General Chemistry Answers

3 Zn + 2 MoO3 → Mo2O3 + 3 ZnO

a. How many grams of ZnO can be formed when 20 g of MoO3 reacts with 20 g of Zn?

b. Identify the limiting reagent and excess.

c. How many grams of the other product can be produced?

d. Draw a picture of the system.

1. 0.0050 grams of a chemical is dissolved in 75 grams of water. 

What is the concentration of the chemical in parts per million? 

Calculate the ∆H for the reaction:

CS2 + 2 O2 CO2 + 2 SO2

Given:

∆Hf CO2 = -393.5 kJ/mol

∆Hf SO2 = -296.8 kJ/mol

∆Hf CS2 = 87.9 kJ/mol

A is an aqueous solution of H2SO4 of concentration 0.05 moldm3,B is put A intoa burette pipette 25cm3 of B into a conical flask and add two drops of methyl orange indicator

What is the concentration in moldm3 of NaOH in B given the equation for reaction H2SO4+2NaOH

What is the percentage purity of the NaOH

What is the percentage of the impurity present

1.             19.0g of aluminum reacts with 21.0 grams of chlorine gas to produce aluminum chloride. Which reactant is limiting, which is in excess?

2 Al + 3 Cl₂ à 2 AlCl₃

Give the given, unknown and full solution

1.             What mass of calcium sulfate can be produced from the reaction of 1250 g calcium phosphate with 750 g H₂SO₄?

Ca₃(PO₄) ₂ (s) +  H₂SO₄(aq) à   CaSO₄(s) + H₃PO₄(aq)

Give the given, unknown and full solution.

what property of water

A 1.00 mol sample of gas at 25 °C and 1.0 atm has an initial volume of 22.4 L. Calculate the results of each change, assuming all the other conditions remain constant.

b. The volume is reduced to 275 mL. What is the pressure in millimeters of mercury

Enzymes catalyze the degradation of biomolecules, like starch and cellulose, into simple sugar glucose. Why do you think can humans digest starch but not cellulose?

Titration of 0.7865 g sample of pure potassium hydrogen phthalate requires 35.73 ml of a NaOH solution. Calculate the molarity of the NaOH solution. This acid base reaction is:

NaOH + KHCgHD, NaKCH40+ H₂O