Question

5) What volume of oxygen gas reacts with 20.0 mL of hydrogen chloride (Assume temperature and pressure remain constant.) -HCK(g) + _021) _Cl2(g) + H2O(9) A) 5.00 mL B) 10.0 mL C) 20.0 mL D) 40.0 mL E) none of the above 6) What volume of oxygen gas reacts with 5.00 mL of methane, CH47 (Assume temperature and pressure remain constant.) _CH4(9) + _O2(g) spark _CO2(g) + _H20(9) A) 2.50 mL B) 5.00 mL C) 10.0 mL D) 20.0 mL E) none of the above 7) Considering the limiting reactant concept, how many moles of copper(I) sulfide are produced from the reaction of 3.00 mol of copper and 1.00 mol of sulfur? 2 Cu(s) + s(s) 4, Cu2S(s) A) 1.00 mol B) 1.50 mol C) 4.00 mol D) 6.00 mol E) none of the above 8) Starting with 1.56 g of salicylic acid, a student prepares 1.75 g of aspirin. If the calculated mass of aspirin is 1.88 g, what is the percent yield?

Answer 1

(5) solution

4HCL(g) +1O_2(g)=2CL₂ + 2H₂O(g)

we can say that there 4 mole HCL reaction with 1 mole oxygen gas

from question, value of hcl=20.0 ml which is 4 mole

so we calculate the value of oxygen =20.0/4 ml

=5.0 ml

6) from reaction equation

CH₄(g) +O₂(g) = CO₂(g) + 2H₂O(g)

we can notice there is 1 mole CH₄ reaction with 1 mole oxygen so both mole are same.

so it is clear that 5 ml O₂ need when 5 ml CH₄ present.

so oxygen is needed there 5ml

7) the reaction equation is

2cu(s) +s(s) = cu₂s(s)

where 2 mole CU reaction with 1 mole S the the product is 1 mole of CU₂S

If 3.0 mole cu and 1.0 mole s

total mole of left side=total mole of right side

3.0 mole+ 1.0 mole=cu₂s  mole

cu_2s mole= 4.0 mole

so answer is 4.0 mole