Chemistry Stoichiometry

Which volume, in cm³, of 0.20 mol dm^-3 NaOH (aq) is needed to neutralize 0.050 mol of H₂S(g)? H₂S(g) + 2NaOH(aq) → Na₂S(aq) + 2H₂O(l)

• 0.25

• 0.50

• 250

• 500

In which mixture is NaOH the limiting reagent?

• 0.20mol NaOH + 0.10mol H₂SO₄

• 0.10mol NaOH + 0.10mol H₂SO₄

• 0.20mol NaOH + 0.10mol HNO₃

• 0.10mol NaOH + 0.10mol HNO₃

The complete combustion of 15.0cm³ of a gaseous hydrocarbon X produces 60.0 cm³ of carbon dioxide gas and 75.0 cm³ of water vapour. What is the molecular formula of X? (All volumes are measured at the same temperature and pressure.)

Tags

NGSS.HS-PS1-7

4.0 g of solid sodium hydroxide is added to 0.10 dm3 of 1.0 mol dm⁻³ aqueous sulfuric acid. 2NaOH(s) + H₂SO₄(aq) → Na₂SO₄(aq) + 2H₂O(l) Which statement is correct?

• Neither reactant is in excess.

• 0.10 mol Na₂SO₄ is formed

•  Excess H₂SO₄ remains in solution

• Excess NaOH remains in solution.

Tags

NGSS.HS-PS1-7

0.040 mol of (NH₄)₂Ni(SO₄)₂•6H₂O is dissolved in water to give 200 cm³ of aqueous solution. What is the concentration, in mol dm^-3, of ammonium ions?

• 0.00040

• 0.0080

• 0.20

• 0.40

When sodium bromate(V), NaBrO₃, is heated, it reacts according to this equation. 2NaBrO₃(s)→2NaBr(s)+3O₂(g) What amount, in mol, of NaBrO₃ produces 2.4 dm³ of oxygen gas, measured at room temperature and pressure? (Molar volume of gas =24 dm³mol⁻¹ at room temperature and pressure.)

• 0.017

• 0.067

• 0.10

• 0.15

Aluminium carbide reacts with water according to the equation below. What is the sum of all the coefficients when the equation is balanced? __Al4C3(s) + __ H2O(l) → __ Al(OH)3(s) + __ CH4(g)

• 13

• 14

• 19

• 20

What is the amount, in mol, of BaSO₄ produced?

• 0.0050

• 0.10

• 0.50

• 0.10

Tags

NGSS.HS-PS1-7

What is the sum of the coefficients when the equation is balanced with whole numbers?

__MnO₂ (s) + __HCl (aq) → __MnCl₂ (aq) + __H₂O (l) + __Cl₂ (g)

• 6

• 7

• 8

• 9

What is the sum of the integer coefficients when propene undergoes complete combustion?

• 11

• 17

• 21

• 23