Which of the following correctly represents 360 g of water?i. 2 moles

1.	Which of the following correctly represents 360 g of water?i. 2 moles of H2Oii. 20 moles of wateriii. 6.022 x 1023 molecules of wateriv. 1.2044 x 1025 molecules of waterA. iB. I and ivC. ii and iiiD. ii and iv
Answer» 20 moles of water: Given: Number of moles = 20 Atomic mass of H₂O = 2 × 1 + 16 = 18g/mol To find out the mass of water, apply the formula given: Number of moles = \(\frac{Mass}{Molar\,mass}\) ⇒20 = \(\frac{mass}{18\,g/mol}\) ⇒ Mass = 20 mol × 18g/mol ⇒ Mass = 360 g 1.2044 x 10²⁵ molecules of water: 1 mole = 6.022 × 10²³ 1.2044 x 10²⁵ molecules = \(\frac{1.2044\times10^{23}}{6.022\times10^{23}}\) ⇒20 moles Mass of 20 moles of water is 360g. Thus, option D is correct.

Which of the following correctly represents 360 g of water?i. 2 moles of H2Oii. 20 moles of wateriii. 6.022 x 1023 molecules of wateriv. 1.2044 x 1025 molecules of waterA. iB. I and ivC. ii and iiiD. ii and iv

Answer»

20 moles of water:

Given: Number of moles = 20

Atomic mass of H₂O = 2 × 1 + 16 = 18g/mol

To find out the mass of water, apply the formula given:

Number of moles = \(\frac{Mass}{Molar\,mass}\)

⇒20 = \(\frac{mass}{18\,g/mol}\)

⇒ Mass = 20 mol × 18g/mol

⇒ Mass = 360 g

1.2044 x 10²⁵ molecules of water:

1 mole = 6.022 × 10²³

1.2044 x 10²⁵ molecules = \(\frac{1.2044\times10^{23}}{6.022\times10^{23}}\)

⇒20 moles

Mass of 20 moles of water is 360g.

Thus, option D is correct.