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Chemistry

2 answers:

siniylev [52]3 years ago

5 0

Answer: :))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))

Explanation:

tatuchka [14]3 years ago

4 0

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Calculate the mass of 0.00456 moles of (NH4)2SO4

Anna [14]

To find the mass you need to find the weight of a mol of the molecules by adding up the atomic mass.

N = 14.007 g/mol
H = 1.008 g/mol
S = 32.065 g/mol
O = 16 g/mol

2(14.007) + 8(1.008) + 32.065 + 4(16) = 132.143 g/mol

Now you know how much an entire mol weight you multiply it by how much you actually have

0.00456 * 132.143 = 0.603 g

7 0

3 years ago

Two solid blocks are HEATED to the temperatures show. The blocks are placed so they touch. Which diagram shows the DIRECTION HEA

Setler [38]

Answer:

Heat flows from the block at high temperature to the one with lower temperature

Explanation:

The direction of heat flow is from a body at higher temperature to one with a lower temperature.

Temperature gradient determines the way and manner in which heat is dissipated.
As a system tend to increase entropy, it ensures that heat moves from hotter body to a colder body.
Heat movement here is by conduction as the body touches.
When both bodies reaches the same temperature, thermal equilibrium is established.

7 0

3 years ago

An atom of boron has an atomic number of 5 and an atomic mass of 11. The atom contains

Liono4ka [1.6K]

Answer:

5 protons, 5 electrons, and 6 neutrons

3 0

3 years ago

Use the chemical reaction: 2Mg + O2 > 2MgO to answer the question below.

Arturiano [62]

10 mols of MgO will form

5 0

2 years ago

A compound is 40.0% c, 6.70% h, and 53.3% o by mass. assume that we have a 100.-g sample of this compound. the molecular formula

atroni [7]

When you have 100 g of compound, then based on the percentages given, there are 40.0 g C, 6.70 g H, and 53.3 g O. Convert those to moles:

C: 40.0 g / 12.0 = 3.33 moles of C
H: 6.70 g / 1.01 = 6.63 moles of H 
O: 53.3 / 16.0 = 3.33 moles of O

Dividing by the smallest (3.33), we get a C:H:O mole ratio of 1:2:1
So, The empirical formula is CH2O.
Now, That formula has a molar mass of [12.0 + 2(1.0) + 16.0] = 30.0

And we are given it's molar mass is = 240

So, no. of units of CH2O = 240 / 30 = 8

8 x CH2O = C8H16O8, and that is the molecular formula.

$C_8H_{16}O_8$

3 0

3 years ago