a.
The compound is written as
. Since cations are always written before anions in ionic compound,
is the cation and
is the anion.
b.
The name of the anion is manganate (VII) ion or also known as permanganate ion.
c.
The charge of the anion
is -1 as evident by the single negative charge on
it.
d.
Since the anion has -1 charge, the cation will have +1 charge. Group I elements ( Alkali Metals: Li, Na, K, Rb, Cs, Fr) usually form stable +1 charge cations. Hence, X is likely to be a group I cation.
e.
The mass of MnO4- ion can be calculated as follows:
Hence, the mass of MnO4 in 3 significant figures is 119 g/mol.
f.
It is given that X accounts for 25% of XMnO4.
Since MnO4 has a mass of 119 g/mol, the mass of X can be calculated as follows:
Hence, the mass of X in three significant figures is about 39.7 g/mol.
g.
The group I element with mass closest to 39.7 g/mol is K (Potassium) with a mass of 39.1 g/mol
Hence, the identity of X is K.
h.
Hence, the name of the compound
is potassium permanganate.
i.
Formula mass of the compound can be calculated as
Hence, the formula mass of the compound is 158 g/mol (rounded to 3 significant figures).
j.
Mass of compound taken = 50.5 g
Hence, number of moles can be calculated as
k.
Volume of water = 500.0 mL
50.5 g of the compound is dissolved into 500.0 mL water.
Assuming the volume of the solution do not change with addition of the compound, the volume of the solution is 50.5 g.
Hence, there are 0.320 mol of the compound in 500 mL = 0.500 L of solution.
Hence, the concentration in moles/L can be calculated as
A compound has the formula XMnO4. X accounts for roughly 25% of the mass of the...
Complete the table below for calculating the formula mass of the ionic compound chromium(II) bromide . Atomic Mass Number of ions Mass of Ions Ion Formula Cr2+ Br L Cation Anion amu amu X amu x = = amu amu formula mass chromium(II) bromide = U
A binary compound of oxygen and an unknown element, X, has the formula XO2 and is 72.71 mass % oxygen. (a) What is the atomic weight of element X? u (b) What is the symbol for the element on the periodic table? X = (c) Is the element X a metal or not? _________? (d) Is the compound XO2 likely to be ionic or covalent?_________ioniccovalent (e) What is the name of the compound?
Complete the table below for calculating the molar mass of the ionic compound iron(III) fluoride. Formula Molar mass of ion Number of ions Mass of ion in one mole of iron(III) fluoride Cation Fe3+ g/mol x mol Anion F g /mol mol - Molar mass iron(III) fluoride - g/mol
Zinc forms the cation, Zn2+. A mystery anion X is represented as X2. Given this information, what is the molecular formula of the salt it forms with zinc? (Chemical formula use subscript numbers, but for this question any required numbers may be formatted normally. Also, do not insert any spaces between the elements.) Answer: Library Home Students According to the VSEPR electron pairs in the valence energy level repel each other and are therefore arranged as far apart as possible....
What is the mass, in grams, of 1.30 molmol of water, H2OH2O?
Learning Goal: Be able to convert to mass from a given number of moles. Completing problems such as this is critical for ensuring your success in chemistry. If you would like to get a head start (and we strongly suggest you do if you want to do well in the course) we have provided you with help to learn this concept in the hints. Hints for this problem...
1. Determine the formula weight for each compound: sulfur tetrafluoride, carbon dioxide, sodium chloride, phosphorus pentafluoride, calcium phosphate, water, propane (C3H8), iron(III) sulfate. Which compounds would also have a molecular weight or molar mass? What is the difference between a formula weight and a molecular weight? 2. Determine the percent composition for each compound in question 1. Is it possible for two compounds to have the same percent composition? 3. For each compound in question 1, determine the number of...
help me solve please. im stumped
EMPIRICAL FORMULA OF MAGNESIUM OXIDE COMPOUND INDIVIDUAL DATA Mass of Empty Crucible (g) + lid 41.3549 47.4 Mass of the Magnesium (g) Mass of the Crucible with Contents After the Reaction (g) Mass of the Contents (Magnesium Oxide) Alone (g) 47.253941613 416959 4099 41 a 42.200 a 1.513 1o. 2719 10.1159 | 103 10.014 mol , 0168 ml 1.0169 10.017 mol 1.007 1.000644 Mass of the Oxygen in the Magnesium Oxide (g) Moles of...
A compound of X and Y is ½ X by mass. The atomic mass of element X is ¾ the atomic mass of element Y. What is the empirical formula? Please explain in detail.
Assume a 3.0 mass % aqueous solution of compound that has molar mass of 74.44. (Assume the density of water at this temperatue is 1.00 g/mL.) Part A What is the molality of the compound in this solution? Express your answer using two significant figures. IVO AQ R O 2 ? molality = Submit Request Answer Part B What is the mole fraction of this comound in the solution? Express your answer using two significant figures. VA¢ * N O...
What is the formula mass of sodium chloride (in units of g/mol)? Use two decimal places in atomic masses. Only give the numeric value of your answer. o Respond with the correct number of significant figures in scientific notation (Use E notation and only 1 digit before decimal e.g. 2.5e5 for 2.5 x 10") Type your response