Answer:
Option D (191 grams) is correct
Explanation:
Step 1: Data given
Atomic mass of Mg = 24.3 g/mol
Atomic mass of Cl = 35.45 g/mol
Atomic mass of O = 16.0 g/mol
Step 2: Calculate molar mass of Mg(ClO3)2
In 1 molecule Mg(ClO3)2 we have 1x Mg, 2x Cl and 6x O
Molar mass Mg(ClO3)2 = atomic mass of Mg + atomic mass of (2*Cl) + atomic mass of (6x O)
Molar mass Mg(ClO3)2 = 24.3 g/mol + 2*35.45 g/mol + 6* 16.0 g/mol
Molar mass Mg(ClO3)2 = 191.2 g/mol
The molar mass of Mg(ClO3)2 is 191 g/mol
This means 1 mol has a mass of 191 grams
Option D (191 grams) is correct
Answer:
λ = 0.85×10³⁰ m
Explanation:
Wavelength of radiation = ?
Frequency of radiation = 3.52×10⁻²² Hz
Solution:
Formula:
c = f × λ
c = speed of wave = 3×10⁸ m/s
by putting values,
3×10⁸ m/s = 3.52×10⁻²² Hz × λ
λ = 3×10⁸ m/s / 3.52×10⁻²² s⁻¹
λ = 0.85×10³⁰ m
Explanation:
H2So4=sulphuric acid , strong acid
Answer:
A major function of the Endomembrane system is
The endomembrane system (endo- = “within”) is a group of membranes and organelles in eukaryotic cells that works together to modify, package, and transport lipids and proteins.
Explanation:
The endomembrane system (endo = “within”) is a group of membranes and organelles (Figure 4.4. 1) in eukaryotic cells that works together to modify, package, and transport lipids and proteins. The endomembrane system is a series of compartments that work together to package, label, and ship proteins and molecules. In your cells, the endomembrane system is made up of both the endoplasmic reticulum and the Golgi apparatus. These compartments are folds of membranes that form tubes and sacs in your cells.
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Well, clearly the calculated value for the number of hydrating water molecules would increase above its true level, because the total weight loss would be greater than expected. This is of course undesirable, but may usually be avoided by careful application of the experimental procedures. The signs to look for include
<span>(a) loss of water of hydration usually occurs at a considerably lower temperature than decomposition of the salt, because the water molecules are not strongly bonded in the hydrated complex. Dehydration typically occurs in a broad range of temperatures, typically from 50°C to around 200°C, whereas decomposition of the dehydrated salt generally takes place at temperatures over 200°C and in some case over 1000°C. So dehydration should be performed with care - avoid over-heating the sample in order to ensure that all the water has been driven off. </span>
<span>(b) dehydration often results in a change of appearance of the sample, particularly the colour and particle size of crystalline hydrates. However, decomposition may be accompanied by an additional change at higher temperatures, which gives a warning of its occurrence. </span>
<span>(c) if it is suspected that decomposition is occurring, or that dehydration is not complete, exploratory runs of varying duration at a given temperature may be carried out. There are two criteria to judge the effectiveness of the procedure </span>
<span>(i) the weight of the sample decreases to a constant stable value: this is a sign that dehydration is complete and decomposition - which is usually a much slower process - is not occurring. </span>
<span>(ii) the calculated number of molecules of water lost should take an integer value. If it differs by more than, say, 0.1 from an integer than it is probable that one of these two undesirable effects is present. Some hydrates lose water in steps through intermediate compounds with a lower level of hydration. These may provide plateaus where the weight loss is stable but dehydration is not complete. These will, in general, not provide an integer value for the number of water molecules present (because the calculation is based on the assumption that the residual sample is completely dehydrated salt).</span>