Module 7 On Your Own

How many moles of scandium atoms are in a 50.0gram sample of scandium?

1.11 moles

How many moles of glucose (C6 H12 O6) are ub a 2.50kg sample?

13.9 moles

A chemist obtains a 100.0 moles of ammonia, NH3. If he allows this sample to decompose, how many moles of hydrogen gas will be produced?1

150.0 moles

Write the Chemical Equation for the Decomposition of C12 H23 O11

2 NCl↓3 → N↓2 + 3 Cl↓2

Write the Chemical Equation for the Decomposition of Nitrogen Trichloride.

2 [C12 H23 O11] → 2 [12C + 23/2 H2 + 11/2 O2] 2C12 H23 O11 → 24 + 23H2 + 11O2

What is the mass of a sodium sulfate molecule in g? 1.00amu = 1.66x10^-24g

2.36x10^-22g

What is the mass of a nitrogen trioxide sample if it contains 0.46moles?

29 grams

What is the mass of a sample that contains 5.5x10^23 atoms of sulfur, given that 1 mole=6.02x10^23 atoms?

29 grams

Write a Balanced Chemical Equation for the formation of KClO ↓3

2K + Cl2 + 3O2 → 2KClO3

Write a Balanced Chemical Equation for the complete combustion of propionaldehyde (C3H6O)

C3H6O + 4O2 → 3CO2 + 3H2O

What is the mass of one lithium atom in kg? (1.00 amu = 1.66 x 10^-24 g)

Lithium atoms have a mass of 6.94 amu 6.94amu/1 x 1.66x10^-24g/1.00amu x 1kg/1,000g = 1.15x10^-26 kg