Kefahaman Kimia Tingkatan 4

A syringe contains 120 cm3 of ammonia, NH3 gas at room condition. How many number of ammonia molecules in this syringe?

How many molecules in 16.8 g of nitrogen gas, N2?

A mass of a sample of nitrogen gas, N2 is 0.56 g. What is the volume of this gas at STP?

Calculate the mass of 120 cm3 oxygen gas, O2 at room condition.

A balloon containing 120 cm3 of hydrogen gas, H2 at room condition. How many hydrogen atoms in this balloon?

Calculate the mass of 560 cm3 oxygen gas, O2 at STP.

Diagram below shows a syringe containing 360 cm3 of oxygen gas, O2 at room condition. What is the mass of this oxygen gas, O2?

Diagram below shows the gas cylinder containing cooking gas. How many hydrogen atoms in this gas cylinder?

Seashell contains 25.0 g of calcium, 7.5 g of carbon and 30.0 g of oxygen. Find the empirical formula of seashell.

Composition of ascorbic acid consist of 40.9% of carbon, 4.55% of hydrogen and the rest is oxygen. What is the empirical formula of ascorbic acid?