To determine how many moles of [tex]\( K_2CrO_4 \)[/tex] are present in 100 mL of 0.40 M [tex]\( K_2CrO_4 \)[/tex], let's follow these steps:
1. Understand the given data:
- Volume of [tex]\( K_2CrO_4 \)[/tex] solution = 100 mL
- Concentration of [tex]\( K_2CrO_4 \)[/tex] solution = 0.40 M (moles per liter)
2. Convert the volume from mL to L:
- Volume in liters = [tex]\(\frac{100\text{ mL}}{1000}\text{ L} = 0.100\text{ L}\)[/tex]
3. Use the definition of molarity (M) which is moles per liter (mol/L) to find the number of moles of [tex]\( K_2CrO_4 \)[/tex]:
- Moles of [tex]\( K_2CrO_4 \)[/tex] = Molarity [tex]\(\times\)[/tex] Volume in liters
- Moles of [tex]\( K_2CrO_4 \)[/tex] = 0.40 M [tex]\(\times\)[/tex] 0.100 L = 0.040 moles
Therefore, the number of moles of [tex]\( K_2CrO_4 \)[/tex] present in 100 mL of 0.40 M [tex]\( K_2CrO_4 \)[/tex] is approximately [tex]\( 0.040 \)[/tex] moles.
