IB Chemistry - Stoichiometry

Silicone reacts with chlorine to for silicone tetrachloride, as shown in the following equation

Si(s) + Cl₂(g) ---> SiCl₄(l)

Calculate the mass of silicone tetrachloride obtained from 10.0g of silicon. [RAM: Si = 28, Cl = 35.5]

• 60.7g

• 170.0g

• 35.7g

• 121.4g

Tags

NGSS.HS-PS1-7

Silicone reacts with chlorine to for silicone tetrachloride, as shown in the following equation

Si(s) + Cl₂(g) ---> SiCl₄(l)

Calculate the minimum volume of chlorine that would be required to react completely with 10.0g of silicon. [1 mol of gas occupies 24dm³ under the conditions of the experiment]

• 8.57dm³

• 17.1dm³

• 67.2dm³

• 8.0dm³

Tags

NGSS.HS-PS1-7

Bromine consists of two isotopes, ⁷⁹Br (relative abundance 50.5%) and ⁸¹Br (relative abundance 49.5%). Calculate the relative atomic mass of Br.

• 79.99g/mol

• 80.01g/mol

• 79.98g/mol

• 80.00g/mol

A white powder used in paints, enamels and ceramics has the following mass percentage composition: Ba, 69.6% ; C, 6.09% and O, 24.3%. What is its empirical formula? (M_Ba = 137.3gmol^-1, M_C = 12.01gmol_-1, M_O = 16.00gmol^-1)

• BaCO₂

• Ba₂CO₂

• BaCO₃

• Ba₂CO₃

Tags

NGSS.HS-PS1-2

Bone and dental implants are often coated with calcium phosphate, Ca₃(PO₄)₂, to permit bone to bond with the implant surface. If a coating process can deposit 0.115 mole of pure Ca₃(PO₄)₂ on an implant, what is the mass of the coating? Given that the molar mass of Ca is 40.08gmol^-1, P is 30.97gmol^-1 and O is 16.00gmol^-1.

• 31.1g

• 15.5g

• 24.7g

• 35.7g

Estimate the mass of A required to completely react with 10 moles of B, given the following information:

i. A and B react to form A₅B₂

ii. A has a molar mass of 100.0gmol^-1

iii. B has a molar mass of 200.0gmol^-1

• 2.5kg

• 5.0kg

• 3.5kg

• 6.0kg

Tags

NGSS.HS-PS1-7

__C₂H₂(g) + __O₂(g) → __ CO₂(g) + __ H₂O(g)

When the equation above is balanced, what is the coefficient for oxygen?

• 4

• 5

• 6

• 7

Tags

NGSS.HS-PS1-7

What amount of oxygen, O₂, (in moles) contains 1.8 ×10²² molecules?

• 0.300

• 33.3

• 0.030

• 3.33

Tags

NGSS.HS-PS1-7

3.0 dm₃ of sulfur dioxide is reacted with 2.0 dm₃ of oxygen according to the equation below.

2SO₂(g) +O₂(g) → 2SO₃(g)

What volume of sulfur trioxide (in dm³) is formed? (Assume the reaction goes to completion and all gases are measured at the same temperature and pressure.)

Tags

NGSS.HS-PS1-7

Sodium reacts with water as follows.

2Na(s) + 2H₂O(l) ® 2NaOH(aq) + H₂(g)

1.15 g of sodium is allowed to react completely with water. The resulting solution is diluted to 250 cm³. Calculate the concentration, in mol/dm³, of the resulting sodium hydroxide solution.

Tags

NGSS.HS-PS1-5