The astronaut then measures the abundance of silicon on the new planet, obtaining the following results: isotope abundance (%) mass (amu) 28si 73.71 27.98 29si 14.93 28.98 30si 11.36 29.97 what is the atomic mass of silicon for this planet?

Use examples from the article to explain one positive and one negative effect that chemistry has had on society

How many grams of magnesium metal will react completely with 8.3 liters of 5.5 m hcl? show all of the work needed to solve this problem. mg (s) + 2hcl (aq) → mgcl2 (aq) + h2 (g)

Ethanol (c2h5oh) is produced from the fermentation of sucrose in the presence of enzymes. c12h22o11(aq) + h2o(g) 4 c2h5oh(l) + 4 co2(g) determine the theoretical yield and the percent yields of ethanol if 680. g sucrose undergoes fermentation and 326.5 g ethanol is obtained. theoretical _ g _ percent %