A chloride of a metal (M) has of chlorine. of vapour of the chloride of metal at STP weighs . The molecular formula of this metal chloride is:

Question

A chloride of a metal (M) has  of chlorine.  of vapour of the chloride of metal at STP weighs . The molecular formula of this metal chloride is:

Canvas Classes · Accepted Answer

🧠 Vapour mass at STP gives molar mass
At STP,  of gas fills . So if you know the mass of  of vapour, simple cross-multiplication gives the molar mass. Then use the chlorine  to count Cl atoms.

🗺️ The two-step plan
Molar mass: .
.

Chlorine count: Mass of Cl in one mole .
Number of Cl atoms .

So the formula is .

⚠️ Common mistake
Don't use  when the volume is in mL — match units. Either use  or convert your  to . A unit slip kills your molar mass by a factor of .

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