Question

for beryllium chloride, 0.076 moles of silver nitrate are used. for magnesium chloride, 0.064 moles of silver nitrate are used. for calcium chloride, 0.055 moles of silver nitrate are used. how many moles of agno₃ should we use to be sure that we have excess, no matter which of the three compounds it is? a) 0.025 mol b) 0.075 mol c) 0.050 mol d) 0.100 mol

Explanation:

Step1: Identify the maximum moles used

We are given the moles of silver nitrate used for different compounds. We need to find the maximum value among them to ensure excess. The values are 0.076 moles (for beryllium chloride), 0.064 moles (for magnesium chloride) and 0.055 moles (for calcium chloride).

Step2: Compare the values

Comparing 0.076, 0.064 and 0.055, we see that 0.076 is the maximum. To be sure of having excess, we need a value greater than 0.076.

Answer:

D. 0.100 mol