How many moles are in 4.24kg of na2co3?
hint : you need to convert from kg to grams first
a. 4.00 x 10 -2 moles
b. 40.0 moles
c. 4.49 x 105 moles
d. 2.55 x 1028 moles

Based on the law of conservation of energy, which statement is false? answer- energy is lost when machines dont work right

Seltzer water is created by placing water under pressure with carbon dioxide gas. which of the following statements best describe seltzer water: a. the solution will be slightly acidic b. the solution will be slightly basic. the solution will be strongly acidic. d. the solution will be strongly basic. e. the solution will be neutral

Acompound has a molar mass of 92.02 grams/mole, and its percent composition is 30.4% nitrogen (n) and 69.6% oxygen (o). what is its molecular formula? a. n2o4 b. no2 c. n2o d. n4o2