A Big Mac hamburger contains 5.50 times 10^5 calories. How many kilojoules does

Question

A Big Mac hamburger contains 5.50 times 10^5 calories. How many kilojoules does a Big Mac contain? (1 cal = 4.184 J) How many atoms in the 60.0g of AgCl? Balance the following equation using proper coefficients. According to the balanced chemical equation in if 150g of H_2O reacted with 15.00g of Beryllium, which is the limiting reagent in this reaction, Be or H_2O? Justify your answer with calculations. Calculate the theoretical yield of Be(OH)_2 in b). An analysis of the compound gives the following composition by mass: H: 2.1%, O: 65.3% and 32.6% S Calculate its empirical formula.

Explanation / Answer

IV)
Energy,
E = 5.50*10^5 cal
= 5.50*10^5 cal*4.184 J/cal
= 2.30*10^6 J
= 2.30*10^3 KJ
Answer: 2.30*10^3 KJ

V)
mol of AgCl = mass of AgCl/molar mass of AgCl
= 60.0 g/ 143.3 g/mol
=0.4187 mol

1 mol of AgCl has 2 mol of atom
so,
number of mol of atom = 2*0.4187 = 0.8374 mol

number of atom = 0.8374 mol * 6.022*10^23 atom/mol
= 5.04*10^23 atoms

Answer: 5.04*10^23 atoms

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