1 cup = 236mL
A cup is a unit of volume. To convert in grams, it depends on the ingredient!
Difference types of rising agents (levures)
It's so confusing sometimes. Good to have a summary here:
Français
English
Dansk
Levure chimique
Baking powder
Bagepulver
Bicarbonate de soude
Baking soda
Natron
Levure
Yeast
Gær
Baking soda is a baking ingredient that's activated by a liquid and an acid to help with leavening, or rising
Baking powder is a complete leavening agent, meaning it contains both baking soda and an acidic ingredient (such as cream of tartar -- crème de tartare i.e. hydrogénotartrate de potassium). It also sometimes contains some corn starch (amidon de maïs) to preserve the powder over time.
Baking soda is 3 to 4 times stronger than baking powder.
Yeast on contrary to the two previous ones, is living matter.