Ag because it is solid at STP and others are gas and liquids.
Answer: The balanced equation is
Au(s) + 3HNO3(aq) + 4HCl(aq) ---> HAuCl4(aq) + 3NO2(g) +3H2O(l)
The function of HCl in a solution of Aqua regia, that is used to dissolve gold is to dissolve other metals like quartz or iron stone that surround the gold.
Explanation: To balance the equation, we check the ratio of each element in the reacting side and the product side ( left and right hand side). Let their ratio be equal be adding moles to the compound of the element or the element it's self in either side of the equation.
HCl which is called hydrochloric acid, is an acid that does not react with gold, but it react with every other substance, like your skin, metals etc. it is used to clean a gold, by dipping the gold inside it, all the metals on the surface of the gold will dissolve.
When dissolving a gold in aqua regia solution, HCL is added to prepare this solution because it will help to dissolve all other substance on the surface of the gold.
<span>when a gas is collected over water at 30.0 deg C , the H2O vapor pressure is 32 Torr
Part A:What is the partial pressure of the hydrogen gas collected in this way?
at a total pressure of 732 mm Hg. - 32 Torr H2O vapor = 700. Torr H2
your answer is
answer is 700 mm Hg.
Part B:
If the total volume of gas collected is 724 mL, what mass of hydrogen gas is collected?
find moles
PV = nRT
(700.Torr)(0.724 Litres) = n (62.36 Torr-Litres/mol-K) (303 Kelvin)
n = 0.02682 moles of H2
using molar mass, find moles:
( 0.02682 moles of H2) (2.016 grams H2 / mol) = 0.05407 grams of H2
your answer rounded to 3 sig figs is
0.0541 grams of H2</span>
Explanation: Nickel atoms<span> have 28 protons in their </span>atomic nuclei<span>, giving </span>nickel<span> the</span>atomic<span> number 28. In addition to 28 protons, a </span>nickel atomic nucleus<span> contains 30 to 36 neutrons, depending on the isotope. ... The </span>atomic nuclei<span> of </span>copper<span> also include 34 to 37 neutrons, depending on the isotope.</span>