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Calculate the atom economy of the following equation, assuming that KNO3 is the desired product. KOH + HNO3 ---> KNO3 + H2O (Mr of reactants and products, KOH - 56.1, HNO3 - 63.0, KNO3 - 101.1, H2O - 18.0)

Answer: 84.9% The equation for calculating the atom economy is = (Mr of desired product / total Mr of products) x 100 or = (Mr of desired product / total Mr of reactants) x 100 as the total Mr of the prod...

Answered by Manon S. • Chemistry tutor

4390 Views

Express (16x^2 + 4x^3)/(x^3 + 2x^2 - 8x) + 12x/(x-2) as one fraction in its simplest form.

Answer: 16x/(x - 2)

Start with the numerator of the first fraction, 16x² + 4x³ , take a factor of 4x² out to get 4x²(4 + x). Then look at the denominator...

Answered by Manon S. • Maths tutor

3206 Views

In a bag of 25 coloured balls, 7 are orange, 6 are yellow and the rest are green. Laura picks out a ball and records its colour but doesn't return it to the bag, she then repeats this twice more. What is the probability of Laura getting 3 yellow balls?

Answer: 1/115

The easiest way to solve this problem is to draw part of a tree diagram to see the probabilites of each colour being picked each time Laura pulls a ball out of the bag (a full diagram...

Answered by Manon S. • Maths tutor

2909 Views

Briefly describe the Italian subjunctive mood.

In Italian, the subjunctive mood is widely used and expresses uncertainty, doubt and possibility. Moreover, it can be used to convey emotions such as desire. Hence, the subjunctive mood conveys the opposi...

Answered by Francesco Paolo B. • Italian tutor

1742 Views

What is the structure of the US government?

The US government is broken into 3 branches: The execuive, the legislator and the judicary, also respectivey known as the president and cabinet, congress and the supreme court. Each branch is seperate fro...

Answered by Isini A. • Government and Politics tutor

3298 Views