Solution Stoichiometry

Hydrogen gas will react with nitrogen gas to form ammonia (nitrogen trihydride). If 16.0 L of hydrogen gas is reacted with excess nitrogen gas at STP, what volume of ammonia will form?

• 10.7 L NH₃

• 24.0 L NH₃

• 16.0 L NH₃

• 32.0 L NH₃

Tags

NGSS.HS-PS1-7

You want to make 0.250 L of sodium chloride solution at a concentration of 0.800M. What mass of NaCl is needed to dissolve in 1 L of solution?

• 292 g NaCl

• 187 g NaCl

• 11.7 g NaCl

• 0.00342 g NaCl

Calcium carbonate undergoes a decomposition reaction when heated forming calcium oxide and carbon dioxide. If 60.0 g of calcium carbonate are heated and 15.0 g of calcium oxide are collected, what is the percent yield?

• 224 %

• 2.24 %

• 44.6 %

• 0.446 %

Tags

NGSS.HS-PS1-7

Given the thermochemical equation: N_2(g) + 3 H_2(g) → 2 NH_3(g) ΔH = −91.8 kJ/mol How much energy is given off when 222.4 g of N₂ reacts?

• -67.8 KJ

• -729 KJ

• 67.8 KJ

• - 11.6 KJ

Tags

NGSS.HS-PS1-4

How many mL of 0.5M HNO₃ would be needed to react with 85mL of 0.75M KOH?

• 127.5mL

• 0.1275mL

• 31.9mL

• 0.031875mL

What would the molarity of the solution be if 0.475 mol of KNO₃ were formed in this reaction and the final volume of the solution was 595mL

• 0.798M

• 1.25M

• 282.6M

• 7.98x10^-4M

Tags

NGSS.HS-PS1-7

What is the molarity of a 0.5L sample of a solution that contains 60.0 g of sodium hydroxide (NaOH)

• 0.8 M

• 1.5M

• 3.0M

• 6.0M

Molarity is:

• moles per liter of solution

• written with a unit of M

• calculated by dividing the moles of a substance by the liters of solvent

• all of the above

Calcium carbonate reacts with aqueous hydrochloric acid to form calcium chloride solution, water, and carbon dioxide gas in the following equation: CaCO₃ (s) + 2 HCl --> CaCl₂ (aq) + H₂O (l) + CO₂ (g) What volume (in mL) of 1.35 M HCl will be needed to completely react with 3.82 g of solid CaCO₃?

• 56.5 mL

• 47.2 mL

• 61.6 mL

• 34.7 mL

• 124 mL

Tags

NGSS.HS-PS1-7

Solid iron (II) sulfide reacts with hydrochloric acid to form hydrogen sulfide gas and aqueous iron (II) chloride: FeS (s) + 2 HCl (aq) --> H2S (g) + FeCl2 (aq) If 145 mL of HCl is needed to completely react with 25 g of iron (II) sulfide, what is the concentration of the HCl solution?

• 3.1 M

• 0.68 M

• 2.7 M

• 9.0M

• 3.9 M

Tags

NGSS.HS-PS1-7