Assume a beaker of pure water has been boiling for 30 minutes. what is in the bubbles in the boiling water? a) heat. b) air. c) oxygen gas and hydrogen gas. d) gaseous water.

The bubbles in the boiling water is gaseous water.

Explanation:

The conversion of water into its vapors is a physical change.

Physical change is defined as the change in which, change in shape, size etc.. takes place. No new substance gets formed in these reactions.

For Example: Melting of ice

Vaporization is defined as the physical process in which liquid particles get converted to gaseous particles.

When water is boiling for 30 minutes, the water particles are getting converted to water vapors.

Hence, the bubbles in the boiling water is gaseous water.

yes

explanation:

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1. for the first question, we must find the mass of the anhydrous salt, mgso₄. the molar mass for mgso₄·7h₂o is 246.47 g/mol, while that of mgso₄ is 120.37 g/mol.7.834 g mgso₄·7h₂o * 1 mol mgso₄·7h₂o/246.47 g * 1 mol mgso₄/1 mol mgso₄·7h₂o * 20.37 g mgso₄/mol = 0.647 g mgso₄

2. mass of water = mass of sample - mass of anhydrous salemass of water = 7.834 - 0.647 = 7.19 gpercent water in hydrate = 7.19/7.834 * 100 = 91.74%