Mastering chemistry Questions

UB ForumCategory: Mastering ChemistryMastering chemistry Questions
Selena TateSelena Tate Staff asked 5 years ago

If the reaction yield is 94.4%, what mass in grams of hydrogen is produced by the reaction of 4.73 g of magnesium with 1.83 g of water?

Mg(s)+2H2O(l)→Mg(OH)2(s)+H2(g)

a) 0.219
b) 0.204
 c) 0.0162
 d) 0.0485
e) 0.0962

 

A 17.5 mL sample of an acetic acid (CH3CO2H) solution required 29.6 mL of 0.250 M NaOH for neutralization. The concentration of acetic acid was __________ M.

 

a) 6.88
 b) 0.423
 c) 134
 d) 0.214
 f) 0.158

What is the empirical formula of a compound that is 40.9% C, 4.6% H, and 54.5% O by mass?

 

a) C 3 H 4 O 3
 b) C 3 H 5 O 3
 c) C 6 H 8 O 6
 d) C 3 HO 3
 e) C 9 HO 12