The number of moles in the resulting solution can be calculated by adding together the number of moles from the individual solution. That is calculated as follows,

total number of moles = (35 mL)(1 L/1000 mL)(1 mole/L) + (60 mL)(1 L/1000 mL)(0.6 moles / L) = 0.071 moles

The precipitation reaction is,

KBr + AgNO3 --> AgBr + KNO3

From the equation, each mole of the KBr will need one mole of AgNO3. Hence, 0.071 mole of AgNO3 will also be needed. Calculating for the mass,

mass of AgNO3 = (0.071 moles)(169.87 g / mol) = 12.06 g

ANSWER: 12.06 grams

4 0

3 years ago

Which of the following statements about metal elements is correct?

Sati [7]

Answer: C. Metals tend to easily lose their valence electrons.

Explanation:

Metals are those substances which have tendency to loose their valence electrons to attain noble gas configuration and forms positive ions called as cations.

Example: Gold, potassium etc

$M\rightarrow M^++e^-$

Non metals are those substances which have tendency to gain valence electrons to attain noble gas configuration and form negative ions called as anions.

Example: Sulphur, Chlorine

$N+e^-\rightarrow N^-$

4 0

3 years ago

Find the volume of 2.40 moles of gas whose temperature is 50.0°C and whose pressure is 2.00 atm.

DanielleElmas [232]

PV=nRT
n=2.4 moles
T=273.15+50=323.15K
P=2*101325=202650 Pa
R=8.31

Solve for V:
V=nRT/P=2.4*8.31*323.15/202650=.032m^3

5 0

3 years ago