Answer:
0.136g
Explanation:
A student dissolved 5.00 g of Co(NO3)2 in enough water to make 100. mL of stock solution. He took 4.00 mL of the stock solution and then diluted it with water to give 275. mL of a final solution. How many grams of NO3- ion are there in the final solution?
Initial mole of Co(NO3)2 
Mole of Co(NO3)2 in final solution
Mole of NO3- in final solution = 2 x Mole of Co(NO3)2
Mass of NO3- in final solution is mole x Molar mass of NO3
Answer is: B) The kinetic energy is increasing proportional to the mass of the bowling ball.
Kinetic energy has to do with the speed of an object and how much mass it has; basically how the object is moving.
Ek = 1/2 · m(bowling ball) · v²(bowling ball).
m is mass; v is speed of bowling ball.
The standard unit of kinetic energy is the joule.
You have 45 kJ of heat added and for every 40.6 kJ added, one mole is able to be vaporized. Find how many moles you can vaporize.
45 kJ / 40.6 kJ = 1.1 moles
Water is roughly 18 g per mole so 1.1 moles x 18 g per mol = 19.95 grams vaporized
Hope I helped!
I'm not going toblie I'm stuck with A and B.
But to me my gut says A
<span><HTML><META HTTP-EQUIV="content-type" CONTENT="text/html;charset=utf-8">
<p class="answer-detail Fw-n" id="yui_3_17_2_3_1463589225479_1149"><SPAN class="ya-q-full-text"
id="yui_3_17_2_3_1463589225479_1148" itemprop="text">K = 273.15 + C <BR><BR>K =
172 so substitute <BR><BR> 172 = 273.15 + C <BR><BR> C = 172 - 273.15 =
-101.15</SPAN> </DIV></span>
