In a chemical reaction 15.5 grams of sodium reacted. If the total amount of sodium at the start of the reaction was 18.3 what percent of sodium reacted?

Which of these properties, used alone, would be least useful in identifying most minerals? a. color b. luster c. streak d. density

Consider the reaction: n2(g) + o2(g) ? 2no(g) kc = 0.10 at 2000oc starting with initial concentrations of 0.040 mol/l of n2 and 0.040 mol/l of o2, calculate the equilibrium concentration of no in mol/l how would this be done?

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.