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2 years ago

Please help me with this answer correct

Chemistry

2 answers:

IRINA_888 [86]2 years ago

8 0

Trust in God and he will guide you throughout life, trust me without God life sucks and is meaningless! Jesus was there for you when other hurt and abandoned you he was with you comforting you, don’t neglect him trust and love him! Repent of your sins and live by the Bible!

oksano4ka [1.4K]2 years ago

5 0

Answer:

hope this helps :)

Explanation:

for the first one, you can look at the periodic table and look at the atomic number and it will show you how many protons there are giving you the answer because protons and electrons are equal in a pure element

a- carbon

b- neon

c- boron

d- oxygen

e- helium

f- hydrogen

g- lithium

h- beryllium

i- nitrogen

1- sulfur

2- S

3- 16

4- 32.066

5- 16

6- 16

7- 16.066

8- draw circles and put 16 dots like on the other page and in the middle put 16 nuetrons and electrons

9- 6 i think

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2 years ago

How much calcium can be recovered from 75.0g of calcium fluoride

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38.46g

Explanation:

Given parameters:

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Unknown:

Mass of calcium that can be recovered = ?

Solution:

This is a mass percentage problem and we need to solve it accordingly.

To solve this problem;

Find the molar mass of CaF₂

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2 years ago

The chart shows the voltage of four electric currents.

masha68 [24]

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$V=IR$

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2 years ago

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3 years ago

A chemist prepares a solution of calcium sulfate (CaSO_4) by measuring out 0.0101 g of calcium sulfate into a 350. mL volumetric

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Answer:

2.123x10⁻⁴ M (mol/L)

Explanation:

First, we are considering the molar mass for each element, a data we obtain from the periodic table:

Ca= 40

S= 32

O= 16

Then, for CaSO₄, the molecular mass is 136 g per mol

As we dissolve 0.00101 g of this salt, we are going to convert this mass in moles units:

1 mol CaSO₄=136 g → 0.0101 g=7.43x10⁻⁵ mol

We finally obtain the concentration for the 350 ml, having in mind that it should be in mol/L:

350ml=7.43x10⁻⁵ mol

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3 years ago