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irinina [24]
3 years ago
7

How many moles of HCL are in 18 grams? (Use the molar mass to convert miles to grams. Round you answer to 2 decimal places.)

Chemistry
2 answers:
Kipish [7]3 years ago
7 0

Answer:

0.49 mol HCl

General Formulas and Concepts:

<u>Chemistry - Atomic Structure</u>

  • Reading a Periodic Table
  • Using Dimensional Analysis

Explanation:

<u>Step 1: Define</u>

18 g HCl

<u>Step 2: Identify Conversions</u>

Molar Mass of H - 1.01 g/mol

Molar Mass of Cl - 35.45 g/mol

Molar mass of HCl - 1.01 + 35.45 = 36.46 g/mol

<u>Step 3: Convert</u>

<u />18 \ g \ HCl(\frac{1 \ mol \ HCl}{36.46 \ g \ HCl} ) = 0.493692 mol HCl

<u>Step 4: Check</u>

<em>Round our answer to 2 decimal places.</em>

0.493692 mol HCl ≈ 0.49 mol HCl

tresset_1 [31]3 years ago
6 0

Answer:

0.49 mol

Explanation:

<h3> mol=given mass /molecular mass </h3><h2>: = 18/36.5 </h2><h3> =0.49</h3>

<h3 />

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A compound with a molar mass of 60g/mol is 40.4% carbon, 6.7% hydrogen and 53.3% oxygen (by mass). determine the emperical and m
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<span>A compound is found to be 40.0% carbon, 6.7% hydrogen and 53.5% oxygen. Its molecular mass is 60. g/mol. 
</span>Q1)
Empirical formula is the simplest ratio of whole numbers of components making up a compound.
the percentages have been given, therefore we can calculate for 100 g of the compound.

                                C                            H                        O
Mass in 100 g      40.0 g                       6.7 g                   53.5 g
Molar mass            12 g/mol                1 g/mol                 16 g/mol
Number of moles   40.0/12= 3.33         6.7/1 = 6.7          53.5/16 = 3.34
Divide by the least number of moles  
                             3.33/3.33 = 1           6.7/3.33 = 2.01   3.34/3.33 = 1.00
after rounding off
C - 1 
H - 2
O - 1

Empirical formula - CH₂O

Q2)
Molecular formula is the actual number of components making up the compound.
To find the number of empirical units we have to find the mass of one empirical unit.
Mass of one empirical unit = CH₂O - 12 + (1x2) + 16 = 30 g
Mass of one mole of compound = 60 g
Number of empirical units = 60 g / 30 g = 2
Therefore molecular formula - 2(CH₂O) 
 Molecular formula - C₂H₄O₂
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3 years ago
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