Answers edited by Manish Bhardwaj
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Question #e484d

What is stoichiometry?

What is the concentration of lead ions and sulfide ions in a saturated solution of lead sulfide (#PbS#) solution at 25°C?

What is the formula for Magnesium Triiodine? I think it is Mg(I3)2 but wanting to confirm.

How do you mulitply #2 1/3 xx 5 2/4#?

How do you determine the length of each of the ribbons if Nadia takes a ribbon that is 48 inches long and cuts it in two pieces where one piece is three times as long as the other?

According to Avogadro's law, as the number of moles of gas increases, what happens to its volume?

Why are endothermic reactions useful?

How do you solve for t in #2/7(t+2/3)=1/5(t2/3)#?

Question #ada60

A 40.0 L tank of ammonia has a pressure of 8.00 atm. Calculate the volume of the ammonia if its pressure is changed to 12.0 atm while its temperature remains constant.

Question #162a7

How many grams of solid calcium hydroxide, Ca(OH)2, are required to react with 350 mL of 0.40 M HCl? __HCl + __Ca(OH)2 __CaCl2 + __H2O

Question #df3c0

If the reaction of 20.7 grams of CaCO3 produces 6.81 grams of CaO, what is the percent yield?
CaCO3=>CaO+CO2

What is the percent composition of a compound with the empirical formula #MgCl_2#?

How do you solve for a if #F=7 1/3# and #m=1/5# given Newton's second law states the #a=F/m# where a is the acceleration, F is the form, and m is the mass?

A gas occupies 11.2 liters at 0.860 atm. What is the pressure if the volume becomes 15.0 L?

Can you find the number of moles of Argon in 607 grams of Argon?

What is the mass of 5.99 mole of carbon monoxide?

Question #23843

How do you determine how far Doris can travel is Doris’s truck gets #10 \frac{2}{3}# miles per gallon and her tank has #5 \frac{1}{2}# gallons of gas?

How does solubility change with temperature for gases?

How many grams of Na2O are required to produce 1.60 x 102 grams of NaOH? Na2O + H2O > 2 NaOH

Question #25589

How can enthalpy change be determined for an aqueous solution?

How do you multiply #2/7 \cdot 3.5#?

What are some examples of compounds?

Question #f4231

Can someone explain how to do this?
Consider the following equation: 2ZnS(s) + 3O2(g) > 2ZnO(s) + 2SO2(g), ΔH° = –878.2 kJ.
What is the enthalpy change when 223.9 g ZnS(s) reacts in excess oxygen?

How do you find the quotient of #(4x^2 – y^2) ÷ (2x – y)#?

What is a neutral atom?

Question #1847d

How do you simplify #(x + 4)  2(x + 5)#?

How can I write the formula for strontium fluoride?

What mass of carbon dioxide is produced from the complete combustion of #8.50*10^3# #g# of methane?

How do you evaluate the expression #((3x+x)/y)# when #x=4# and #y=2#?

Question #52b92

How can we identify dependent variables?

What is the equation for finding the equilibrium constant for a chemical reaction?

How can I calculate the moles of a solute?

Question #e293b

How do you calculate entropy change?

How do you calculate mole fraction of solute?

How does heat affect the phases of matter?

What is x if #4x+3/x9=5#?

How do you simplify the expression #3xx+4#?

What is the product of #3/5xx5/12#?

How do you calculate mole fractions?

What is the total number of oxygen atoms on the lefthand side of #2Ca_2(PO_4)_2(s) + 4SiO_2(s) + 12C(s) > 4CaSiO_3(s) + P_4(s) + 12CO(g)#?

How does mass number relate to the particles in the atom?

How would you calculate the molar mass of water?

What is the correct formula of an ionic compound containing Fe2 and PO43 and how is it called?

If you have 21 moles of gas held at a pressure of 78 ATM and a temperature of 900 k, what is the volume of the gas?

How do you simplify #6 + (x  5) + 7#?

What are some examples of ionic formulas?

A sample of O2 under 2.00 atm occupies 500 ml at 25.0˚C. What pressure will the sample have at 0.0˚C ?

How can I write the formula for calcium nitride?

If the half life of an unstable element is 5000 years, what percentage of the parent material will be left after 10000 Years?

Question #5bc49

How many moles are present in 1.21 X 10^24 molecules of HBr?

Oxygen gas is at a temperature of 40°C when it occupies a volume of 2.3 liters. To what temperature should it be raised to occupy a volume of 6.5 liters?

Question #b7af7

How can the formation of a solution be exothermic or endothermic?

How many moles are in 45.0 sample of #MgO#?

Why the total mass of reactants and of product not change in a chemical reaction?