Question

[1] The number of hydrogen ions in 4.9 g of tetraoxosulphate (VI) acid is [S = 32, NA = 6.02 x 1023 mol-1] 3.01 x 1022 6.02 x 1022 3.01 x 1023 6.02 x 1023 [2] How many atoms are present in 6.0 g of magnesium? [Mg = 12, NA = 6.02 x 1023 mol-1] 1.20 x 1022 2.41 x 1022 1.51 x 1023 3.01 x 1023 [3] How many moles of calcium trioxocarbonate (IV) are there in 2.5 g of the salt? [Ca = 40; O = 16; C = 12] 0.0025 0.025 0.25 2.5 [4] One mole of a compound MHCO3 has a mas of 84g. calculate the relative atomic mass of M. [H = 1; C = 12; O = 16] 61 42 26 23 [5] How many moles of iron (III) oxide are contained in 1 kg of the compound? [Fe = 56; O = 16] 3.125 0.3125 0.625 6.25 [6] What mass of SO2 contains the same number of molecules as 0.8 g of CH4? [CH4 = 16 g/mol; SO2 = 64 g/mol] 3.2 g 0.32 g 6.4 g 0.64 g [7] Consider the reaction represented by the equation below x KMn04 + y S02 + z H20 = K2S04 + 2MnS04 + 2H2S04 x, y and z are respectively 2, 5 and 2 2, 2 and 5 5, 1 and 2 1, 5 and 2 [8] The balancing of chemical equation is based on the law of Conservation of energy Conservation of mass Definite proportions Multiple proportions [9] A gaseous mixture contains 0.256g of hydrogen and 2.00g of oxygen. The mole ratio of hydrogen to oxygen in the mixture is 1:1 2:1 1:4 8:1 [10] Which of the following is the same as 24 g of Magnesium? [Mg = 24, H = 1, O = 16, Cl = 35.5] 1 g of hydrogen molecule 16 g of oxygen molecule 32 g of oxygen molecule 35.5 g of chlorine molecule

Answer 1

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