Question

1. silver nitrate is used to make several different silver halides used in photographic films. how many formula units of agno3 are there in 3.25 mol of agno3? (0.5 points) *

3.81 x 10²² formula units
1.96 x 10²⁴ formula units
2.38 x 10²² formula units
1.96 x 10²³ formula units

Explanation:

Step1: Recall Avogadro's number

Avogadro's number is \( 6.022 \times 10^{23} \) formula units per mole.

Step2: Use the formula to calculate formula units

The number of formula units \( = \) moles \( \times \) Avogadro's number.
Given moles of \( \text{AgNO}_3 = 3.25 \) mol.
So, number of formula units \( = 3.25 \, \text{mol} \times 6.022 \times 10^{23} \, \text{formula units/mol} \)
\( = 3.25 \times 6.022 \times 10^{23} \)
\( \approx 19.5715 \times 10^{23} \)
\( = 1.95715 \times 10^{24} \approx 1.96 \times 10^{24} \) formula units.

Answer:

B. \( 1.96 \times 10^{24} \) formula units