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I need help with a chemistry problem.?

Chemistry: these mammals can descend to depths of nearly 3000 m what is the depth in kilometers?

Is CO2 organic or inorganic molecule ? Why ?

Using the combined gas law, calculate the the volume, in mL, at STP of a gas that has a volume of 150.0 mL at 1.20 atm and 293 K.?

How many moles of pure Na2CO3 were there in the sample?

What was the percent of pure Na2CO3 in the sample?

Give à chemical name à monatomic gas?

What is the mass of O2(g) consumed in the combustion of 21.5 g cyclohexane, C6H12 to form CO2(g) and H2O(g)?

For the diprotic weak acid H2A, Ka1 = 2.9 × 10-6 and Ka2 = 7.9 × 10-9. What is the pH of a 0.0750 M solution of H2A?

If 5.0 moles of ammonia is produced then the number of hydrogen molecules consumed is? N2+3H2--->2NH3?

In a voltaic cell can hydrogen be the electrode at the cathode or anode?

What is the final concentration of 18.1 mL iron(III) chloride sol with an intl conc of 1.89M which is diluted with 15.7mL of solvent?

Make F the subject. C=5 (F-32)/9 give answer in form aC+b/c where a,b,c are all positive integers.help?

What is the molar mass, in g mol^1, of MgSO4x7H2O (please explain steps)?

what is functional group of carboxylic acid?

Calculate the pH of a 6.00×10-1 M aqueous solution of ammonium chloride (NH4Cl). (For ammonia, NH3, Kb = 1.80×10-5.)?

How many moles are equal to 93.75g of Sodium Sulfate (Na2SO4)?

Chemistry question?

When Na3PO4 and Ca(NO3)2 are combined, the following reaction occurs: 2PO4 + 3Ca -> Ca3(PO4)2?

What is the mass of one mole of atoms in these 3 compounds?

Products and net ionic equation for the reaction : Al(NO3)3 + NH3 + H2O -->?

Quick Chemistry question please help.?

If 990. mL of water is added to 10.0 mL of 0.10 M HCl, what is the pH of the resultant solution?

Using average bond enthalpies (linked above), estimate the enthalpy change for the following reaction: 4NH3(g) + 5O2(g)4NO(g) + 6H2O(g)?

Using average bond enthalpies (linked above), estimate the enthalpy change for the following reaction: H2(g) + F2(g)2HF(g)?

Math needs at once?

Initial rate of the reaction PCl5-->PCl3 + Cl2 is increased by a factor of 4 when concentration of PCl5 is doubled, therefore the rate is?

Give five ways of increasing the rate of the following reaction: H2(g)+Br2(g) -> 2HBr(g)?

What mass of potassium chloride forms when 5.11 L of chlorine gas at 0.943 atm and 286 K reacts with 29.0 g potassium?

How many ml of 1.00M HCl do I need to add to 10.0ml of 1.00M NaOH to get a solution with pH = 1?

The indium (II) ion and indium (III) ion?

Chemistry heat change?

Calculate the heat change in calories for condensation of 18.0 g of steam at 100∘C.?

Assign oxidation numbers to, 3Mg(s) + N2(g) = Mg3N2(s)?

Please solve ques no 3?

Geometry help please! Thank you!?

Chemistry help?

Hard titration chemistry questions. Please help!?

Help with physics thanks?

If a 1.0L flask is filled with 450 torr of SiH4 gas at 20 °C, what is the mass of SiH4 in the flask?

CHEM HELP?

For the reaction, calculate how many grams of the product form when 3.4 g of Cl2completely reacts.?

what volume in liters of h2 gas is produced at 1.25 atm and 58 c when 85 grams of CaH2 are reacted with 100 grams h2o?

the H+ Concentration in a 1.0 molar solution of HCN IS 2X10 -5 Oles/dm3.what is the value for Ka for HCN?

Balance these reactions and please show how you did it: c) NO + H2 → NH3 + H2O (d) H2 + O2 → H2O (e) Al + O2 → Al2O3?

A water sample is suspected to be contaminated by PO4 ions. How could you know if the sample is really contaminated?

Chem help equations?

If you add aqueous ammonia to AgCl+NaNO3 What is the balanced equation?

Ionization potential decreses ftom Li to Cs?

the probability that in a family of 3 children, there will be at least one boy, is (a) 1/7 (b) 1/8, (c) 3/8 (d) 7/8?