Other Chemistry Answers

Calculate the volume of 0.0500 M EDTA needed to titrate the Ca and Mg in a 0.1612-g sample that is 92.5% dolomite, CaCO 3 ·MgCO 3

(184.4 g/mol)

What is the mass of chlorine-37 (24.23%), if the mass of chlorine-35 (75.77%) is

34.969g and the atomic mass of chlorine is 35.453 g?

What are the steps involved in calculating how many atoms exist in 100g of lithium?

1. Is time indicated in the picture
2. How about the temperature

In a saturated solution of Al(OH)₃, the concentration of OH⁻ is 2.6 x 10⁻⁵ mol/L. The concentration of Al³⁺ in mol/ L is which of the following?

1. 7.8 x 10⁻⁵
2. 8.7 x 10⁻⁶
3. 7.8 x 10⁻¹⁵
4. 2.6 x 10⁻⁵
5. 5.2 x 10⁻⁵

At 60°C, the reaction, PCl₅(g) ⇌ PCl₃(g) + Cl₂(g) has a K value of12.5. If the reaction quotient, Q, calculated from initial concentrations is 19.8 at 60°C, which of the following statements is correct?

1. the rate of the reverse reaction is equal to the rate of forward reaction
2. there is more reactant concentration than product concentration
3. the system is already at equilibrium
4. system must shift to the right to reach equilibrium
5. system must shift to the left to reach equilibrium

When 10.0 g of liquid nitrogen is vapourized, 4000 J of energy is released. What is the molar enthalpy of vapourization for liquid nitrogen? 

1. – 11.2 kJ/mol
2. + 5.6 kJ/mol
3. 0 kJ/mol
4. + 11.2 kJ/mol
5. – 5.6 kJ/mol

When 3-methylbutan-2-ol undergoes a dehydration reaction, the product will be?

1. 3-methylbutanal
2. 3-methylbut-1-ene
3. 2,3-dimethylbutane
4. 3-methylbutan-2-one
5. 3-methylbutanoic acid

An primary alcohol undergoing oxidation with excess potassium permanganate will produce a(n)?

1. ester
2. carboxylic acid
3. aldehyde
4. ketone
5. ether

An octahedral VSEPR shape is possible for which of the following central atoms?

1. P
2. O
3. N
4. C
5. S