Question

You start with a container that holds exactly 4 grams of nitrogen gas (N₂). According to your lab manual, the reaction to form ammonia requires nitrogen and hydrogen to combine in a mass ratio of 14 : 3. Given this information, calculate the mass of hydrogen gas (H₂) you need to react completely with your 4 grams of nitrogen gas.

Give the names of the elements present in the following compounds. (i) Table salt (ii) Slaked lime (iii) Vinegar (iv) Baking powder

How many atoms are present in a (i) CO₂ molecule (ii) NH₄⁺ ion

Write down the names of compounds represented by the following formulae: (i) KNO₂ (ii) H₂S (iii) K₂SO₄ (iv) MgCl₂

The mass of one steel screw is 4.11g. Find the mass of one mole of these steel screws. Compare this value with the mass of the Earth (5.98 × 10²⁴kg). Which one of the two is heavier and by how many times?