stoichiometry & mole concept

Mg + H₂SO_{4 →} MgSO_{4 +} H₂

In this reaction, What is the mass of magnesium sulfate formed when 6g of magnesium react with excess sulfuric acid.

[A_r: H,1; O,16; Mg,24; S,32]

• 8

• 24

• 30

• 60

A compound X contains 82.76% of carbon by mass and 17.24 of hydrogen by mass. The empirical formula of compound X is:

• C₆H₅

• C₂H₅

• C₃H₈

• CH₃

Compound X has and empirical formula of C₂H₅ and a molecular mass of 58. The molecular formula of X is:

• C₆H₁₂O₆

• C₄H₁₀

• C₂H₅OH

• CH₃COOH

Tags

NGSS.HS-PS1-1

Which two of the following contain the same number of molecules?

• 2.0g of Methane, CH₄

• 8.0g of Oxygen, O₂

• 2.0g of Ozone, O₃

• 8.0g of Sulfur dioxide, SO₂

4.8g of calcium is added to 3.6g of Water. The following reaction occurs.

Ca + 2H₂O → Ca(OH)_{2 +} H₂

What Reagent is in excess?

• Calcium

• Water

In the same reaction where 4.8g of calcium is added to 3.6g of Water.

Ca + 2H₂O → Ca(OH)_{2 +} H₂

What is the mass of the excess reagent that remained at the end of the experiment

• 8g

• 0.08g

• 0.8g

• 88g

Tags

NGSS.HS-PS1-7

Ethanol is manufactured from Glucose C₆H₁₂O₆ by fermentation

C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂

In an experiment, 30.0g of glucose was fermented.

What is the number of moles of glucose in 30.0g

• 0.157

• 0.167

• 0.186

• 0.159

C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂

Using the equation, Calculate the maximum mass of ethanol that could be obtained from 30.0g of glucose.

• 15.3g

• 14.5g

• 10.6g

• 20.8g

C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂

Using the equation, Calculate the volume of carbon dioxide at r.t.p that can be obtained from 30.0g of glucose

• 4.008 dm³

• 8.016 dm³

• 4008 cm³

• 4008 dm³

Water is formed when 48g of Oxygen combine with 6g of hydrogen.

What mass of Oxygen combines with 2g of Hydrogen?

• 12g

• 16g

• 96g

• 144g

Tags

NGSS.HS-PS1-7