Question 1

The the SI unit to express the amount of a substance is called?

Accepted Answer

freetext://mole

Question 2

One mole is equivalent to 6.02x10^24

Accepted Answer

boolean://false

Question 3

Find the molar mass of water?

Accepted Answer

freetextm://18.02g/mol: 18.02

Answer

freetextm://58.44g/mol: 58.44

Question 4

Find the molar mass of carbon dioxide?

Accepted Answer

freetextm://44.01g/mol: 44.01

Question 5

Find the molar of sodium chloride NaCl.

Accepted Answer

freetextm://58.44g/mol: 58.44

Question 6

Find the molar molar mass of calcium carbonate CaCO_{3 ,}if the atomic mass of Ca- 40.08g/mol, C- 12.01g/mol and O- 16.00g/mol.

Accepted Answer

freetextm://100.09g/mol: 100.09

Question 7

Find the molar mass of copper sulphate CuSO_4.

Accepted Answer

freetextm://159.62g/mol: 159.62

Question 8

Find the molar mass of sodium hydroxide NaOH.

Accepted Answer

freetextm://40g/mol: 40

Question 9

Find the molar mass of ammonia NH_3.

Accepted Answer

freetextm://17.04g/mol: 17.04

Question 10

It is the percent by mass of each in a compound.

Accepted Answer

freetext://percentage composition

Question 11

How many moles are present in150.10g carbon dioxide (CO₂) with a molar mass of 44.01g/mol?

Accepted Answer

freetextm://3.41 moles: 3.41

Question 12

How many molecules are present in150.10g carbon dioxide (CO₂) with a molar mass of 44.01g/mol?

Accepted Answer

freetextm://2.05x10²⁴: 2.05x10²⁴particles/mol: 2.05x10²⁴particles/mole: 2.05x10^24: 2.05x10^24particles/mol:2.05x10^24particles/mol

Question 13

Calculate the percentage composition of hydrogen in ammonium nitrate NH₄NO₄.

Accepted Answer

freetextm://35%: 35

Question 14

Calculate the percentage composition of oxygen in ammonium nitrate NH₄NO₄.

Accepted Answer

freetextm://59.96%: 59.96

Question 15

Calculate the percentage composition of sulfur in ammonium sulfate - (NH₄)₂SO_4.

Accepted Answer

freetextm://24.26%: 24.26

Question 16

Calculate the percentage composition of nitrogen in ammonium sulfate - (NH₄)₂SO_4.

Accepted Answer

freetextm:// 21.20%: 21.20

Question 17

Calculate the percentage composition of nitrogen in ammonia NH_3.

Accepted Answer

freetextm://82.22%: 82.22

Question 18

Calculate the percentage composition of hydrogen in ammonia NH_3.

Accepted Answer

freetextm://17.78%: 17.78

Question 19

Calculate the percentage composition of sodium in sodium chloride NaCl.

Accepted Answer

freetextm://39.33%: 39.33

Question 20

Calculate the percentage composition of chlorine in sodium chloride NaCl.

Accepted Answer

freetextm://40.66%: 40.66

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