3 years ago

:( Write out the equation for combustion of solid calcium and balance the equation

Chemistry

2 answers:

Gennadij [26K]3 years ago

6 0

Use Socratic for the answer hope it hlo elf

topjm [15]3 years ago

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Umm i need Brainlyest bad right now so if you are very kind you will help me

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A mixture of two or more kinds of molecules, evenly dispersed would be a(n)

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If you mix equal concentrations of reactants and products, will the reaction proceed to the right or the left? HF(aq)+NO3−(aq)⇌H

kaheart [24]

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hypompast

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Balance the nuclear reaction equation for the beta minus decay of nickel-63 by completing the missing numbers.

Marta_Voda [28]

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3 years ago

1. A sample of polystyrene is found to have a number-average molar mass of 89,440 g mol−1 . Neglecting contributions from end gr

Snowcat [4.5K]

Answer:

The weight-average molar mass of polystyrene is 134,160 g/mol.

Explanation:

Molar mass of the monomer styrene , $C_8H_8$ , M=104 g/mol

Given , number average molar mass of the polymer , M'= 89,440 g/mol

Degree of polymerization = n

$n=\frac{M'}{M}=\frac{89,440 g/mol}{104 g/mol}=860$

The weight-average molar mass = $M_{avg}=?$

Molar mass dispersity is ratio of weight-average molar mass to the number average molar mass of the polymer.

$\text{Molar mass dispersity}=\frac{M_{avg}}{M'}$

$1.5=\frac{M_{avg}}{89,440 g/mol}$

$M_{avg}=89,440 g/mol\times 1.5 = 134,160 g/mol$

The weight-average molar mass of polystyrene is 134,160 g/mol.

8 0

3 years ago