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Chemistry
A Level

Flask Q (volume = 1.00 x 103 cm3 ) is filled with ammonia (NH3) at 102 kPa and 300 K. Calculate the mass of ammonia in flask Q. (Gas constant R = 8.31 J K−1 mol−1 )

n = PV/RT 102 000 ×(1.00 × 10−3) / 8.31 × 300 = 𝑛 n= (4.091456077x10-2) Mass = n x 17 = 0.696g (3 sig figs only)

Answered by Ashley R. Chemistry tutor
6185 Views

What is a stereoisomer?

Stereoisomers are molecules with the same structural formula (same number of each type of atom bonded together in the same order e.g. carbon bonded to carbon bonded to oxygen) but with the atoms arranged ...

Answered by Lizzi G. Chemistry tutor
3036 Views

Explain how the electron pair repulsion theory can be used to deduce the shape of, and the bond angle in, PF3 .

Number of electrons from P= 5 e , Number of electrons from 3F = 3 e , Total number of electrons around P = 8 e Therefore there is a total number of 4 electron pairs surrounding P. three of which are bond ...

Answered by Yusuf A. Chemistry tutor
2893 Views

State the meaning of the term first ionisation energy

Energy (or enthalpy) needed to remove one electron from one atom.

Answered by Azobir E. Chemistry tutor
1783 Views

What is a transition metal complex?

A transition metal complex is a central metal ion (for example platinum) surrounded by ligands.  Ligands are ions or small molecules that donate a pair of electrons to the central metal ion and surround i...

Answered by Jessica B. Chemistry tutor
2563 Views

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