Show You Know It: Mole Relationships

How many moles of alanine, C3H7NO2, are there in 159g of alanine? Alanine's molar mass is 89.1g/mol

022 x 1023 for Avogadro's number

Number

• Molar Mass

Mes

Is this statement true or false? Lemonade crystals added to hot water will dissolve faster than when added to cold water. true false

How can you tell isotopes of the same element apart?

How much energy is released when 37.8 g of water freezes? the heat of fusion for water is 6.02 kj/mol. the amount of heat energy released = kj?

The first two quantum numbers for the LAST "p" electron in the atom Br" are: 1) 4,3 2) 4,1 3) 3,1 4) 3,2 5) 4,2

If a hydrogen ion is formed from a water molecule, what other ion is also formed?

A silver coin rubs vigorously against a wool cloth. becomes positively charged. Which statements are true? The silver coin lost electrons. The silver coin gained electrons. The wool cloth lost electrons. The wool cloth gained protons.

C2H4 + O2 → 2C + 2H2O Mg + H2O → MgO + H2 N2 + 2O2 → 2NO2 S + O2 → S + H2O Which of the following is a valid combustion reaction?

In general, why would a thermometer increase in temperature? What happens with the energy involved?

What is the kinetic energy of the emitted electrons when cesium is exposed to UV rays of frequency 1.6*1015Hz?

For the reaction H2SO4 + 2Na2OH4 - > Na2SO4 + 2H2O If you want to make 5 moles of Na2SO4, how many miles of H2SO4 do you need? A) 5 B) 10 C) 12 D) 2