Calculating weight percentage

Table 7 shows the calculated weight percent of calcium carbonate and titanium dioxide in the white-colored paint sample. These levels are based on the calcium and titanium levels shown in Table 6. Calcium carbonate was evident by the FTIR spectrum acquired from the dried paint sample, shown in Figure 13. (Flad it been available, Raman spectroscopy, which gives ready access to the low wavenumber region, could have been used to confirm the presence (and polymorphic form) of titanium dioxide [4].) Given the white color of the paint, it is likely that the titanium present was present as titanium dioxide, and this was assumed in the calculations. The calculated weight percentage of calcium carbonate in the dried paint is 21.7 wt%, and 12.6 wt% in the paint containing the solvents. The titanium dioxide levels were calculated to be 30.6 and 17.7 wt% in the dried and solvent-containing paint sample, respectively.

Table II. Comparison of Observed and Calculated Weight Percentages for DCB, TRCB, TCB, and PHHCB in Sediments in the Upper Portion of Lake Hartwell...

Figure 14 Fluxes and composition of particulate organic carbon in the equatorial Pacific Ocean, (a) POC fluxes (mgm d ). (b) Corresponding fractions of amino acid, carbohydrate, lipid, and molecularly uncharacterized carbon (biochemical class-carbon as a percentage of total OC) in plankton, sediment traps (105 m, l,000m, >3,500 m) and surface sediment samples. The fraction of molecularly uncharacterized organic carbon (calculated as the difference between total OC and the sum of amino acid - - carbohydrate - - Upid) increases with more extensive degradation to become the major constituent in deeper POC samples (after Wakeham et al., 1997). (c) Calculated weight percentages of amino acid, carbohydrate, and lipid in plankton and in sinking (sediment trap) particles in the upper and lower water column as determined by solid-state C-NMR spectroscopy (source Hedges et al., 2001).

The calculated weight percentages of the liquid phases observed at equilibrium provide further insight into the observed crystallization patterns. As shown in Fig. 11-18, the data suggest a direct correlation between the presence of a liquid phase during the freeze crystallization stage and the degree of... 

Coal analyses are reported on severalbases, and it is customaiy to select the basis best suited to the application. The as-received basis represents the weight percentage of each constituent in the sample as received in the laboratoiy. The sample itself may be coal as fired, as mined, or as prepared for a particular use. The moisture-free (diy) basis is generally the most useful basis because performance calculations can be easily corrected for the ac tual moisture content at the point of use. The dry, ash-free basis is frequently used to approximate... 

Calculate the weight percentage of acetic acid in the vinegar. The vinegar has a density of 1.0 g/mL. 

When weight of any mixture of solids and the amount of active ingredient in that mixture are known, one can calculate the percentage strength of active ingredient (% w/w) by the method of proportion. These calculations are explained best by following Examples 2 and 3. 

Calculations From the chromatograms obtained and taking into account any water detectable in solution (1), calculate the percentage of water taking 0.9972 g as its weight per ml at 20 °C. 

Calculations Calculate the percentage w/w of chloroform, taking into consideration 1.48 as the weight per ml at 20 °C. 

The weight percentage of each component or set of components designated C may be calculated from their respective peak areas A ... 

UV absorbance detector, it is noted that the calibration constants for TGMDA and DDS are quite similar and that the 1-1 product has a different constant which is essentially identical to those of the higher MW products. For components having retention times less than 30 min, their total weight percentage may be calculated from the sum of area segments Aj between 28 and 32 min taken at 0.1 min intervals i.e.,... 

Problem 7 Listed in the following chart are the atomic weights (measured in atomic mass units) for natural silver and its two isotopes. Use this data to calculate the percentage of silver-109 in the natural mixture. 

Poly(vinyl acetate) of number-average molecular weight 100,000 is hydrolyzed to poly(vinyl alcohol). Oxidation of the latter with periodic acid to cleave 1,2-diol linkages yields a poly(vinyl alcohol) with Xn = 200. Calculate the percentages of head-to-tail and head-to-head linkages in the poly(vinyl acetate). 

According to MS data, HCl does not evolve at any temperature studied. The weight loss due to the thermal treatment at 200°C was 39%. According to our calculation, this percentage corresponds to the elimination of 94% of the theoretically pos-... 

---