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The formula mass is calculated by adding up all the atomic masses for every atom in the formula. Note: The atomic mass of an atom is the atom's mass relative to 1/12th of the mass of a carbon-12 atom on which the standard atomic mass scale is based (e.g. H = 1, C = 12, P = 31 etc).
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(b) Find (i) the empirical formula and (ii) the molecular formula of a compound containing 4.04% hydrogen, 24.24% carbon and 71.72% chlorine, given the following information: relative atomic masses: H=1, C=12, Cl=35.5 relative molecular mass of the compound = 99 (i)
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Calculate the relative formula masses for calcium chloride, C a C l 2 ... Atomic mass of chlorine (2) = 3 5. 5 × 2 = 7 1. Formula unit mass of C a C l 2 ...
produce calcium phosphate and water. (1) (c) Calcium dihydrogenphosphate can be represented by the formula Ca(H 2 PO 4) x where x is an integer. A 9.76 g sample of calcium dihydrogenphosphate contains 0.17 g of hydrogen, 2.59 g of phosphorus and 5.33 g of oxygen. Calculate the empirical formula and hence the value of x. Show your working. (4)
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The relative formula mass, M r, of calcium nitrate, Ca(NO 3) 2 ... 2–(aq) by adding acidifiedaqueous barium chloride or acidified aqueous barium nitrate. (i) ...
(c) €€€€Zinc chloride can also be prepared in the laboratory by the reaction between zinc and hydrogen chloride gas. Zn + 2HCl € ZnCl2 + H2 An impure sample of zinc powder with a mass of 5.68 g was reacted with hydrogen chloride gas until the reaction was complete. The zinc chloride produced had a mass of 10.7 g.
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(ii) aluminium chloride (iii) sodium sulphide (iv) magnesium hydroxide. Solution: (i) Formula of sodium oxide (made of sodium Na and oxygen O): Thus, the formula of sodium oxide is Na. 2. O. (ii) Formula of aluminium chloride (made of aluminium Al and chlorine Cl):
A relative formula mass (or M r for short) tells us the total mass of all the particles found in each formula of a substance. To be able to calculate the M r we need to know the mass of the individual particles, which is called the relative atomic mass (or A r for short). The A r of each atom can be found using the periodic table.
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Find my revision workbooks here: https://www.freesciencelessons.co.uk/workbooksIn this video, we take a look at a really important topic in Chemistry which i... (b) Calcium carbonate reacts with nitric acid to produce calcium nitrate. Calculate the relative formula mass (M r) of calcium nitrate, Ca(NO 3) 2 Relative atomic masses (A r): N = 14; O = 16; Ca = 40 _____ _____ Relative formula mass (M r) = _____ (2) (c) Zinc carbonate decomposes when heated. A student heated 25 g zinc carbonate (ZnCO 3).
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Calcium carbonate in water with a fixed partial pressure of carbon dioxide. For the case of a fixed partial pressure of carbon dioxide and calcium carbonate dissolved in the aqueous phase one more equation is need to describe the system. This is the solubility product of calcium carbonate: = K ( CaCO ) ( Ca ) ( CO ) o CaCO 3 2 - 3 2 + 3 (19)
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The relative atomic mass of an element, symbol A r, is the relative mass of its atoms compared to the mass of a carbon-12 atom. The A r values for elements are given in the periodic table.
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Example: Calculate the solubility product constant for lead(II) chloride, if 50.0 mL of a saturated solution of lead(II) chloride was found to contain 0.2207 g of lead(II) chloride dissolved in it. First, write the equation for the dissolving of lead(II) chloride and the equilibrium expression for the dissolving process.
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