Question

Q.8 How many moles are present in 40 g of He? * 1 point A)10 moles B) 11 moles C)13moles D)12 moles

Answer 1

10

Explanation:

molar mass= 4 g

mass in gram=40 g

number of moles= mass in grams/molar mass

so, 40/4= 10

Answer 2

Answer:

Correct option is

A) 10 moles

Molar mass of Helium =4g

The given mass of Helium =40g

Thus the number of moles of Helium = given mass/molar mass

                                                              = 40/4

                                                              = 10 moles