What happens when acid reacts with metal carbonate​

What does x represent in the formula for the compound xcl4?

Suppose you have designed a new thermometer called the x thermometer. on the x scale the boiling point of water is 129 ? x and the freezing point of water is 13 ? x. part a at what temperature are the readings on the fahrenheit and x thermometers the same?

In the space, show a correct numerical setup for calculating the number of moles of co2 present in 11 grams of co2