Q2 M8 - PERCENTAGE COMPOSITION

Suppose you were asked to prepare 250-g chocolate mousse which is 35% chocolate, 30% cream, 20% milk, 10% sugar and 5% butter, how much cream are you going to use?

• 60 g cream
• 62 g cream
• 73 g cream
• 75 g cream

How many percent of hydrogen (H) is present in water (H2O: H-1 & O-16)?

• 0.1
• 0.11
• 0.12
• 0.13

A bag of NPK fertilizer marked 16-4-8 contains 16% nitrogen, 4% phosphorous and 8% potassium. The other 72% is usually inert filler material, such as clay pellets or granular limestone. What is the mass of nitrogen present in 500g pack of NPK fertilizer?

• 10g
• 20g
• 40g
• 80g

How can you apply knowledge on percentage composition?

• In maintaining the quality of food product.
• In checking the amount of sugar present in the soft drink.
• In identifying the correct amount of substance present in a sample.
• All of the above

The label of the dark chocolate indicates that its mass is 150g and it is 70% cacao, if you consume the whole chocolate bar, how much cacao did you eat?

• 50 g cacao
• 100 g cacao
• 105 g cacao

The roots of the plants absorb the nutrients from the soil. For the farmers, it is important to strengthen the root system of their plants to ensure its growth. Potassium is the mineral responsible for a healthy root system. If you were a farmer, which of the following fertilizers would you use? (Given: K-39, Cl-35, O-16, C-12 and S-32)

• KCl
• K2O
• K2CO3
• K2SO4

The presence of SO2 in the atmosphere causes acid rain. How many percent of sulfur is present in SO2 (Molar Mass = 64 g/mole)?

• 0.4
• 0.49
• 0.5
• 0.6

Ammonium nitrate (NH4NO3 Molar Mass = 80 g/mole) is a substance used to produce dinitrogen monoxide (N2O), a dental anesthetic. What is the mass percent of N in ammonium nitrate?

• 0.35
• 0.39
• 0.4
• 0.43

In cold areas, many fish and insects, including the common housefly produce large amounts of glycerol (C3H8O3 Molar Mass = 92 g/mole) to lower the freezing point of their blood. How many percent of oxygen is present in glycerol?

• 0.5
• 0.51
• 0.52
• 0.53

How many percent of sodium (Na) is present in baking soda (NaHCO3)?

• 0.22
• 0.23
• 0.25
• 0.27