What is the molecular mass of each substance? Use periodic table for atomic masses: 1. carbon tetrachloride 2. silicon dioxide 3. trisilicon tetranitride 4. disulfur difluoride 5.... What is the molecular mass of each substance? Use periodic table for atomic masses: 1. carbon tetrachloride 2. silicon dioxide 3. trisilicon tetranitride 4. disulfur difluoride 5. iodine pentabromide 6. nitrogen trichloride 7. diphosphorus pentoxide
Understand the Problem
The question is asking for the molecular mass of several chemical substances. This involves determining the atomic masses of the constituent elements from the periodic table and summing them based on the number of each type of atom present in the compounds listed.
Answer
1. CCl₄: 153.81 g/mol 2. SiO₂: 60.09 g/mol 3. Si₃N₄: 140.31 g/mol 4. S₂F₂: 102.14 g/mol 5. IBr₅: 526.40 g/mol 6. NCl₃: 120.36 g/mol 7. P₂O₅: 141.94 g/mol
Answer for screen readers
- Carbon tetrachloride (CCl₄): 153.81 g/mol
- Silicon dioxide (SiO₂): 60.09 g/mol
- Trisilicon tetranitride (Si₃N₄): 140.31 g/mol
- Disulfur difluoride (S₂F₂): 102.14 g/mol
- Iodine pentabromide (IBr₅): 526.40 g/mol
- Nitrogen trichloride (NCl₃): 120.36 g/mol
- Diphosphorus pentoxide (P₂O₅): 141.94 g/mol
Steps to Solve
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Identify Chemical Formulae and Atomic Masses Gather the molecular formula for each substance and the atomic masses from the periodic table:
- Carbon (C): 12.01 g/mol
- Chlorine (Cl): 35.45 g/mol
- Silicon (Si): 28.09 g/mol
- Oxygen (O): 16.00 g/mol
- Nitrogen (N): 14.01 g/mol
- Sulfur (S): 32.07 g/mol
- Iodine (I): 126.90 g/mol
- Bromine (Br): 79.90 g/mol
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Calculate Molecular Mass of Carbon Tetrachloride (CCl₄)
- Formula: C + 4Cl
- Calculation: $$ 12.01 + 4(35.45) $$ $$ = 12.01 + 141.80 = 153.81 , \text{g/mol} $$
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Calculate Molecular Mass of Silicon Dioxide (SiO₂)
- Formula: Si + 2O
- Calculation: $$ 28.09 + 2(16.00) $$ $$ = 28.09 + 32.00 = 60.09 , \text{g/mol} $$
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Calculate Molecular Mass of Trisilicon Tetranitride (Si₃N₄)
- Formula: 3Si + 4N
- Calculation: $$ 3(28.09) + 4(14.01) $$ $$ = 84.27 + 56.04 = 140.31 , \text{g/mol} $$
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Calculate Molecular Mass of Disulfur Difluoride (S₂F₂)
- Formula: 2S + 2F
- Calculation: $$ 2(32.07) + 2(19.00) $$ $$ = 64.14 + 38.00 = 102.14 , \text{g/mol} $$
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Calculate Molecular Mass of Iodine Pentabromide (IBr₅)
- Formula: I + 5Br
- Calculation: $$ 126.90 + 5(79.90) $$ $$ = 126.90 + 399.50 = 526.40 , \text{g/mol} $$
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Calculate Molecular Mass of Nitrogen Trichloride (NCl₃)
- Formula: N + 3Cl
- Calculation: $$ 14.01 + 3(35.45) $$ $$ = 14.01 + 106.35 = 120.36 , \text{g/mol} $$
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Calculate Molecular Mass of Diphosphorus Pentoxide (P₂O₅)
- Formula: 2P + 5O
- Calculation: $$ 2(30.97) + 5(16.00) $$ $$ = 61.94 + 80.00 = 141.94 , \text{g/mol} $$
- Carbon tetrachloride (CCl₄): 153.81 g/mol
- Silicon dioxide (SiO₂): 60.09 g/mol
- Trisilicon tetranitride (Si₃N₄): 140.31 g/mol
- Disulfur difluoride (S₂F₂): 102.14 g/mol
- Iodine pentabromide (IBr₅): 526.40 g/mol
- Nitrogen trichloride (NCl₃): 120.36 g/mol
- Diphosphorus pentoxide (P₂O₅): 141.94 g/mol
More Information
The molecular mass is calculated by summing the atomic masses of the elements in a compound based on their respective quantities. This is crucial for stoichiometry in chemistry, allowing for effective calculations in reactions.
Tips
- Miscounting Atoms: It's common to miscount the number of atoms for an element in the formula; always double-check.
- Using Inaccurate Atomic Masses: Ensure the atomic masses are taken from a reliable source; periodic tables can have slight variations.
- Forgetting to Multiply: When there are multiple atoms of an element, ensure the mass is multiplied by the correct number.
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