Use the Lewis dot structure (make sure you show all electron pairs) and VSEPR theory to predict the molecular geometry and bond angle in the ammonium ion NH4+. Hint: Use the table below to answer the question.   VSEPR quick reference: electron groups, shapes, and approximate bond angles Electron Groups Bonding Groups Lone Pairs Electron Geometry Molecular Geometry Approximate Bond Angles 2 2 0 Linear Linear 180° 3 3 0 Trigonal planar Trigonal planar 120° 3 2 1 Trigonal planar Bent

The limiting reagent (reactant) in a chemical reaction is one that:

A piece of aluminum with a mass of 55.0 g has an initial temperature of 95.0°C. The aluminum is immersed in a beaker containing an unknown mass of water at 21.0°C. When they reach thermal equilibrium, the final temperature is 28.5°C. What is the mass of the water, g? (Specific heat of Al = 0.903 J/g·°C; Specific heat of H2O = 4.184 J/g·°C)

Give the number of valence electrons for HSO4-.

A fixed amount of gas at 25.0°C occupies a volume of 10.0 L when the pressure is 629 torr. Use Charles’s law to calculate the volume (L) the gas will occupy when the temperature is increased to 126oC while maintaining the pressure at 629 torrs.

How many moles are in 1.77 kg of cuprous sulfate (Cu2SO4)? Molar mass Cu2SO4  223.2 g/mol; 1 kg =1000g

Identify the total number of bonding pairs and lone pairs of electrons in H2O2.

How many lone electron pairs does the CN- cyanide polyatomic anion have?

What is the predicted ionic charge for the metal in Group 2 (IIA )?     

How much heat in kJ is produced by the combustion of 92.0 g of methanol (CH₄O)? 2CH₄O(g) + 3O₂(g) → 2CO₂(g) + 4H₂O(g); ΔH°rxn = −726.0 kJ/mol The molar mass of methanol is 32.04 g/mol