Monday
July 28, 2014

Posts by annabel


Total # Posts: 19

math
Wayne will get $4200 if his salary is increase by 20%.Wayne's salary is 40% less the barry.Find Barry's salary.

math
Wayne will get $4200 if his salary is increase by 20%.Wayne's salary is 40% less the barry.Find Barry's salary.

Chemistry
if the yieeld for the following reaction is 85% how many grams of Al2S3 should be used to produce 165 g of Al(OH)3? Al2S3+6H2O-->2Al(OH)3+3H2S

Chemistry
a mixture of 4.00 moles of hydrogen and 3.00 moles of oxygen is ignited, forming water. what is the maximum amount of water in grams that can be formed?

Chemistry
A solution contains 1.50 g of dissolved Pb 2+ ions. How many grams of NaI must be added to the solution to completely precipitate all of the dissolved Pb 2+ as PbI2?

Chemistry
A 1.8 mole sample of a compound weighs 195 g and is found to be 11.18% H and 88.82% C. What is the molecular formula for the compound?

chemistry
sorry convert your 53 grams to kg. because your specific heat capacity is in J per kg this should change your answer

chemistry
q=m*c*change of t m=mass c= specific heat change of t= final temp- initial temp fill in these with your numbers and you should get the answer

Chemistry
A sample of iron ore contains 1.02 x 10^24 Fe atoms and is found to be 69.94% Fe by mass. What is the mass of the sample?

Chemistry
How many moles of O2 are needed for the complete combustion of 3 moles of CH4?

Chemistry
How many atoms are there in a 15.0-g sample of KBr?

Chemistry
How many atoms are there in a 15.0-g sample of KBr?

Writing
Complete the phrase: You give me love, You gave me life. You give me shelter, You gave me __________.

english
Harder to use because you have to make everything balance well, or it will throw it off.

english
I think they are harder because you don't have entire control over the string puppet, like wind can move it, and the strings can get tangled up.

Math-PLEASE check
PLEASE HELP!!!!!

Math
Anita says the plus sign + forms 2 pairs of vetical angles. Charles says it forms 2 pairs of congruent angles? Who is correct, and why? Wouldn't it be both, because there are 2 pairs of opposite angles with the same measure, and 4 congruent angles.

Chemistry
how do I work out the molecular mass of a substance such as oxide of arsenic? If I'm trying to work out the oxide part of this problem, where does hydrogen come into it? You have to know the mass, and how many moles. There are other methods. Hydrogen? Depends on the problem.

Chemistry
I need to work out the density of the gaseous oxide of arsenic at STP in g L-1 I realise density = mass/volume but my answer works out very high!! I have already worked out the volume to be 52cm^3 (Cubed). the mass to start with was 0.702g and at the end of the reaction was 0....

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