WorksheetsIntroduction to Chemistry Quiz
Total questions: 38
Worksheet time: 1hrs 29mins
What is the molar mass of H2SO4? (H:1, S:32, O:16)
What is the volume of 0.1 mol of H2 gas at STP?
What is the molar mass of Al2(SO4)3? (Al:27, S:32, O;16)
What is the number of moles of 3.01 ⋅ 10^22 atoms of helium (He)?
How many moles are there in 11g CO2 gas? (C:12, O:16)
How many grams are there in 2.5 moles of NaOH? (Na:23, O:16, H:16)
112 L Cl2 as is given at STP. What is the number of moles of this gas?
In a special container two moles of O2 as is found at STP. How many liter volume does it occupies?
How many moles S and O exist in 32 g SO2? (S:32, O:10)
Find the density of carbondioxide (CO2) at STP.
Find the mass percentages of each element in NaOH. (Na:23, O:16, H:1)
What is the empirical formula of 26.6 g nitrogen oxide (NO) that contains 9.8 gram nitrogen? (N:14, O:16)
A compound of C, H, and O is composed of 40 % carbon, 6.66 % hydrogen and 53.28 % oxygen all by mass. What is the empirical formula of this compound? (C:12, H:1, O:16)
Lactic acid is a compound (containing C-H-O) and has a molar mass of 90 gr. 25.2g of lactic acid contains 10.08 g of carbon and 13.44 g of oxygen. What is the molecular formula of the lactic acid? (C:12, H:1, O:16)
Why do we need Avogadro’s number in chemistry?
Compare 6.02 ⋅10^23 and the population of earth that is abouth 6 billions. How many planet’s population like earth are equal to 6.02 ⋅10^23?
How atomic mass unit (amu) would be converted in to gram (g)?
Find molar mass of the following compounds below (Look periodic table for the atomic mass of elements). a) CaO f) Na2Cr2O7 b) AlCl3 g) H2SO4 c) NO2 h) (NH4)2SO4 d) Ca(OH)2 i) H2SO4 e) NH4NO3 j) SO3
Find the mass of following substances. a) 5 mol of H2O b) 20 mol of C2H6 c) 0.75 mol of H2SO4
Calculate how many atoms are there in each substance given below. a) 10 g of Ca b) 44.8 L of O2 at STP c) 50 g of CaCO3
Answer the following questions about 16 grams of SO3 gas. a) How many moles does it have? b) How many liters volume does it occupy? c) How many molecules of SO3 does it contain? d) How many atoms of S is found in it? e) How many grams of S does it contain?
Answer the following questions for 0.05 moles of H2S? a) How many grams is it? b) How many grams of hydrogen does it contain? c) How many grams of sulfur does it contain? d) How many molecules is it?
Find the percentage of nitrogen in the following compound by mass? a) NH3 d) NaCN b) HNO3 e) N2O5 c) NH4NO3 f) N2O5
Calculate the percent composition of each element in following compounds by mass. a) MgO b) CaCO3 c) NH2 d) H2SO4
At STP 5.6 L XO2 gas has 11 g mass. Find the molar mass of X.
Find the empirical formula of following compounds. a) Compound 60 % Mg and 40 % O (Mg:24, O:16) b) Compound 30 % O and 70 % Fe (O:16, Fe:26) c) Compound 50 % Cu and 50 % S (Cu:64, S:32)
0.5 mol of a compound containing Ca, C and O atoms is 50 g. If this compound contains 40 % of Ca, 12 % of calcium and 48 % of oxygen, what is its molecular formula?
A 11.2 L mixture of the He and O2 gases weighs 6.2 g at STP. What is the percentage by mol of O2 gas in the mixture?
Which one of the following is not true for 6.02 ⋅10^23? A) It is called Avogadro’s number. B) It is abbreviated as NA. C) 1 mol of any substance contain that amount particle. D) It is not very big number. E) It is a well known number for chemists.
It is called Avogadro’s number.
It is abbreviated as NA.
1 mol of any substance contain that amount particle.
It is not very big number.
It is a well known number for chemists.
Which of the given elements or compounds has 1 mol atom? A) 1.204 ⋅10^22 O2 oxygen molecule B) 1.204 ⋅10^22 CO2 molecule C) 1.204 ⋅10^23 HNO3 molecule D) 1.204 ⋅10^24 H2O molecule E) 1.204 ⋅10^25 H2 molecule
1.204 ⋅10^22 O2 oxygen molecule
1.204 ⋅10^22 CO2 molecule
1.204 ⋅10^23 HNO3 molecule
1.204 ⋅10^24 H2O molecule
1.204 ⋅10^25 H2 molecule
How many moles of atoms are there in 0.5 moles P4O10? A) 3 B) 4 C) 5 D) 6 E) 7
3
4
5
6
7
What is the volume of 1.204 ⋅10^22 CO2 molecules, in mL at STP? A) 0.448 B) 4.48 C) 44.8 D) 448 E) 4488
0.448
4.48
44.8
448
4488
Which one of the following compounds has the highest mass? (H:1, C:12, O:16) A) 4 mol of H2 B) 0.2 mol of CO2 C) 6.2 ⋅10^24 H2O molecule D) 2.24 L C4H10 gas at STP. E) 10 g CO2
4 mol of H2
0.2 mol of CO2
6.2 ⋅10^24 H2O molecule
2.24 L C4H10 gas at STP.
10 g CO2
What is the mass of a water (H2O) molecule in gram? (NA≅6 ⋅10^23) A) 6⋅10–22 B) 3⋅10–23 C) 6⋅10–23 D) 3⋅10–24 E) 6⋅10–24
6⋅10–22
3⋅10–23
6⋅10–23
3⋅10–24
6⋅10–24
What is the formula of sulfur oxide that contains 40 % S and 60 % oxygen? (O:16, S:32) A) SO B) SO2 C) S2O5 D) S2O3 E) SO3
SO
SO2
S2O5
S2O3
SO3
What is the ratio of density of O2 gas to density air? (1 mol of air approximately 29 g/mol at STP) A) 16/29 B) 32/29 C) 29/32 D) 32/1 E) 1/29
16/29
32/29
29/32
32/1
1/29
If 0.5 mol of CnH2n is 21 gram. What is the value of “n”? A) 1 B) 2 C) 3 D) 4 E) 5
1
2
3
4
5
Which one of 16 grams of the following compounds, has the largest volume at STP? A) O2 B) SO2 C) CO2 D) CH4 E) NO
O2
SO2
CO2
CH4
NO
