নাইট্রোজেন ডাই অক্সাইড এর ৭ মোলের আণবিক ভর কত?
To solve this problem, let's analyze it step-by-step:

Step-1: Here, we know that the chemical formula of Nitrogen dioxide is NO2

Step-2: The atomic mass of N (Nitrogen) is 14, and the atomic mass of O (Oxygen) is 16.

Step-3: So, total mass for 1 mole of  NO2 is (14 + 16*2) = 46

Step-4: We have to find the mass for 7 moles of  NO2. So, mass for 7 moles is 7*46 = 322 

#Answer: 322
