How many grams are in 1.2 x 10²⁴ molecules of CO? (molar mass of CO = 28 g/mol)

How many moles of methane are required to produce 22g of CO₂(g) after combustion ?

A hydrocarbon fuel is fully combusted with oxygen to yield 23.118 g of carbon dioxide and 4.729 g of water. Find the empirical formula for the hydrocarbon.

12.915 g of a biochemical substance containing only carbon, hydrogen, and oxygen was burned in an atmosphere of excess oxygen. Subsequent analysis of the gaseous result yielded 18.942 g carbon dioxide and 7.749 g of water. Determine the empirical formula of the substance.

The combustion of 0.202 g of an organic compound produces 0.361 g of CO₂ and 0.147 g of water. Determine the molecular formula of the compound if it consists of C, H and O and has the molar mass of 148 g/mol.

Estrone contains carbon, hydrogen and oxygen atoms. The analysis of the completed combustion of 1.893 g of estrone sample produces 5.545 g CO₂ and 1.388 g H₂O. If the molar mass of estrone is 270.36 g/mol, determine the molecular formula of estrone.

20 cm³ of a gaseous hydrocarbon reacts with 60 cm³ of oxygen to produce 40 cm³ of carbon dioxide.

200 cm³ of a gaseous hydrocarbon reacts with 1300 cm³ of oxygen to produce 800 cm³ of carbon dioxide. Determine the molecular formula of the hydrocarbon.

10 cm³ of a gaseous hydrocarbon underwent complete combustion in 80 cm³ of oxygen (reagent in excess), the remaining gases occupied 60 cm³. On passing the gases through NaOH, the volume decreased by 40 cm³. Determine the molecular formula of the hydrocarbon (All volumes were measured under room conditions).

Calculate the volume of oxygen required for complete combustion of 100 cm³ of propene.

                                    2C₃H₆  +  9 O₂  → 6CO₂  + 6H₂O

Calculate the volume of carbon dioxide produced from complete combustion of 100 cm³ of propene.

                                    2C₃H₆  +  9 O₂  → 6CO₂  + 6H₂O

Calculate the volume of ammonia produced from 1200 cm³ of hydrogen reacting with nitrogen.

N₂ + 3H₂ ----> 2NH₃

What is the concentration of a HCl solution if 24.7 cm³ of HCl are completely neutralized by 35.8 cm³ of a 0.25 M NaOH solution?

The reaction of sulfuric acid (H₂SO₄) with Sodium hydroxide (NaOH) is described by the equation:

H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O

Suppose 50 cm³ of NaOH with unknown concentration is placed in a flask with bromthymol blue indicator. A solution of 0.20 mol/dm³ H₂SO₄ is dripped into the NaOH solution. After exactly 25.0 cm³ of H₂SO₄ is added, the indicator changes from blue to yellow. What is the concentration of the KOH?

30cm³ of NaOH is neutralised by 12.3 cm³ of 7.3 g/dm³ HCl. What is the concentration of the NaOH.

What volume of 0.5 mol/dm³ H₂SO₄ are required to neutralize 25 cm³ of 0.1 mol/dm³ Ba(OH)₂?

Calculate the volume of a 0.02 mol/dm³ Ba(OH)₂ solution required to completely neutralize 50 cm³ of a 0.2 mol/dm³ HNO₃ solution.

Ba(OH)₂ + 2HNO₃ ----> Ba(NO₃)₂ + 2H₂O

If it takes 25 cm³ of 0.05 M HCl to neutralize 250 cm³ of KOH solutions, what is the mass concentration of the KOH solution? (A_r H-1; O-16; K-39)

The reaction of sulfuric acid (H₂SO₄) with Potassium hydroxide (KOH) is described by the equation:

H₂SO₄ + 2KOH → K₂SO₄ + 2H₂O

Suppose 50 cm³ of KOH with unknown concentration is placed in a flask with bromthymol blue indicator. A solution of 0.20 M H₂SO₄ is dripped into the KOH solution. After exactly 25.0 cm³ of H₂SO₄ is added, the indicator changes from blue to yellow. What is the concentration of the KOH?