Chemistry

How to calculate relative molecular mass

One molecule of compound P contains four nickel atoms.If 1.00g of P contain 0.079g of nickel,what is the relative molecular mass of P?-mass of Ni = .079g = .079 / 58.7 = 0.001345 moles 4 of these are

Calculating the molality

Calculate the molality (in mol kg-1) of C2H5OH in a water solution that is prepared by mixing 29.73 mL of C2H5OH with 524.9 mL of H2O at 20°C. The density of C2H5OH at 20°C is 0.789 g/mL. Any help is

Why is chem so hard? Please help

So I am a jr and I take chem it is so hard to me. I mean every test I took I failed and I got a 70 in it. I use to be good in sci I got 95 in earth sci and 98 in bio. Why is chem so hard? Is there any

Given that a litre is a cubic decimetre, and cc is short for cubic centimetre, show a cc is also a millilitre

please show me how a cubic centimetre is also is also a millilitre with he working out...-1L== 1cubic decimetre 1000ml= 1 cubic decimeter since 1 L= 1000ml 1000ml=1000cc since 1 cubic decimtre = 1000

1 Question Science Help. Chemistry

Hydrogen Peroxide is in a test tube. Then put some manganese (IV) oxide in(Acting as a catalyst not a reactant). Write a word equation and provide a balanced equation.-It forms water (H2O) and oxygen

Chemistry people please please please help me!!

Based on position in the periodic table and electron configuration, arrange these elements in order of decreasing E11. Rank the elements from highest to lowest ionization energy. To rank items as equi

In an experiment, 0.767g Cr reacts completely with 0.708 g O2 to form a single solid compound. Write a balance

Cr (s) + O2 (g) => CrO2(s)

PH of buffer solution, question for good chemists!

What is the pH of a buffer solution prepared by dissolving 23 g CH 3COONa in a sufficient volume of 0.76 M CH 3COOH to make 0.9 L of the buffer?( K a (CH 3COOH) = 1.800 x 10 -5). This one is tough,

Percent abundance of copper isotopes

Copper has an atomic mass of 63.5 amu with 2 isotopes Cu-63 and Cu-65. How do I calculate the percent abundance of each isotope?-http://www.chemteam.info/Mole/AvgAtomicW… Example #2 uses copper.

Working out number of electrons

How many electrons are transferred in the following reaction? 2ClO3- + 12H+ + 10I- → 5I2 + Cl2 + 6H2O Thanks for help. K-you an dothis one pretty simply by looking at the I- There are 10 I-, each o

Question about scientific notation

How do I write the number 2318979. in scientific notation? Include an explanation? Thanks!-When writing in scientific notation, numbers can only range from 1 to 9. Meaning you have to place your dec

Electron flow question, can anybody solve

For the cell described below, which of the following is true? Zn(s)|Zn2+(aq)||Cr3+(aq)|Cr(s) A.The electrons flow from the cathode to the anode.B.The zinc is reduced.C.The electrons flow from the zin

Cell potential question, smart chemist needed!

You make a cell with a nickel electrode in a solution of nickel nitrate and a zinc electrode in a solution of zinc nitrate. If you could increase the concentration of Zn 2+, which of the following is

Calculating the molar fraction

42 g of methanol (CH3OH) was dissolved in 111.9 g of water. Calculate the molar fraction of methanol in the resulting solution. This is a bit confusing, can anybody solve?-First, you need to calculat

Question de chimie?.

NO2 (nitrite) - compose ionique ou convalent?-convalent