HW #6: March 3rd Independent Practice

The total number of molecules in 34.0 grams of NH₃ is equal to

• 1.00 × 22.4

• 2.00 × 22.4

When a sample of Mg(s) reacts completely with O₂(g), the Mg(s) loses 2.5 moles of electrons. How many moles of electrons are gained by the O₂(g)?

• 10.0 mol

• 5.0 mol

• 1.0 mol

• 2.5 mol

A student intended to make a salt solution with a concentration of 10.0 grams of solute per liter of solution. When the student’s solution was analyzed, it was found to contain 8.90 grams of solute per liter of solution. What was the percent error in the concentration of the solution?

• 8.90%

• 11.0%

• 1.10%

• 18.9%

Given the balanced equation representing a reaction: 4NH₃(g) + 5O₂(g) → 4NO(g) + 6H₂O(g) What is the number of moles of H₂O(g) formed when 2.0 moles of NH₃(g) react completely?

• 6.0 mol

• 2.0 mol

• 3.0 mol

• 4.0 mol

What is the total number of moles of solute in 250 milliliters of a 1.0 M solution of NaCl?

• 1.0 mole

• 0.25 mole

• 0.50 mole

• 42 moles

What is the total number of moles of solute contained in 0.50 liter of 3.0 M HCl?

• 1.0

• 1.5

• 3.0

• 3.5

What is the total number of moles of O₂(g) required for the complete combustion of 1.5 moles of C₃H₈(g)?

• 0.30 mol

• 1.5 mol

• 4.5 mol

• 7.5 mol

Tags

NGSS.HS-PS1-7

One mole of bromine gas, Br₂, has a mass of

• 35.0 g

• 79.9 g

• 70.0 g

• 159.8 g

What is the total mass of water formed when 6 grams of hydrogen reacts completely with 50 grams of oxygen?

• 72 g

• 18 g

• 36 g

• 56 g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

According to the reaction H₂ + Cl₂ → 2 HCl, the production of 2.0 moles of HCl would require 70. grams of Cl₂ and

• 1.0 g of H₂

• 2.0 g of H₂

• 3.0 g of H₂

• 4.0 g of H₂

Tags

NGSS.HS-PS1-7