Question

calculate the number of moles in 150 grams of water.​

Answer 1

Answer:Hi there!

The molar mass of water is 18 grams. The mass of water, present in the given sample, is 100 grams.  

The number of moles in the sample can be calculated by dividing the mass given by molar mass.  

Moles = mass / molar mass

Moles = 100 grams / 18 grams

Moles = 5.56

The number of particles in a mole of a substance is 6.022 x 10²³. The total number of molecules in 5.56 moles of water is;

Number of molecules = 5.56 x 6.022 x 10²³

Number of molecules = 33.456 x 10²³

Cheers!

Explanation:

Answer 2

Given mass of water = 150 g

Molar mass of water (H₂O) = $\sf{2m_H + m_O}$

                                             = 2(1) + 16

                                             = 18 g mol⁻¹

${\boxed{\sf{ \bigstar \ Number \ of \ moles = {\dfrac{Given \ mass}{Molar \ mass}} }}}$

⇒ $\sf{ {\dfrac{150}{18}} }$ mol

⇒ 8.33 mol of water