Element X reacts with chlorine to form a compound with the formula of X2Cl3. This compound contains 25% by mass of chlorine. What is the relative atomic mass of the element X?(Relative atomic mass: Cl = 35.5) A. 39.9 B. 79.9 C. 106.5 D. 159.8 20.7 g of lead metal reacts with excess oxygen to form lead(II) oxide on strong heating. What is the mass of lead(II) oxide formed? (Relative atomic masses: O = 16.0, Pb = 207.2)
18. Element X reacts with chlorine to form a compound with the formula of X2Cl3. This compound contains 25% by mass of chlorine. What is the relative
A. 39.9 B. 79.9 C. 106.5 D. 159.8
20.7 g of lead metal reacts with excess oxygen to form lead(II) oxide on strong heating. What is the mass of lead(II) oxide formed?
(Relative atomic masses: O = 16.0, Pb = 207.2)
11.1 g, 22.3 g, 33.4 g, 44.6g
20. Phosphorus reacts with iodine to produce phosphorus(III) iodide:
22.3 g 33.4 g 44.6 g
P4 + 6I2 → 4PI3
What is the minimum mass of iodine required to produce 1 g of phosphorus(III) iodide when the phosphorus is in excess?
((Relative atomic mass: I = 126.9; molar mass of phosphorus(III) iodide = 411.7 g)
A. 0.462 g B. 0.925 g C. 2.466 g D. 3.700 g
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