A flask contains 35.4 mL of a 3.76 M aqueous solution of KMnO4. A student adds 300.0 mL of water to the flask. What is the concentration of KMnO4 in the flask after the addition of the water? 

Which of the quantities below are equal in number of atoms present?  3.0 mol carbon disulfide 4.0 mol krypton gas  2.0 mol gaseous fluorine  

Which of the following statement(s) is/are correct  Sample A can be a representation of a flask containing helium gas and hydrogen gas. Sample B can be a representation of a flask containing sulfur dioxide gas. Sample C can be a representation of a flask containing nitrogen monoxide gas. 

Which of the following statement(s) is/are correct?   Ag is the symbol for silver H is the symbol for hydrogen S is the symbol for sodium 

A 36.0 g sample of an unknown metal is heated from 25oC to 35oC and 171.7 J of heat is absorbed. Use the chart below to identify the unknown metal.  

Which of the molecules below have resonance structures?  Number 1 has resonance structures Number 2 has resonance structures Number 3 has rresonance structures

Determine the molarity of a solution when 17.21 g of the hypothetical molecule Q2X6 is dissolved in enough water to create 225.0 mL of solutions. (Use the information about the elements provided below.)

Determine the amount of heat released (in kilojoules) when 18.20 grams of ethane, C2H6, undergoes combustion according to the following equation: 2C2H6 (g) + 7O2 (g) 

Given the following equations:  Reaction  △H  2 A(s) + 3 B (g) ⟶ 2 C (s)  -800.0 kJ  D(s) + 2 B (g) ⟶ E (s)   -640.1 kJ  Determine the enthalpy change (in kJ) for the reaction below and whether the reaction is exothermic or endothermic.  3 E (s) + 4 A (s) ⟶ 4 C (s) + 3 D (s)   

Which of the following statement(s) is/are correct  Sample A can be a representation of a flask containing carbon monoxide gas.  Sample B can be a representation of a flask containing nitrogen dioxide gas. Sample C can be a representation of a flask containing helium gas and hydrogen gas.