Chemistry, 30.08.2019 23:40 cupcakes5335

What is the specific heat of a substance if 17.0 grams of the substance require 0.52 kilojoules of heat to change the temperature by 3.6 degrees celsius?

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First, the standard way to measure heat is in Joules, so convert kJ to J by multiplying by 1000 (since there are 1000 kilojoules in one Joule). This gives you 520J. Next, you will need the following formula: Q = m × C × ΔT, where Q is heat, m is mass, C is specific heat, and ΔT is change in temperature. Plug in all the values given and solve algebraically for C, the specific heat!
(520) = (17.0)(C)(3.6)
520 = (61.2)(C)
8.5 = C
Remember sig figs! In the question, the value with the lowest number of significant figures has two, so your answer must have two! Also, remember units! Specific heat is measure in J/g•⁰C. So, the answer is 8.5 J/g•⁰C. Hope that helps!

Answer from: Quest

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

Answer from: Quest

"you start with 15.67 g mgco3-xh2o, when heated and all the water is removed, you are left with 7.58 g mgco3 only.

therefore, you had 15.67 - 7.58 = 8.09g h2o

moles of each :

7.58g mgco3 = ? moles = 7.58g / 83.4g/mole = 0.09moles

8 09g h2o = ? moles = 8.09g / 18g/mole = 0.44moles

molar ratio between the two by dividing both numbers by the smallest number :

0.09 / 0.09 = 1

0.44 / 0.09 = 4.8

mgco3-5h2o"

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