Search & Filtering
Balance the half equation ionically, (Ag)2So4 + Cu = CuSo4 + Ag
15% of the human body mass is bone and 65% of the mass of human bone is Calcium. How many moles of calcium are there in a 155 pound person?
1. A 0.2500 g sample of a compound contain carbon, hydrogen and oxygen undergoes complete combustion to produce 0.3664 g of CO2 and 0.1500 g of H2O. Determine the empirical formula of this compound. [5 marks]
The gem emerald is a pure crystal of the mineral beryl, Be3Al2(SiO3)6 How many atoms of beryllium would be in 134.35 grams of beryl?
6. Which among the following amounts contains the most number of atoms?
a. 2.0 grams of potassium metal
b. 0.3 moles of hydrogen atoms
c. 1.204 x 1021 atoms of sulfur
d. 1.27 grams of iodine
Answer the following questions below including your solution.
2. Find the mass of 0.25 moles of the following substances
a. K2CrO4 c. SiH4
b. CH4 d. AlPO4 e. Ba(OH)2
3. How many moles are in 250 grams of
a. PbSO4 c. CH3CHO
b. Fe2O3 d. CH3CH2OH
4. Calculate the mass in grams of one molecule of
a. Bromine, Br c. Water, H2O
b. Sulfur, S8 d. Carbon disulfide, CS3
Which molecules always have the formula of X2?
How are the electrons in this molecule distributed?
A 0.250g sample of unknown acid requires 89.3 mL of 0.140 mol/L NaOH for complete neutralization. What is the molar mass of acid?
What volume of H2 at a pressure of 1.12 atm and a temperature of 40C can be prepared from the reaction of 20g of H2O
