Final answer:
Two moles of strontium hydrogen carbonate (Sr(HCO3)2) contain 2 moles of strontium, 4 moles of hydrogen, 4 moles of carbon, and 12 moles of oxygen.
Step-by-step explanation:
To determine how many moles of each element are in two moles of strontium hydrogen carbonate (Sr(HCO3)2), we must consider the formula of the compound. The subscript of each element within the formula indicates how many atoms of that element are in a single molecule of the compound. Strontium hydrogen carbonate is composed of one strontium atom, two hydrogen atoms, and three oxygen atoms bonded to each carbon (two carbon atoms total). These subscripts must be multiplied by the number of moles we are considering.
- Sr(HCO3)2 = 1 Sr + 2(H) + 2(C) + 6(O).
- For one mole of Sr(HCO3)2: 1 mole Sr, 2 moles H, 2 moles C, 6 moles O.
- For two moles of Sr(HCO3)2: Multiply each by 2.
Thus, two moles of Sr(HCO3)2 contain:
- 2 moles of Strontium (Sr)
- 4 moles of Hydrogen (H)
- 4 moles of Carbon (C)
- 12 moles of Oxygen (O)