Final answer:
Two-step molar conversions in chemistry require changing units twice, often starting with a conversion to a base unit like moles. The process typically involves using conversion factors that cancel out previous units, resulting in the desired unit, such as converting kilometers to millimeters in two steps.
Step-by-step explanation:
Two-step molar conversions in chemistry involve changing units twice to reach the desired unit. This method is especially useful when both the original and the desired units have prefixes. The first step in two-step conversions usually involves converting the initial quantity to a base unit, such as moles, followed by converting from this intermediate unit to the target unit.
To illustrate, consider a two-step molar conversion where you have a balanced chemical equation and need to convert between substances. The first conversion factor is used to convert amounts in equivalents to moles, and the second converts amounts in moles to equivalents of the ion. Each conversion factor cancels out the previous unit, leaving the desired unit.
For example, to solve a problem like converting 54.7 kilometers to millimeters, you might first convert kilometers to meters and then meters to millimeters, ensuring that the units cancel properly and that your final result is in millimeters.