Chemistry Chapter 5 Test

What is the mass of a tin atom (Sn) in grams?

1.97 * 10^-22

Write a balanced chemical equation for the formation of NaHSO4.

2Na + H2 + 2S + 4O2 --> 2NaHSO4

Write the chemical equation for the decompostion of RbNO3.

2RbNO3 --> 2Rb+ N2+ 3O2

What is the mass of a K2CrO4 molecule in kg?

3.22 * 10^-25

What is the mass of a calcium atom in kg? (1.00 amu=1.66 * 10^-24g)

40.1 amu/1* 1.66*10^-24g/1.00 amu* 1 kg/1000g = 6.66* 10^-26 kg or 40.1 amu

Write the chemical equation for the decompostion of C12 H23 O11.

C12 H23 O11 --> C + H2 + O2 C12 H23 O11 --> 12C + H2 + O2 C12 H23 O11 --> 12C + 23/2H2 + O2 C12 H23 O11 --> 12C + 23/2H2 + 11/2O2 2*[C12 H23 O11]--> 24C + 23H2 + 11O2 2C12 H23 O11 --> 24C + 23H2 + 11O2

Write a balanced chemical equation for the complete cumbustion of propionaldehyde (C3H6O).

C3 H6 + 4O2 --> 3CO2 + 3H2O

An automoblie uses the energy gained from burning evaporated gasoline in order to run. Write a balanced chemical equation for the combustion C8 H18, the principal component of gasoline. Include phase symbols in your equation.

C8 H18 + O2 --> CO2 + H2O C8 H18 (g) + O2 (g) --> CO2 (g) + H2O (g) C8 H18 (g) + O2 (g) --> 8CO2 (g) + 9H2O (g) C8 H18 (g) + 25/2O2 (g) --> 8CO2 (g) + 9H2O (g) 2*[C8 H18 (g) + 25/2O2 (g)] --> 2*[8CO2 (g) + 9H2O (g)] 2C8 H18 (g) + 25O2 (g) --> 16CO2 (g) + 18H2O (g)

Write a balanced chemical equation for the formation of KHCO3.

K + H2 + C + O2 -->KHCO3 K + 1/2H2 + C + 3/2O2 -->KHCO3 2*[K + 1/2H2 + C + 3/2O2] --> 2*[KHCO3] 2K + H2 + 2C + 3O2 --> 2KHCO3

Writer the chemical equation for the decompostition of phosphorus trihydride.

PH3 --> P + H2 PH3 --> P + 3/2H2 2*[PH3]--> 2*[P+3/2H2] 2PH3 --> 2P + 3H2