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16.4 g of Ca(OH)2 was reacted with HCl in a reaction. What was the expected mass of CaCl2, given the mass of the reactant Ca(OH)2 was 12.6 g? What is the percentage yield of the reaction? ( Give all answers to 3 significant figures)

Ca(OH)₂:Mass = 12.6 g Molar mass= 40.1 + (16 x 2) + (1 x 2) = 74.1 g/molMoles = Mass / Molar mass = 12.6 g / 74.1 g/mol = 0.17 molThe molar ratio is 1:1 of Ca(OH)₂ : CaCl₂...

Answered by Yogietha K. • Chemistry tutor

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Explain how Descartes argues that we can gain a priori knowledge through intuition and deduction

I will begin by considering what apriori knowledge and then intuition and deduction are. On the basis of this I will explain how Descartes argues we can gain a priori knowledge through intuition and deduc...

Answered by Sophie R. • Philosophy tutor

16076 Views

Given a list of N numbers, use a single list comprehension to produce a new list that only contains those values that are: (a) even numbers, and (b) from elements in the original list that had even indices .

A simple solution to this problem would be as follows [x for x in list[::2] if x%2 == 0] For example, given the following list: list = [ 1 , 3 , 5 , 8 , 10 , 13 , 18 , 36 , 78 ] The list comprehension [x ...

Answered by Waseem A. • Python tutor

2770 Views

Explain what is in one molecule of Sodium sulphide (Na2SO4)

The Na2 tells us there are 2 sodium atoms present, The S tells us there is one Sulphur atom presentThe O4 tells us there are four oxygen atoms presentTherefore, each molecule of Sodium Sulphide contains, ...

Answered by Jamie M. • Chemistry tutor

1864 Views

If a person weighs 400N and the total area of their feet is 120cm^2, what is the pressure they are exerting on the ground?

The formula for pressure is Pressure = Force / AreaIf the force is 400N and the area is 120 cm², the pressure is equal to 400/120, which is 3.33 N/cm²

Answered by Jamie M. • Physics tutor

1446 Views