A researcher measured out 50.25 g of platinum (Pt) how many atoms of platinum does the researcher have? 

An OSPF router has three directly connected networks; 172.16.0.0/24, 172.16.1.0/24, and 172.16.2.0/24. Which OSPF network command would advertise only the 172.16.1.0 network to neighbors?  

Determine the correct symbol for the following elements: Silver is [1] Sodium is [2] Hydrogen is [3]

Using the conversion factors in the table below determine how many uky are in 31.9 sew?   11.6 uky = 1.00 flw 4.1 ant = 2.00 sew 3.55 ant = 2.60 flw

What is the energy of a photon with a wavelength of 594 nm? 

Based on the successive ionization energies of an unknown element in the table provided, how many valence electrons does the element have?  Successive Ionization energies Number of Electrons Removed Ionization Energies (kJ/mol)  1 600 2 1200 3 3000 4 12,000 5 13,000 6 14,500 7 15,600

Complete the following statements about the Lewis structure of KrF3-. The central atom is [CA]. There are [1] single bonds. There are [2] double bonds.  There are [3] lone pairs around the central atom. 

Which of the following molecules is non-polar? 

What is the volume of ammonia (NH3) produced when 0.214 g of nitrogen gas reacts with excess hydrogen gas at STP? 

At constant temperature a 139 mL sample of gas has a pressure of 1.10 atm. What is the volume if the pressure is increased to 3.19 atm?