Homework Help for Chemistry

The heat of vaporization of water at 1000C is 2.26 kJ/g; at 370C it is 2.41kJ/g.

2.) The reaction of calcium hydride with water can be used to prepare hydrogen gas:

CaH2 (s) + 2 H2O (l) à Ca(OH)2 (aq) + 2 H2 (g)

              How many moles of Hydrogen gas can be manufactured from 1.0x106 mol CaH2?

How many mililiters of a solution of 3% w/v, 4% w/v and 7% w/v should be used to prepare 4 pint of a 5 % w/v solution.

What is the percentage strength of chloroform in a mixture of 200ml of a solution containing 35% v/v , 250 ml of another solution containing 21% v/v chloroform, in addition to sufficient quantity of water to complete the volume into 1000 ml

What is the percentage strength of chloroform in a mixture of 200ml of a solution containing 35% v/v , 250 ml of another solution containing 21% v/v chloroform, in addition to sufficient quantity of water to complete the volume into 1000 ml

A solution containing a metal ion (M3+(aq))(M3+(aq)) is electrolyzed by a current of 5.0 A5.0 A. After 10.010.0 minutes, 1.19 g1.19 g of the metal is plated out.

(a) How many coulombs are supplied by the battery?

(b) What is the metal?

The pediatrician wants the child-patient to take 200 mg of amoxicillin per teaspoonful dose.

•The label for amoxicillin powder for oral suspension indicates that the addition of 68 mL of purified water will result in a final volume of 100 mL with a concentration of 250 mg amoxicillin per 5 mL of suspension.

•How many milliliters of water should the pharmacist add to the amoxicillin powder to produce a concentration of 200 mg/teaspoonful?

1. After constitution of a dry powder, (each5 mLof ampicillin for oral suspension contains 250 mg of ampicillin )in package sizes to prepare 100 mL, 150 mL, or 200 mL of suspension.
2. ** Which package size should be dispensed for a 20-kg child.  who is to take 50 mg/kg/day total, q.i.d. in equally divided and spaced doses 10 days?

A sample containing 0.2784 grams of sodium chloride (NaCl) and 0.5486 grams of magnesium chloride
(MgCl2). The chloride in the sample was precipitated by the addition of 47.8 mL of a silver nitrate solution.
What is the concentration of the silver nitrate solution?

7. What does it mean if an atom is part of the "3p-block"?

6. Write the shorthand configuration for .

5. Write the shorthand configuration for iron. 

4. What is the final configuration term for element 118, Oganesson, Og?