Answer: 1.4 moles
Step-by-step explanation:
I can only assume you are looking for the amount of moles in 0.4M. the capital M means Molarity.
Molarity=moles of solute/liters of solution
Since we know the molarity is 0.4, we can plug this into our equation
![0.4M=(xmoles)/(3.5L)](https://img.qammunity.org/2021/formulas/chemistry/middle-school/wwpbmum9iv7tjb7pclkpe61ftpe4wkg3lf.png)
moles= 1.4