When a 45.0 g sample of an alloy at 100.0°C is dropped into 100.0 g of water at 25.0°C, the final temperature is 37.0°C.  What is the specific heat of the alloy?  The specific heat of H2O(l) is  4.184 J∙g–1∙°C–1. 

Anthracene is a polycyclic aromatic hydrocarbon that is a component of tar. Mass analysis reveals that it has the empirical formula C7H5. If the molar mass is 178.23 g/mol, which molecular formula is correct?

Which of the following best represents Avogadro’s number?

A compound was analyzed and found to contain 52.17% C, 13.13% H and 34.78% O. What is the empirical formula for the compound?

When is a noncommercial applicator license required?

Use the given heats of formation to calculate the standard enthalpy of reaction for the following reaction: 

Generally, when will new assignments become available?

What is the standard enthalpy of reaction for the reaction below? C4H4(g) + 2H2(g) –> C4H8(g) C4H4(g) + 5O2(g) –> 4CO2(g) + 2H2O(l)         -2341 KJ/mol H2(g) + O2(g)–> H2O(l)                                 -286 KJ/mol C4H8(g) + 6O2(g) –> 4CO2(g) + 4H2O(l)          -2755 KJ/mol  

Which statement regarding electrons is false?

Who is required to have an Incident Response Plan? Select all that apply.