Question

Calculate the mass of 1 x 1025 molecules of water.

Answer 1

Answer:

Therefore 10²⁵ molecule of water has mass = 298 grams

Explanation:

Hope that the question says 1×10²⁵ molecules, not 1025 molecules.

Water has the molecular formula H₂O

So, the molecular mass = 18$g/mol$

One mole of water has 6.022×10²³ molecules

That means 6.022×10²³ molecules of water have a mass of 18 grams.

So one molecule has = 18÷(6.022×10²³) =2.98×10⁻²³ grams

Therefore 10²⁵ molecule of water has mass = 2.98×10⁻²³×10²⁵ = 298 grams