Answer:
C. natural gas
Explanation:
Solar comes from the sun, which if it became nonrenewable, we would be dead. hydroelectric comes from water and Dams, which water is reproduced through rain. Biomass are things like leaves, which are seasonally reproduced.
Answer:
C. 70%
Explanation:
Atomic Mass of the silicon = 28 g.
Atomic mass of the Carbon = 12 g.
Total mass of the Silicon Carbide = 28 + 12
= 40 g.
Now, Using the formula.
% Composition = Mass of the silicon/Total mass of the compound × 100 %
= 28/40 × 100 %
= 70 %
Hence, % composition of the silicon in SiC is 70%
Answer:- 537 kJ of heat is released.
Solution:- For the given equation, 
is -657 kJ and the coefficient of 
in the balanced equation is 2. It means 657 kJ of heat is released when 2 moles of chlorine are used. We need to calculate the heat released when 116 g of are used.
Grams of chlorine are converted to moles and then multiplied by the value and divided by the coefficient of chlorine and the set could be shown using dimensional analysis as:
= 537.46 kJ
If we use the correct sig figs then it needs to be round off to three sig figs as the given grams of chlorine has only three sig figs. So, 537 kJ of heat is released.
Answer:
Explanation:
Mass percent is defined as the mass of an element divided by the sum of masses of all the elements multiplied by 100. It is generally used to define the concentration. It does not depend on concentration.
It is given as;
Mass percent = (mass of an element / Total mass of the compound ) × 100
Mass of compound (alloy) = 78.2 g copper + 103.5 g zinc +2.8 g lead = 184.5 g
(a) Cu
Mass of Cu = 78.2
Mass percent = (78.2 / 184.5) * 100 = 42.38%
(a) Zn
Mass of Zn = 103.5
Mass percent = (103.5 / 184.5) * 100 = 56.10%
(c) Pb
Mass of Pb = 2.8
Mass percent = (2.8 / 184.5) * 100 = 1.52%
Answer:
please put the full question
Explanation:
