Final answer:
If the pressure reading from the barometer is recorded higher than it actually is, the reported molar mass of the liquid would be unaffected.
Step-by-step explanation:
When the barometer records a pressure reading higher than the actual pressure, the reported molar mass of the liquid remains unaffected. The barometer's reading is intricately linked to the height of the liquid column, a measure independent of the liquid's molar mass. Inaccuracies in pressure readings don't skew the determination of the molar mass since the relationship between pressure and liquid height is consistent.
Essentially, the barometer serves as a reliable indicator of atmospheric pressure, unaffected by the specific characteristics of the substance being measured. Consequently, any discrepancy in the pressure reading doesn't compromise the accuracy of the molar mass determination, as this parameter relies solely on the height of the liquid column, impervious to variations in pressure caused by factors external to the liquid itself.