STOICHIOMETRY QUIZ Part II

1.If 100 cm3 of a hydrogen gas is added to 200 cm3 of a chlorine gas, forms hydrogen chloride gas (P,T). The volume of the product is ….
a.100 cm3
b.200 cm3
c.300 cm3
d.400 cm3
e.500 cm3
2.Two dm3 of CxHy gas burns in 5 dm3 oxygen gas. If there is 4 dm3 CO2(g), the chemical formula of CxHy is ….
a.C2H2
b.C2H4
c.C2H6
d.C3H3
e.C3H6
3.One dm3 of CxHy gas burns in 2 dm3 of an oxygen gas. If there is 1 dm3 of CO2(g), the chemical formula of CxHy is ….
a.CH4
b.C2H2
c.C2H4
d.C3H3
e.C3H6
4.Ethane gas, C2H6 is burned in air. The volume of ethane gas is 4,0 dm3. The volume of oxygen gas at the same P and T which needed in the burning is ….
a.3,5 dm3
b.7,0 dm3
c.10,5 dm3
d.14,0 dm3
e.28,0 dm3
5. Eight litters of hydrogen gas combines with x litters of chlorine gas to form eight litters of hydrogen chloride gas. The value of x is ….
a.2
b.4
c.6
d.8
e.10
6.Silver (Atomic mass 107.87) has two naturally-occurring isotopes with isotopic mass of 106.91 and 108.90. What is the percentage abundance of the heavier isotope?
a.47.24
b.51.82
c.48.16
d.49.05
e.50.95
7.The formula mass relative of copper(II) sulfate pentahydrate is …. (Ar Cu = 63,5; S = 32; O = 16; and H = 1)
a.159,5
b.249,5
c.255,5
d.313,0
e.403,0
8.The formula mass relative of barium hydroxide octahydrate is …. (Ar Ba = a; Ar O = b; and Ar H = c)
a.8 (a + 3b+ 4c)
b.(a + 2b + 2c) (16c + 8b)
c.(a + 2b + 2c) 8 (2c + b)
d.(a + 2b + 2c) + 8 (b + 2c)
e.(a + 2b + 2c) (2c + b)
9.Which of the following organic compounds has the lowest molecular mass? (ArC = 12, N = 14, H = 1).
a.C7H14
b.C6H10N2
c.C4H8N4
d.C7H11N
e.C5H11N3