Question

What is the mass for 3.01*10 23 molecules h2o

Answer 1

M H₂O: 1g×2 + 16g = 18g


6,02×10²³ --------- 18g
3,01×10²³ --------- Xg
X = (18×3,01×10²³)/6,02×10²³
X = 9g

:)

Answer 2

Answer:

The answer is 8.99 g of water

Explanation:

First we calculate the molecular mass of water, as follows. using the periodic table we have the masses of hydrogen and oxygen:

MW of H2 2 x 1 g/mol=2g/mol

MW of O: 16 g/mol

MW of H2O=2+16=18 g/mol

using Avogadro's number and making a simple direct rule of three we have:

6.023x$10^{23}$mol----------------------18 g

3.01x$10^{23}$ mol------------------------ Xg

Clearing the X, we have:

$X = \frac{18 g x 3.01x10^{23}mol }{6.023x10x^{23} mol}=8.99 g of water$