Phosphorus trichloride, PCl3, decomposes to form elemental phosphorus and chlorine. The equation is: 4PCl3 → P4 + 6Cl2. Balance
2 answers:
Answer: 19.4 grams of chlorine
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
According to avogadro's law, 1 mole of every substance weighs equal to the molecular mass and contains avogadro's number of particles.
4 moles of decompose to give 6 moles of
of
decompose to give
of
Thus 25 g of decompose to give
of
Thus 19.4 grams of chlorine will be produced.
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Answer:
Explanation:
To convert from grams to moles, the molar mass is used. These values tells us the grams in 1 mole of a substance. They can be found on the Periodic Table (they are equivalent to the atomic masses, but the units are grams per mole).
We are given the compound C₈H₁₈. Look up the molar masses of the individual elements.
- Carbon (C): 12.011 g/mol
- Hydrogen (H): 1.008 g/mol
Notice there are subscripts that tell us the number of atoms of each element. We must multiply the molar masses by the subscripts.
- C₈: 8(12.011 g/mol)=96.088 g/mol
- H₁₈: 18(1.008 g/mol)=18.144 g/mol
Add these 2 values together to find the molar mass of the whole compound.
- C₈H₁₈: 96.088 g/mol +18.144 g/mol=114.232 g/mol
Use this number as a ratio.
Multiply by the given number of moles: 7.5
The moles of C₈H₁₈ will cancel each other out.
7.5 moles of C₈H₁₈ is equal to <u>856.74 grams of C₈H₁₈</u>