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2 years ago

A chemical reaction gives off 2100 kg of heat energy how many calories

Chemistry

1 answer:

dlinn [17]2 years ago

7 0

The chemical reaction that gives off 2100 Kg of heat energy has 501.9126 calories

calculation

convert KJ to calories

that is

1 KJ = 0.239006 calories

2100KJ= ? calories

by close multiplication

= (2100 kj x 0.239006)÷ 1 kj =501.9126 calories

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Solid cesium bromide has the same kind of crystal structure as CsCl which is pictured below: If the edge length of the unit cell

Oxana [17]

Answer:

$\mathbf {density \ d =4.4845 \ g/cm^3}$

Explanation:

Let recall the crystal structure of CsBr obtains a BCC structure. In a BCC structure, there exist only two atom per cell.

The density d of CsBr in g/cm³ can be calculated by using the formula:

$\mathtt{ density \ d = \dfrac{z \times molar\ mass \ (M)}{ edge \ length \ (a) \ \times avogadro's \ number \ (N)}}$

where;

z = 1 mole of CsBr

edge length = 428.7 pm = (4.287 × 10⁻⁸)³ cm

molar mass of CsBr = 212.81 g/mol

avogadro's number = 6.023 × 10²³

$\mathtt{ density \ d = \dfrac{1 \times 212.81}{(4.287 \times 10^{-8})^3 \times 6.023 \times 10^{23}}}$

$\mathtt{ density \ d = \dfrac{ 212.81}{47.4540533}}$

$\mathbf {density \ d =4.4845 \ g/cm^3}$

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3 years ago

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NNADVOKAT [17]

Answer: 5622.6g

Explanation:

Note: Kf for water is 1.86°C/m.

The simple calculation is in the attachment below.

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