1) Which of the following represent a balanced equation? Pb(NO 3 ) 2 + Na 2 CO 3

Question

1)Which of the following represent a balanced equation?

Pb(NO3)2 + Na2CO3   --> PbCO3   + NaNO3

How many grams of SO2 can be produced in 500.4 g of S8 are combusted in an excess of O2? S8 + O2 SO2 (not balanced)

Krypton has an atomic mass of 83.80amu which is equal to:

Chuck Norris's favorite element is the element of Surprise, Sp. It has three isotopes with the following masses and abundance: 34 amu (75%), 33 amu (20%) and 37 amu (5%). What is the average atomic mass?

Explanation / Answer

1) 2C2H6 + 7O2 ? 4CO2 + 6H2O

2) Pb(NO3)2 + Na2CO3   --> 2PbCO3   + 2 NaNO3

10)

average atomic mass = 0.75*34 + 0.2*33 + 0.05*37 = 33.95 amu

9)

molar mass of Manganese (V) Nitrate = 54.93 + 5*62 = 364.93 amu

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