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Demonstrating the low melting point of Gallium metal (29.8°C), an instructor removes a 1.00 kg sample of the metal from a container at room temperature (20.0°C) and places it onto the palm of his hand. Given the heat of fusion and specific heat of this metal is 80.18 kJ/kg and 373 J/kg°C, respectively, determine the amount of thermal energy absorbed by the sample before reaching thermal equilibrium with the instructor's hand (37.0°C). Assume the specific heat of gallium does not change from the solid state to the liquid state.
what solution will have the lowest boiling point?
What is the ratio of HCO3- to H2CO3 in an exhausted marathon runner whose blood pH is 7.1? Note: There is no need to consider the Ka2, use only the Ka1.
What wold you prodict for the relative reactivity of 4-trifluoromehylbenzaldehyde in this aldol condensation reaction.
what is the lowest concentration that can be measured with your spectrophotometer? For compound Y, which absorbs much more light at the same wavelength (a molar absorptivity of 30,000), what is the lowest concentration that can be measured?
Ozone,O3 , is destroyed when ClO levels are high. ClO is likely formed from the decomposition of chlorofluorocarbons (CFCs) in sunlight. Standard enthalpies of formation for selected substances are given in the table below.
Determine K for the reaction, H2C2O4(aq) + 2 OH-(aq) C2O42-(aq) + 2 H2O(l) given that, for H2C2O4(aq), Ka1 = 6.5 x 10-2 and Ka2 = 6.1 x 10-5. Don't forget that Kw = 1 x 10-14.
Ammonium hydrogen sulfide decomposes according to the following reaction, for which Kp = 0.451 at a given temperature. If 55.0 g of NH4HS is sealed inside a 5.00 L container at this temperature, calculate the partial pressure of NH3(g) at equilibr..
A human piece of pottery is dated 16750 years old by using carbon-14. how many half lives have passed since the pottery was made?
A container is filled with CO2(g) and heated to 1000K. The gas pressure at this temperature is 0.50 atm. Graphite (C) is then added to the container and some of the CO2 is converted to CO according to the reaction below
10.00mL aliquots of an unknown containing element X was mixed with aliquots of a standard solution of element X for atomic absorption. The standard solution contained 1786.50ug X/mL.
The rate constant for the equation 2C2F4 --> C4F8 is 0.0438 M?1· s?1. We start with 0.142 mol C2F4 in a 5.00-liter container, with no C4F8 initially present. What will be the concentration of C2F4 after 1.00 hour
given the pk for acetic acid is 4.76. suppose that we dissolve a mole of this weak acid in 10l of water. find the ph of
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