Read the Solubility Rules and answer the Question you see in the pic: Solubility Rules
Compounds containing group 1 alkali metals or ammonium (NH4+) are soluble.

Nitrates (NO3−), chlorates (ClO3−), perchlorates (ClO4−), and acetates (C2H3O2−) are soluble.

Chlorides (Cl−), bromides (Br−), and iodides (I−) are soluble, except for compounds containing silver (Ag+), mercury(I) (Hg22+), and lead (Pb2+).

Sulfates (SO42−) are soluble, except for compounds containing calcium (Ca2+), strontium (Sr2+), barium (Ba2+), and lead (Pb2+).

Hydroxides (OH−), carbonates (CO32−), and phosphates (PO43−) are insoluble, except for compounds containing group 1 alkali metals and ammonium (NH4+).

Sulfides (S2−) are insoluble, except for compounds containing group 1 alkali metals, ammonium (NH4+), magnesium (Mg2+), calcium (Ca2+), strontium (Sr2+), and barium (Ba2+).

You would do 1500/4 and the answer is 375

Hope the image of the frequency formula

The answer to the question: choose the correct statement.  a) when ethane reacts with fluorine gas the product is less stable.b) addition reactions of unsaturated hydrocarbons and halogens requires a high activation energy.  c)the double covalent bond within unsaturated hydrocarbons requires a lot of energy to break.  d)the double covalent bond within unsaturated hydrocarbons can be broken easily.is: a) when ethane reacts with fluorine gas the product is less stable.

Use the universal gas law formula: pv = nrt now, the key word in this problem is stp, so at stp, temperature will always be 0 degrees celsius and pressure will always be 1.0 atm or 760 torr. given something is at stp, we already know the two variables pressure and temperature. the other thing we can find with the given information is moles. to find moles, just divide grams by molar mass of the element. 16.0g / 2(16.00)g/mol = 0.5 moles plug the values in to the equation pv = nrt (1.0 atm)( x ) = (0.5 )(0+273=273k) the r value is just a constant for when we use atm, liters, moles and kelvin. i'm assuming you want your answer in liters, but if you dont just move the decimal 3 to the right in your final answer. so when plugging these numbers in to your calculator and trying to find x, you get 11.20665 liters using significant figures the answer is 11.2 liters