Question

Question 1 .Solve all

a)How many moles of nitrogen, N, are in 90.0 g of nitrous oxide, N2

c)Calculate the number of moles of magnesium, chlorine, and oxygen atoms in 8.70 moles of magnesium perchlorate, Mg(ClO4)2.

d)A sample of propane, C3H8, contains 12.9 moles of carbon atoms. How many total moles of atoms does the sample contain?

e)Caffeine is a bitter stimulant drug and is found in varying quantities in seeds, leaves, and so on. Its formula is C8H10N4O2. Match the number of moles of each element found in the specified number of moles of caffeine.

Match the numbers in the left column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete before submitting your answer.

1.6

2.0

4.0

7.0

8.0

10

16

27

1. There are _mol of carbon in 2.0 mol of caffeine.

2. There are _ mol of hydrogen in 2.7 mol of caffeine.

3. There are _ mol of oxygen in 3.5 mol of caffeine.

4. There are _mol of nitrogen in 0.40 mol of caffeine.

f)

Sodium hydroxide, NaOH, is a strong base that is used in industrial synthesis and processes such as making paper.

What is the mass of 2.60 ×1022 molecules of NaOH (Molar mass = 40.0 g/mol)?Express the mass in grams to three significant figures.

Answer 1