

10b. Which of the following statement is true about 1 mole of Ca(NO3)2?

a. It contains the 6.02 x 1023 NO3- ions.

b. It weighs 146 grams

c. It will most likely dissolve in a bucket of water.

d. It will produce equal number of Ca+2 and NO3- ion in a solution.

10. How many molecules are present in 48.0 grams of oxygen gas? (O2)

a. 6.02 x1023 b. 1.81 x1024 c. 9.03 x1023 d. 1.03x1024

12. If there are 12 moles of carbon in 1 mole of sucrose, C12H22O11.How many atoms of carbon are there in 1 mole of sucrose?

a. 1 x6.03 x 1023 b. 12x 6.03 x 1023 c. 22 x 6.03 x 1023

13. Determine the oxidation state of oxygen in the compound Cr2O3 in the following equation:

Cr2O3(s) + 2Al(s) Ã Cr(s) + Al2O3(s)

-2 b. -6 c. 6 d. 2

16. Determine the oxidation state of Al in the following equation:

Al(s) + HCl à AlCl3(aq) + H2

+2 b. 0 c. +3 d. -5

3 questions