First let's find how much 30Si in nature: 100%-92.2%-4.67%=3.13%
Average M = M(28Si) * 0.922 + M(29Si) * 0.0467 + M(30Si) * 0.0313;
Let's substitute all the values we know:
28.09 = 27.98*0.922 + 28.98*0.0467 +x * 0.0313;
x = 30.03 g/mol
Do you have choices??????????????????
If heat is transferred from an object to the surroundings, then the object can cool down and the surroundings can warm up. When heat is transferred to an object by its surroundings, then the object can warm up and the surroundings can cool down.
Answer: -
37.5 g of NaCl are in 250 g of a 15.0% (by weight) solution.
Explanation: -
Total mass = 250 g
Percentage of NaCl = 15.0 %
=
Thus =
Number of grams of NaCl present =
= 37.5 g
Answer:
CO(g) + H2(g) + H2O(g) ==> CO2(g) + 2H2(g)
Explanation:
In the industry, hydrogen is prepared from water and hydrocarbons. Water gas being the major method of preparation of hydrogen industrially.
The water-gas reaction is an industrial process in which steam is passed over red-hot coke giving a gaseous mixture of carbon monoxide and hydrogen:
C + H2O(g) → CO + H2.
The mixture of CO and H2 is Futher passed through steam according to the equation:
CO(g) + H2(g) + H2O(g) ==> CO2(g) + 2H2(g) to give hydrogen and carbon dioxide.