NaF + HCL=> NACL + HF

Asap! how do you lengthen a pattern piece? (family and consumer science, sewing)

The solid xy decomposes into gaseous x and y: xy(s) m x(g) + y(g) kp = 4.1 (at 0 °c) if the reaction is carried out in a 22.4 l container, which initial amounts of x and y will result in the formation of solid xy?

What is the value of the standard enthalpy of formation of an element in its most stable form?