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What is the relative molecular mass of ammonia?

Ammonia is NH 3 . Nitrogen has a relative atomic mass of 14. Hydrogen has a relative atomic mass of 1. 14 + (3 x 1) = 17 Ammonia has a relative molecular mass of 17.
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Answered by Adam C. • Chemistry tutor
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How do I write an introduction

A good introduction will simultaneously outline the argument your essay will take and acknowledge the question. Your individual take on the question should be apparent from the introduction e.g. whether you ...
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Answered by Katie P. • English tutor
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Shape S is one quarter of a solid sphere. The volume of S is 576(pi)cm(^3). Find the surface area of S correct to 3 significant figures

Radius is the only property of a sphere that is used to define surface areas and volumes. We need to find what the radius is from the information that the question has given us. S is a quarter sphere, and we...
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Answered by Joe W. • Maths tutor
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Factorise X^2 + 13x + 42; from this, please give the answer to X^2 + 13x + 42 = 0

This question aims to look at quadratic equations. We factorise Quadratic equations into two sets of bracketsFirst, we are dealing with X 2 . X 2 is formed from X multipled by X, so each bracket should conta...
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Answered by Khalid A. • Maths tutor
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An ice cube with a small iron ball in its centre is placed in a cup of water. 3.9 x 10-3kg of water in the cup is displaced and the volume of the ice cube is 4.0 x 10-6m3. Ice density: 1000 kg m-3 Iron density: 7800 kg m-3, what is the volume of the iron?

Firstly you need to know that the weight/mass of water displaced by the cube is equal to the weight/mass of the ice cube: 3.9 x 10 -3 kg You then need to recognise that the weight of the cube is the weight o...
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Answered by Adam C. • Physics tutor
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