Chemistry Answers

Calculate the number of moles of oxygen present in 2.0g of Na3PO4

a 17.50mL sample of a gas as at 4.500 atm. what will be the volume if the pressure becomes 1.500 atm, with a fixed amount of gas and temperature?

 How many grams of solute is present in 0.4 moles Magnesium hydroxide, Mg(OH)2 in 550 g water, H2O? The molar mass of Mg(OH)2 is 58 g/mol. 

Given: 

Solution:

 How many mL of 0.250 M HCl would react exactly with 30.0 mL of the 0.150 M solution of Ca(OH)2 solution? The chemical reaction involved is: HCl(aq) + NaOH(aq) → NaCl (aq) + H2O (l) 

Given: 

Solution:

 If 7.5 g of sodium nitrate, NaNO3 is dissolved in 85ml of H2O (density of H2O = 1.0g/ml), calculate the %(wt/wt) concentration of H2O in the solution. 

Given:

 Solution:

 A brand of rubbing alcohol says, it contains 70% (vol/vol) isopropyl alcohol. How many mL of isopropyl alcohol are there in 600 ml of the solution in the bottle? 

Given:

 Solution:

 The label of betadine skin cleanser says 7.5 % solution. Taking it to be % (wt/vol), how many grams of betadine (Providone-Iodine) are present in 50 mL bottle? 

Given:

 Solution:

 Calculate the mole fraction of sulfuric acid (H2SO4) in 8% (wt/wt) aqueous H2SO4 solution (molar masses: H2SO4 = 98 g/mol, H2O = 18 g/mol 

Given:

 Solution:

 Calculate the molar concentration of a solution that contains 23 g of potassium hydroxide. KOH in 250 ml of solution. Molar mass of KOH is 56 g/mol. 

Given: 

Solution:



Salt is often used to melt ice on roads during the winter amd the temperature right now is -4.500°C. How much NaCl would be necessary to melt 1000kg of rice by bringing down the freezing temperature to 4.500°C?

CH₃-CH₂-(CH₂)₃- CH₂- CH_{3 what is the common name of this}

What is the name of Al₂S₃?

. How many moles of O2 were needed for the combustion of the alcohol?

b. How many moles of H2O are formed for each mole of O2 consumed?

c. How many grammes of CO2 are produced for each mole of alcohol burned?

d. How many grammes of CO2 are produced for each gram of alcohol burned?

3. How many grams of ethanol, C6H12O is produced from 2000 grams of Glucose, C6H12O6?

how many grams p4 is formed for each mole of ca3(po4)2?

how many grammes of p4 is produced for each gram of ca3(po4)2 used?

how many moles sio2 is required for each mole of ca3(po4)2 used?

how many moles c is required for each mole of ca3(po4)2 used?

how many moles of p4 is formed for each mole of ca3(po4)2 used?