Answer:
2.5 mcg of iron
Explanation:
Density is given as;
D= m/v
Where;
m= mass
v= volume
mass= ?
volume= 6.5 ml or 0.065 dl
d= 39 mcg/dL
m= density × volume
m= 39 mcg/dL × 0.065 dl
m= 2.5 mcg of iron
Answer:
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1) mass= M×V(L)×molar mass
Mass=1.57 × 0.025×40.0
<u>= 1.57 g</u>
2) M1V1 = M2V2
0.80×31.5=50.0 × M
<u>M = 0.540 M
</u>
3) M1V1 = M2V2
1.10 × V= 0.0275×1000
<u>V = 25.0 mL</u>
Answer is: humus.
Humus is the dark organic matter that forms in soil when dead plant and animal matter decays.
Microorganisms decompose the soil organic matter into inorganic minerals that the roots can absorb.
Humus can hold a lot of moisture (approximately 80–90% of its weight) and its dark color helps to warm cold soils.
Zn(NO3)2 readily dissolves in water to form Zn2+ and 2NO3 ions. That makes it a strong electrolyte.
Answer:
True
Explanation:
The arrangement of three groups COOH, CO, OH in the order of reducing boiling point is as follow -
COOH > OH > CO
COOH gets strongly polarised due to the presence of electron withdrawing carboxy group and hence have strong H+ bonds as compared to that of alcohol.
Hence the given statement is true.