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Calculate the number of grams of CO produced when13.0 g of C (carbon) reacts completely in the following reaction? Atomic weights of C = 12.0, O = 16.0                                     2  Ca3(PO4)2  +  6 SiO2   +   10 C     —–>   P4   +  6  CaSiO3   +  10 CO    

The empirical formula of a compound is CH.  If the molar mass of this compound is 78.0 g, then the molecular formula is (Note: all the numbers in the answers are subscripts)

A gas with an initial temperature of 418 K and pressure of 10.0 atm,  is heated to a temperature of 855 K, what is the new pressure?      

What is the major intermolecular forces between H of H2O molecule with N (nitrogen) of another molecule of NH3?  

Both gas and liquid share the following property: indefinite volume definite shape and volume   c. definite shape   d. definite shape and indefinite volume   e. no correct answer given

What is the bond angle of a molecule with 2 double bonds around the central atom?

Which gas law involved moles of the gas?

The following elements with the smallest electronegativity is

Complete the following matching pair questions.  You need to draw the Lewis structures on a piece of paper for all the possible formulas before selecting the answers.  No need to send me the paper! Note:  All the numbers in the formulas are subscripts.

What is the mole of 2.50 L oxygen at 325oC and 83.2 atm?  The gas constant is 0.0821 L atm/ K mol.         (a)  0.128 mol               (b) 4.24 mol              (c)  0.236 mol               (d)  42.4 mol            (e)  7.80 mol