2) Which statement about the following chemical reaction is not correct? A) For

Question

2) Which statement about the following chemical reaction is not correct? A) For every mole of nitrogen gas consumed, two moles of ammonia gas are produced B) For every two moles of nitrogen gas consumed, three moles of ammonia are produced C) For every three moles of hydrogen gas consumed, two moles of ammonia are produced D) For every two moles of ammonia produced, three moles of hydrogen gas are consumed E) One mole of nitrogen gas reacts with three moles of hydrogen gas 3) How many oxygen atoms are in 12.3 g of potassium sulfate? 4) What is the correct formula for Irom (IID phosphate? A certain metal oxide is composed of manganese and oxygen. Determine the empirical formula of the compound if the manganese has an oxygen content of 36.81% by mass and a manganese content of 63.19 %. 5)

Explanation / Answer

Q2

a)

correct, since ratio is 1:2

b)

false, ratio is 1:2

c)

true, since 1:3 ratio

d)

true, as stated in c

e)

true, since ratio is 1:3

Q3

K2SO4

mol = mass/MW = 12.3/174.2592 = 0.07058 mol of K2SO4

1 mol of K2SO4 = 4 mol of O

0.07058 mol - 4*0.07058 = 0.28232 mol of O

1 mol = 6.022*10^23 atoms

0.28232mol = (0.28232)(6.022*10^23) = 1.70*10^23 atoms of oxygen

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